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19-1506; Rev 1; 10/99
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
General Description
The MAX2651/MAX2652/MAX2653 silicon germanium (SiGe), low-noise amplifiers (LNAs) are intended for use in GSM900, DCS1800, and PCS1900 band wireless handsets. The MAX2651/MAX2652 consist of two LNAs, one optimized for the GSM900 band and the other optimized for the DCS1800/PCS1900 bands. They feature a band-select pin to switch between the two LNAs, as well as a gain-step input to reduce the gain of each LNA by 20dB and reduce supply current. The MAX2652 is functionally equivalent to the MAX2651, but features a lowpower shutdown mode. The MAX2653 consists of a single LNA optimized for the DCS1800 and PCS1900 bands, and has a shutdown feature and a 20dB gain step. The MAX2652 and MAX2653 together form an ideal solution for triple-band phone applications (GSM, DCS, and PCS bands). The MAX2651/MAX2652/MAX2653 are fabricated using an advanced high-frequency SiGe bipolar process. As a result, all devices provide low noise figure, high gain, and high input third-order intercept point (IP3) performance at the GSM, DCS, and PCS bands. A pull-up resistor to V CC at each LNA output allows for gain adjustability. A minimal number of external components are needed for input and output matching, helping to reduce board space. The MAX2651/MAX2652 are packaged in a 10-pin MAX, while the MAX2653 is packaged in an 8-pin MAX. All devices operate from a single +2.7V to +3.3V supply.
Features
o Wide Operating Frequency Range 800MHz to 1000MHz (MAX2651/52) 1800MHz to 2000MHz (MAX2651/52/53) o Excellent Low-Noise Performance 1.2dB/1.3dB over GSM Receive Band (MAX2651/52) 1.8dB/1.8dB/1.7dB over DCS Receive Band (MAX2651/52/53) o High Gain 18dB over GSM Receive Band (MAX2651/52) 18dB/17.5dB/18.5dB over DCS Receive Band (MAX2651/52/53) o 20dB Gain Reduction in Low-Gain Mode o Externally Adjustable Gain o +2.7V to +3.3V Single-Supply Operation o Low Supply Current 5.4mA to 7.0mA in High-Gain Mode 2.2mA in Low-Gain Mode o 0.25A Shutdown Current (MAX2652/53)
MAX2651/MAX2652/MAX2653
Ordering Information
PART MAX2651EUB MAX2652EUB MAX2653EUA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 10 MAX 10 MAX 8 MAX
Applications
GSM900/DCS1800 Dual-Band Phones GSM900/DCS1800/PCS1900 Triple-Band Phones DCS1800 or PCS1900 Single-Mode Phones IS-136 TDMA Dual-Band Phones
Pin Configurations/Functional Diagrams
SHDN (GND) GSMIN
1 2 LOW
HIGH DC BIAS CONTROL LOW HIGH
10 GAIN 9 8 7 GSMOUT VCC DCSOUT
SHDN 1 GND 2 DCSIN 3 GND 4 LOW HIGH DC BIAS CONTROL
8 7 6 5
GAIN VCC DCSOUT GND
GND 3 DCSIN 4 BAND 5
MAX2651 MAX2652
6
GND
MAX2653
( ) ARE FOR MAX2651.
________________________________________________________________ Maxim Integrated Products
1
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V SHDN, GAIN, BAND to GND......................-0.3V to (VCC + 0.3V) GSMIN, DCSIN ..........................................1.0V peak (+10dBm) Input Current (all digital inputs) .......................................10mA Continuous Power Dissipation 8-Pin MAX (derate 4.5mW/C above +70C)..............362mW 10-Pin MAX (derate 5.6mW/C above +70C) ............444mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS--MAX2651
(VCC = +2.7V to +3.3V, BAND = GAIN = VCC, no input signal, all input/output ports terminated in 50, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3V, TA = +25C.) (Note 1) PARAMETER Input Voltage Range SYMBOL VCC DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = VCC) Input Logic Threshold High Input Logic Threshold Low Input Logic High Current Input Logic Low Current VIH VIL IIH IIL VIN = VCC VIN = GND -1.5 0.5 1.5 CONDITIONS MIN 2.7 5.7 2.2 5.9 2.2 TYP MAX 3.3 8.7 3.3 mA 9.6 3.6 1.5 V V A A UNITS V
Input Supply Current
ICC
DC ELECTRICAL CHARACTERISTICS--MAX2652
(VCC = +2.7V to +3.3V, BAND = GAIN = VCC, no input signal, all input/output ports terminated in 50, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3V, TA = +25C.) (Note 1) PARAMETER Input Voltage Range SYMBOL VCC DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = VCC) Shutdown Supply Current Input Logic Threshold High Input Logic Threshold Low Input Logic High Current Input Logic Low Current 2 VIH VIL IIH IIL VIN = VCC VIN = GND -1.5 0.5 1.5 SHDN = GND CONDITIONS MIN 2.7 7.0 2.3 7.2 2.4 0.25 1.5 TYP MAX 3.3 11.0 3.6 mA 11.0 3.7 A V V A A UNITS V
Input Supply Current
ICC
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
DC ELECTRICAL CHARACTERISTICS--MAX2653
(VCC = +2.7V to +3.3V, SHDN = GAIN = VCC, no input signal, all input/output ports terminated in 50, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3V, TA = +25C.) (Note 1) PARAMETER Input Voltage Range Input Supply Current Shutdown Supply Current Input Logic Threshold High Input Logic Threshold Low Input Logic High Current Input Logic Low Current SYMBOL VCC ICC ISHDN VIH VIL IIH IIL VIN = VCC VIN = GND -1.5 0.5 3 DCS band, high-gain mode (GAIN = VCC) DCS band, low-gain mode (GAIN = GND) SHDN = GND CONDITIONS MIN 2.7 5.4 2.2 0.25 1.5 TYP MAX 3.3 8.5 3.2 UNITS V mA A V V A A
MAX2651/MAX2652/MAX2653
Note 1: Devices are production tested at TA = +25C. Minimum and maximum limits are guaranteed by design and characterization.
AC ELECTRICAL CHARACTERISTICS--MAX2651
(MAX2651 EV kit, fIN = 945MHz (GSM band), fIN = 1850MHz (DCS band), PIN = -30dBm, input and output matching networks are optimized for the frequency band of interest, all input/output ports terminated in 50, VCC = +3V, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Input Frequency Range (Note 3) SYMBOL fIN CONDITIONS DCS band (BAND = VCC) GSM band (BAND = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) Power Gain (Note 4) G GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) Noise Figure (Note 4) NF DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 16.5 16 -3.5 -4 1.8 5.5 1.2 5.3 -2 18 19.5 20 -0.5 0 2.05 6.0 dB 1.4 6.7 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C MIN 1805 925 16.5 16 -3.5 -4 -2 TYP MAX 1880 960 19.5 20 -0.5 0 dB UNITS MHz
18
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
AC ELECTRICAL CHARACTERISTICS--MAX2651 (continued)
(MAX2651 EV kit, fIN = 945MHz (GSM band), fIN = 1850MHz (DCS band), PIN = -30dBm, input and output matching networks are optimized for the frequency band of interest, all input/output ports terminated in 50, VCC = +3V, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = GND) MIN -11.5 -1.5 -10.5 -2.5 -20 -9.5 -20 -10.5 TYP -10 0.5 dBm -8.5 0.5 -18 -8 dBm -18 -8.5 -11 -14 -11 -20 -14 -12 -19 -20 -32 -20 -39 -22 -8.5 -12 dB -8.5 -15 -10 -10 dB -15 -15 -29 -18 dB -35 -20 MAX UNITS
(Note 5) Input Third-Order Intercept Point IIP3 (Note 6)
DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND)
Input 1dB Compression Point
IP-1dB
Input Return Loss
S11
2
Output Return Loss
S22
2
Reverse Isolation
S12
2
4
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2652
(MAX2652 EV kit, fIN = 945MHz (GSM band), fIN = 1850MHz (DCS band), PIN = -30dBm, input and output matching networks are optimized for the frequency band of interest, all input/output ports terminated in 50, VCC = +3V, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Input Frequency Range (Note 3) SYMBOL fIN CONDITIONS DCS band (BAND = VCC) GSM band (BAND = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) Power Gain (Note 4) G GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) Noise Figure (Note 4) NF DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = GND) -8.5 0 -9 0.5 -18 -10.5 -18 -10 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 16.5 16 -4.0 -4.5 1.8 5.8 1.3 5.5 -7 1.5 dBm -7.5 2.5 -16.5 -8 dBm -16.5 -8.5 -2 18 19.5 20 -0.5 0 2.0 6.3 dB 1.5 6.7 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C MIN 1805 925 16 15.5 -3.5 -4 -2 TYP MAX 1880 960 19 19.5 -0.5 0 dB UNITS MHz
MAX2651/MAX2652/MAX2653
17.5
(Note 5) Input Third-Order Intercept Point IIP3 (Note 6)
DCS band, high-gain mode (BAND = GAIN = VCC) Input 1dB Compression Point DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GND, GAIN = GND)
IP-1dB
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
AC ELECTRICAL CHARACTERISTICS--MAX2652 (continued)
(MAX2652 EV kit, fIN = 945MHz (GSM band), fIN = 1850MHz (DCS band), PIN = -30dBm, input and output matching networks are optimized for the frequency band of interest, all input/output ports terminated in 50, VCC = +3V, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) DCS band, high-gain mode (BAND = GAIN = VCC) DCS band, low-gain mode (BAND = VCC, GAIN = GND) GSM band, high-gain mode (BAND = GND, GAIN = VCC) GSM band, low-gain mode (BAND = GAIN = GND) MIN TYP -12 -12 -11 -20 -11 -17 -12.5 -15 -29 -19 -37 -23 MAX -9.5 -9.5 dB -9.5 -15 -9.5 -13 dB -11 -13 -26 -17 dB -34 -20 UNIT
Input Return Loss
S11
2
Output Return Loss
S22
2
Reverse Isolation
S12
2
6
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS--MAX2653
(MAX2653 EV kit, fIN = 1850MHz (DCS band), fIN = 1960MHz (PCS band), PIN = -30dBm, input and output matching networks are optimized for the frequency band of interest, all input/output ports terminated in 50, VCC = +3V, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Input Frequency Range (Note 3) SYMBOL fIN BAND = VCC DCS and PCS band, high-gain mode (BAND = GAIN = VCC) Power Gain (Note 4) G DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) High-gain mode (BAND = GAIN = VCC) TA = +25C TA = -40C to +85C DCS band PCS band -4 -4 1.7 1.8 5.3 -10.5 -1 -20 -9 -8.5 dBm +1.5 -18 dB -7 -11 -11 -12 -15 -35 -33 -21 -21 -8.5 dB -9.5 -9.5 dB -12 -31 -29 -18 -18 dB -2.5 -1 0 1.9 2.05 6.7 dB CONDITIONS DCS band PCS band TA = +25C TA = -40C to +85C MIN 1805 1930 17 16 18.5 TYP MAX 1880 1990 20 20 dB UNITS MHz
MAX2651/MAX2652/MAX2653
Noise Figure (Note 4)
NF
DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) Input Third-Order Intercept Point (Notes 5, 7) DCS and PCS band, high-gain mode (BAND = VCC, GAIN = GND) DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) DCS and PCS band, high-gain mode (BAND = GAIN = VCC) DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) DCS and PCS band, high-gain mode (BAND = GAIN = VCC) DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) DCS and PCS band, high-gain mode (BAND = GAIN = VCC) DCS and PCS band, low-gain mode (BAND = VCC, GAIN = GND) High-gain mode (BAND = GAIN = VCC) Low-gain mode (BAND = VCC, GAIN = GND) DCS band PCS band DCS band PCS band
IIP3
Input 1dB Compression Point
IP-1dB
Input Return Loss
S11
2
Output Return Loss
S22
2
Reverse Isolation
S12
2
Note 2: Minimum and maximum limits are guaranteed by design and characterization, but not production tested. Note 3: The part has been fully characterized at the specified frequency range. Operation outside of this range is possible but not guaranteed. Note 4: Specification excludes circuit board losses. Note 5: Measured with two tones, fIN1 = 1850MHz, fIN2 = 1850.8MHz, PIN = -33dBm for each tone. Note 6: Measured with two tones, fIN1 = 945MHz, fIN2 = 945.8MHz, PIN = -33dBm for each tone. Note 7: Measured with two tones, fIN1 = 1960MHz, fIN2 = 1960.8MHz, PIN = -33dBm for each tone.
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
Typical Operating Characteristics
(MAX2651 EV kit, VCC = +3.0V, input and output matched with recommended matching networks, TA = +25C, unless otherwise noted.)
MAX2651 (GSM Band)
POWER GAIN vs. INPUT POWER
20
MA\X2651-01
POWER GAIN vs. FREQUENCY
MA\X2651-02
INPUT RETURN LOSS vs. FREQUENCY
MA\X2651-03
-1 20 HIGH GAIN 10 LOW GAIN (dB)
0
18 POWER GAIN (dB)
LOW GAIN
-3
-5 S112 (dB) HIGH GAIN -10
HIGH GAIN
GAIN (dB)
16
-5
0 LOW GAIN -10
14
-7
-15 LOW GAIN -20
12 fIN = 945MHz 10 -25 -20 -15 -10 -5 0 PIN (dBm)
-9 -20 -11 800 840 880 920 960 1000 FREQUENCY (MHz)
-25 800 840 880 920 960 1000 FREQUENCY (MHz)
OUTPUT RETURN LOSS vs. FREQUENCY
MA\X2651-04
REVERSE ISOLATION vs. FREQUENCY
MA\X2651-05
0
0
-5
S222 (dB)
-10 S122 (dB)
-10
HIGH GAIN
-20
LOW GAIN
-15 LOW GAIN -20
-30 HIGH GAIN -40
-25 800 840 880 920 960 1000 800 840 880 920 960 1000 FREQUENCY (MHz) FREQUENCY (MHz)
SUPPLY CURRENT vs. VCC HIGH GAIN
MAX2651-06
SUPPLY CURRENT vs. VCC LOW GAIN
MAX2651-07
8 NO INPUT SIGNAL 7 ICC (mA) TA = +25C
3.0
2.5 ICC (mA) TA = +85C
TA = +85C
6
2.0
TA = +25C
5
TA = -40C
1.5 NO INPUT SIGNAL
TA = -40C
4 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
1.0 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
8
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(MAX2651 EV kit, VCC = +3.0V, input and output matched with recommended matching networks, TA = +25C, unless otherwise noted.)
MAX2651/MAX2652/MAX2653
MAX2651 (DCS Band)
POWER GAIN vs. INPUT POWER
19
MA\X2651-08
POWER GAIN vs. FREQUENCY
20
MA\X2651-09
INPUT RETURN LOSS vs. FREQUENCY
MA\X2651-10
0
0
17 POWER GAIN (dB)
LOW GAIN
-2 10 LOW GAIN (dB) S212 (dB)
HIGH GAIN S112 (dB) -10 HIGH GAIN
15
HIGH GAIN
-4
0 LOW GAIN -10
13
-6
11 9 -25 f = 1840MHz -20 -15 -10 -5 0
-8 -20 -10 1800 1840 1880 1920 1960 2000 PIN (dBm) FREQUENCY (MHz)
-20
LOW GAIN
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
OUTPUT RETURN LOSS vs. FREQUENCY
MA\X2651-11
REVERSE ISOLATION vs. FREQUENCY
MA\X2651-12
0
0
-10 S222 (dB) -10 HIGH GAIN S122 (dB)
LOW GAIN -20
-20
LOW GAIN
-30 HIGH GAIN
-40 1800 1840 1880 1920 1960 2000 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) FREQUENCY (MHz)
SUPPLY CURRENT vs. VCC HIGH GAIN
MAX2651-13
SUPPLY CURRENT vs. VCC LOW GAIN
TA = +85C 2.5 ICC (mA)
MAX2651-14
8 NO INPUT SIGNAL TA = +85C 7 ICC (mA)
3.0
6
2.0
TA = +25C
5
TA = +25C
TA = -40C
1.5 NO INPUT SIGNAL
TA = -40C
4 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
1.0 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
Typical Operating Characteristics (continued)
(MAX2652 EV kit, VCC = +3.0V, input and output matched with recommended matching networks, TA = +25C, unless otherwise noted.)
MAX2652 (GSM Band)
POWER GAIN vs. INPUT POWER
20 LOW GAIN 18 HIGH GAIN HIGH GAIN (dB) 16 14 12 10 f = 945MHz 8 -25 -20 -15 -10 -5 0 PIN (dBm) -14 800 840 880 920 960 1000 FREQUENCY (MHz) -4 HIGH GAIN LOW GAIN (dB) S112 (dB) -6 -8 -10 -12 -20 -50 800 840 880 920 960 1000 FREQUENCY (MHz) 10 GAIN (dB) -20
MA\X2652-01
POWER GAIN vs. FREQUENCY
MA\X2652-tocA
INPUT RETURN LOSS vs. FREQUENCY
MA\X2652-tocB
-2 20
0
-10
HIGH GAIN
0 LOW GAIN -10
LOW GAIN
-30
-40
OUTPUT RETURN LOSS vs. FREQUENCY
MA\X2652-tocC
REVERSE ISOLATION vs. FREQUENCY
MA\X2652-tocD
HIGH-GAIN MODE SUPPLY CURRENT vs. SUPPLY VOLTAGE
8.5 8.0
MAX2652-toc02
0
0
9.0 TA = +85C
-10 S222 (dB)
HIGH GAIN
-10 S122 (dB)
LOW GAIN
ICC (mA)
-20
-20
7.5 7.0 6.5 TA = +25C
-30
LOW GAIN
-30 HIGH GAIN -40
-40
6.0 5.5 TA = -40C 5.0 NO INPUT SIGNAL 3.0 3.1 3.2 3.3
-50 800 840 880 920 960 1000 FREQUENCY (MHz)
-50 800 840 880 920 960 1000 FREQUENCY (MHz)
2.7
2.8
2.9
SUPPLY VOLTAGE (V)
LOW-GAIN MODE SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2652 toc03
INPUT IP3 vs. SUPPLY VOLTAGE
LOW GAIN 3 1 INPUT IP3 (dBm) TA = +25C TA = -40C TA = +85C
MAX2652 toc03a
INPUT P1dB vs. SUPPLY VOLTAGE
LOW GAIN -8 INPUT P1dB (dBm) -10 -12 -14 -16 TA = +25C -18 TA = -40C TA = +25C TA = +85C TA = +85C HIGH GAIN
MAX2652 toc03b
3.5
5
-6
3.0 TA = +85C ICC (mA) 2.5 TA = +25C 2.0 TA = -40C 1.5 NO INPUT SIGNAL 1.0 2.7 2.8 2.9 3.0 3.1 3.2
-1 -3 -5 -7 -9 -11 HIGH GAIN
TA = +85C TA = +25C
TA = -40C 2.7 2.8 2.9 3.0 3.1 3.2 3.3
TA = -40C -20 2.7 2.8 2.9 3.0 3.1 3.2 3.3 SUPPLY VOLTAGE (V)
3.3
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
10
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GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(MAX2652 EV kit, VCC = +3.0V, input and output matched with recommended matching networks, TA = +25C, unless otherwise noted.)
MAX2651/MAX2652/MAX2653
MAX2652 (DCS Band)
POWER GAIN vs. INPUT POWER
20 LOW GAIN 18 HIGH GAIN HIGH GAIN (dB) LOW GAIN (dB) 16 14 12 10 f = 945MHz 8 -25 -20 -15 -10 -5 0 PIN (dBm) -12 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) -4 -6 -8 -10 -20 -50 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) GAIN (dB) -2 10 S112 (dB) -20 LOW GAIN
MA\X2652-toc04
POWER GAIN vs. FREQUENCY
MA\X2652 toc05
INPUT RETURN LOSS vs. FREQUENCY
HIGH GAIN -10
MA\X2652 toc06
0 20 HIGH GAIN
0
0 LOW GAIN -10
-30
-40
OUTPUT RETURN LOSS vs. FREQUENCY
MA\X2652 toc07
REVERSE ISOLATION vs. FREQUENCY
MA\X2652 toc08
HIGH-GAIN SUPPLY CURRENT vs. SUPPLY VOLTAGE
NO INPUT SIGNAL 8.5 8.0 TA = +85C
MAX2652-toc09
0 HIGH GAIN -10 S222 (dB)
0
9.0
-10 LOW GAIN S122 (dB)
LOW GAIN
ICC (mA)
-20
-20
7.5 7.0 6.5 TA = +25C
-30
-30 HIGH GAIN
6.0 5.5 TA = -40C 2.7 2.8 2.9 3.0 3.1 3.2 3.3
-40
-40
-50 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz)
-50 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz)
5.0 SUPPLY VOLTAGE (V)
LOW-GAIN SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2652 toc10
INPUT IP3 vs. SUPPLY VOLTAGE
MAX2652 toc10a
INPUT P1dB vs. SUPPLY VOLTAGE
TA = +85C -6 INPUT 1dB (dBm) -8 LOW GAIN TA = +25C TA = -40C
MAX2652 toc10b
3.0
4 TA = +85C 2 0 -2 -4 -6 -8 -10 TA = +25C TA = -40C LOW GAIN
-4
2.5 ICC (mA)
TA = +85C
TA = +25C 2.0
INPUT IP3 (dBm)
HIGH GAIN TA = +85C TA = +25C TA = -40C 2.7 2.8 2.9 3.0 3.1 3.2 3.3 SUPPLY VOLTAGE (V)
TA = -40C 1.5 NO INPUT SIGNAL 1.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 SUPPLY VOLTAGE (V)
-14 -16 -18 2.7
TA = +85C TA = +25C TA = -40C 2.8 2.9 3.0 3.1 3.2 3.3 HIGH GAIN
SUPPLY VOLTAGE (V)
______________________________________________________________________________________
11
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
Typical Operating Characteristics (continued)
(MAX2653 EV kit, VCC = +3.0V, input and output matched with recommended matching networks, TA = +25C, unless otherwise noted.)
MAX2653 (DCS Band)
POWER GAIN vs. INPUT POWER
MA\X2651-15
POWER GAIN vs. FREQUENCY
-3 20 HIGH GAIN -5 LOW GAIN (dB) 10 S112 (dB) GAIN (dB)
MA\X2653-16
INPUT RETURN LOSS vs. FREQUENCY
MA\X2653-17
0
18 LOW GAIN POWER GAIN (dB) 16 HIGH GAIN
-4
14
-7
0 LOW GAIN -10
-8 LOW GAIN -12 HIGH GAIN
12
-9
10 -25
f = 1840MHz -20 -15 -10 -5 0
-11
-20 -16 1800 1840 1880 1920 1960 2000 1800 1840 1880 1920 1960 2000
PIN (dBm)
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT RETURN LOSS vs. FREQUENCY
MA\X2653-18
REVERSE ISOLATION vs. FREQUENCY
MA\X2653-19
0 HIGH GAIN -10 S222 (dB) LOW GAIN -20
0
-10 S122 (dB) LOW GAIN
-20
-30 -30 -40 -40 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) 1800 1840 HIGH GAIN
1880
1920
1960
2000
FREQUENCY (MHz)
SUPPLY CURRENT vs. VCC HIGH GAIN
MAX2651-20
SUPPLY CURRENT vs. VCC LOW GAIN
TA = +85C 2.5 ICC (mA)
MAX2651-21
8 NO INPUT SIGNAL TA = +85C 7 ICC (mA)
3.0
6
2.0
TA = +25C
5
TA = +25C
TA = -40C
1.5 NO INPUT SIGNAL
TA = -40C
4 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
1.0 2.7 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3
12
______________________________________________________________________________________
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
Pin Description
PIN MAX2652 NAME MAX2651 -- 1, 3, 6 2 4 5 7 8 9 10 MAX2652 1 3, 6 2 4 5 7 8 9 10 MAX2653 1 2, 4, 5 -- 3 -- 6 7 -- 8 SHDN GND GSMIN DCSIN BAND DCSOUT VCC GSMOUT GAIN Shutdown Logic Input. Drive low to enter shutdown; drive high or connect to VCC for normal operation. RF Ground. Connect to the ground plane as close to the IC as possible to minimize trace inductance. RF Input for GSM Band RF Input for DCS and PCS bands Band-Select Logic Input. Drive BAND high to enable DCS/PCS LNA; drive low to enable GSM LNA. RF Output for DCS and PCS Bands Supply Voltage Input, +2.7V < VCC < +3.3V RF Output for GSM Band Gain-Select Logic Input. Drive GAIN high for high-gain operation; drive GAIN low for low-gain operation. FUNCTION
MAX2651/MAX2652/MAX2653
LOGIC-LEVEL GAIN CONTROL
VCC
910 1 8.2nH GSM INPUT (925MHz TO 960MHz) 15pF 68pF 2 GND GAIN 10 180 220pF 9 VCC 8 10F 4 DCSIN DCSOUT 7
100pF
8.2nH C9 2.2pF GSM OUTPUT
MAX2651
GSMIN GSMOUT
3 47pF DCS INPUT (1805MHz TO 1880MHz) 1.5pF 5 220pF 910 3.9nH
GND
VCC
1.2pF DCS OUTPUT
BAND
GND
6
330
2.2nH 220pF
VCC
LOGIC-LEVEL BAND CONTROL
Figure 1. MAX2651 Typical Application Circuit
______________________________________________________________________________________
13
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
LOGIC-LEVEL SHUTDOWN CONTROL LOGIC-LEVEL GAIN CONTROL VCC
910 1 6.8nH GSM INPUT (925MHz TO 960MHz) 5.6pF 68pF 2 220pF SHDN GAIN 10
910
100pF
240 220pF 9 VCC 8 10F
8.2nH C9 2.2pF GSM OUTPUT
MAX2652
GSMIN GSMOUT
3 47pF DCS INPUT (1805MHz TO 1880MHz) 1.1pF 5 220pF 910 3.3nH
GND
VCC
1.2pF DCS OUTPUT 2.2nH 220pF
4
DCSIN
DCSOUT
7
BAND
GND
6
1F VCC
LOGIC-LEVEL BAND CONTROL
Figure 2. MAX2652 Typical Application Circuit
LOGIC-LEVEL SHUTDOWN CONTROL
LOGIC-LEVEL GAIN CONTROL
1k
1k
MAX2653
1 100pF 2 3.3nH 2200pF 1.5pF 4 GND GND 5 330 (510*) GND VCC 7 SHDN GAIN 8 VCC
100pF
200pF 1.0pF (0.8pF*) 6 2.7nH (2.2nH*) 47pF
DCS INPUT (1805MHz TO 1880MHz)
3
DCSIN
DCSOUT
DCS OUTPUT
VCC * FOR OPTIMUM PCS-BAND (1930MHz TO 1990MHz) PERFORMANCE, USE THESE COMPONENTS.
Figure 3. MAX2653 Typical Application Circuit
14
______________________________________________________________________________________
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers
Detailed Description
Gain Select
The MAX2651/MAX2652/MAX2653 offer a step gain in the LNA to optimize the receiver's dynamic range. A logic-level low at GAIN reduces the active LNA's gain by about 20dB and reduces supply current by 3.5mA.
Layout and Power-Supply Bypassing
A properly designed PC board is essential to any RF/microwave circuit. Be sure to use controlled impedance lines on all high-frequency inputs and outputs. Proper grounding of the GND pins is fundamental; if the PC board uses a topside RF ground, connect all GND pins directly to it. For boards where the ground plane is not on the component side, it's best to connect all GND pins to the ground plane with plated throughholes close to the package. To minimize coupling between different sections of the system, the ideal power-supply layout is a star configuration with a large decoupling capacitor at a central VCC node. The VCC traces branch out from this central node, each leading to a separate VCC node on the PC board. A second bypass capacitor that has low ESR at the RF frequency of operation is placed at the end of each trace. This arrangement provides local decoupling at the VCC pin. At high frequencies, any signal leaking out of one supply pin sees a relatively high impedance (formed by the VCC trace inductance) to the central VCC node and an even higher impedance to any other supply pin, as well as a low impedance to ground through its bypass capacitor.
MAX2651/MAX2652/MAX2653
Shutdown Functionality
The MAX2652/MAX2653 offer a low-current shutdown feature. Drive SHDN low to power down the LNA and reduce supply current to less than 0.25A.
Applications Information
External Components
The MAX2651/MAX2652/MAX2653 require matching circuits at their inputs and outputs for operation in a 50 system. The application circuits in Figures 1, 2, and 3 describe the matching circuits for each device's LNA; suggested component values, suppliers, and part numbers are listed in the MAX2651/MAX2652/ MAX2653 EV kits manual. These values are optimized for best simultaneous noise figure, gain, and return loss performance. Input and output impedance matching networks are very sensitive to layout-related parasitics. It is important to keep all matching components as close to the device as possible to minimize the effects of stray inductance and stray capacitance of PC board traces, particularly for the 1800MHz and 1900MHz bands.
Chip Information
MAX2651 TRANSISTOR COUNT: 272 MAX2652 TRANSISTOR COUNT: 272 MAX2653 TRANSISTOR COUNT: 253
Using the Collector Load Resistor to Set Gain
The MAX2651/MAX2652/MAX2653 provide open-collector output stages to allow an external resistor to set the gain. The collector pull-up resistors set the gain for each LNA to about 18dB. Lower gains are achieved by reducing this resistance, and higher gains are achieved by increasing it. The maximum achievable gain is defined by the maximum collector current swing. Note that the value of the collector gain-setting resistor principally defines the LNA's output impedance, and that the matching networks are tuned to match this impedance to 50. Redefining the LNA gain by changing the collector gain-setting resistor requires retuning the output matching networks.
______________________________________________________________________________________
15
GSM900 and DCS1800/PCS1900 Dual-Band, Low-Noise Amplifiers MAX2651/MAX2652/MAX2653
Package Information
8LUMAXD.EPS
Note: The packages for these devices do not feature the exposed pad.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
10LUMAX.EPS

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