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CXA1999N
IF Amplifier for M-ary FSK Pagers
Description The CXA1999N is a low current consumption FM IF amplifier which employs the newest bipolar process. It is suitable for M-ary FSK pagers. Features * Low current consumption: 1.16 mA (typ. at VCC = 1.4 V) * Low voltage operation: VCC = 1.1 to 4.0 V * Small package 20-pin SSOP * Second mixer and oscillator * Needless of IF decoupling capacitor * Reference power supply for operational amplifier and comparator * IF input, VCC standard Applications * M-ary FSK pagers * Double conversion pagers Structure * Bipolar silicon monolithic IC 20 pin SSOP (Plastic)
Absolute Maximum Ratings * Supply voltage * Operating temperature * Storage temperature * Allowable power dissipation Operating Condition Supply voltage
VCC 7.0 V Topr -20 to +75 C Tstg -65 to +150 C PD 375 mW
VCC1
1.1 to 4.0
V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
--1--
E95517C8Y
Block Diagram and Pin Configuration
20 REG OUT REG CONT LVA OUT NRZ OUT CHARGE LEVEL COMPARATOR L.C. OUT
19
18
17
16
15
14
13
12 LPF OUT
11 LPF IN
MIX IN
GND
MIXER REGULATOR ALARM NRZ COMPARATOR QUICK CHARGE
--2--
IF LIM MIX OUT VCC IF IN B.S. FSK REF
QUAD DET
LOCAL OSCILLATOR DET OUT QUAD
OSC IN
OSC OUT
RSSI
1
2
3 4 5
6
7
8
9
10
CXA1999N
CXA1999N
Pin Description Pin No. 1 Symbol Pin voltage Equivalent circuit
VCC 300 15k
Description
OSC IN
1.4 V
1 2
15k 72
2
OSC OUT
0.7 V
230 GND VCC 1.5k
Connects the external parts of crystal oscillator circuit. A capacitor and crystal oscillator are connected to these pins and VCC.
3
3
MIX OUT
1.2 V
Mixer output. Connect a 455 kHz ceramic filter between this pin and IF IN.
GND
4
VCC
8k 8k 1.5k VCC 1.5k
Power supply.
5
IF IN
1.4 V
5
IF limiter amplifier input.
GND 72
6
40k
6
B.S.
--
140k GND VCC
Controls the battery saving. Setting this pin low suspends the operation of IC. (Applied voltage range: -0.5 V to +7.0 V)
7
FSK REF
0.2 V
72
7
Connects the capacitor that determines the low cut-off frequency for the entire system.
GND
--3--
CXA1999N
Pin No.
Symbol
Pin voltage
Equivalent circuit
VCC 22k 20k
Description
8
QUAD
1.4 V
8
20p GND VCC 50p
Connects the phase shifter of FM detector circuit.
9
DET OUT
0.2 V
9
72 55k
FM detector output.
GND VCC 7k 7k
10
RSSI
0V
10 70k
RSSI circuit output.
GND VCC
11
LPF IN
0.2 V
11 72
Operational amplifier input.
GND VCC
72
12
LPF OUT
0.2 V
12 72 GND
Level comparator and NRZ comparator inputs. Output for operational amplifier is connected.
--4--
CXA1999N
Pin No.
Symbol
Pin voltage
Equivalent circuit
Description Level comparator, NRZ comparator and LVA comparator outputs. They are open collectors. (Applied voltage range: -0.5 V to +7.0 V) Controls the ON/OFF operation of the quick-charge circuit. Set this pin high to execute the quick charge. (Applied voltage range: -0.5 V to +7.0 V)
13
72
13 15 16
L.C. OUT NRZ OUT LVA OUT
-- -- --
15 16 GND
20k 14
14
CHARGE
0V
100k
GND VCC
17
REG CONT
--
17 72
Output for internal constantvoltage source amplifier. Connect the base of PNP transistor. (Current capacity: 100 A)
GND VCC
18
REG OUT
1.0 V
78k 18 1k 22k GND
Constant-voltage source output. Controlled to maintain 1.0 V.
19
GND
--
4.16k 4.16k VCC 2k
Ground
20
MIX IN
1.4 V
20
Mixer input.
GND
--5--
CXA1999N
Electrical Characteristics (VCC = 1.4 V, Ta = 25 C, Fs = 21.7 MHz, FMOD = 1.6 kHz, FDEV = 4.8 kHz, AMMOD = 30 %) Item Current consumption Current consumption AM rejection ratio Op amp. input bias current Op amp. maximum output level NRZ output saturation voltage NRZ output leak current NRZ hysteresis width VB output current VB output saturation voltage REG OUT voltage LVA operating voltage LVA output leak current LVA output saturation voltage Detector output voltage Logic input voltage high level Logic input voltage low level Limiting sensitivity Level comparator output saturation voltage Level comparator output leak current RSSI output offset Mixer input resistance Mixer output resistance IF limiter input resistance Symbol ICC ICCS AMRR IBIAS VO VSATNRZ ILNRZ VTWNRZ IOUT VSATVB VREG VLVA ILLVA VSATLVA VODET VTHBSV VTLBSV VIN (LIM) VSATLC ILLC VORSSI RINLIM ROUTMIX RINLIM Conditions Measurement circuit 1 V2 = 1.0 V Measurement circuit 1, V2 = 0 V Measurement circuit 3 30k LPF Measurement circuit 2 Measurement circuit 4 Measurement circuit 6 Vin = 0.3 V Measurement circuit 5 Vin = 0.1 V Measurement circuit 5 Vin = 0.1 to 0.3 V Measurement circuit 7 Measurement circuit 7 Output current 0 A Measurement circuit 8 V1 = 1.4 to 1.0 V Measurement circuit 8 V1 = 1.0 V Measurement circuit 9 Measurement circuit 3 -- -- Measurement circuit 3 Measurement circuit 11 Measurement circuit 10 Measurement circuit 12 -- -- -- Min. 0.8 -- 25 -- 160 -- -- -- 100 -- 0.89 1.00 -- -- 38 0.9 -- -- -- -- -- 1.6 1.2 1.2 Typ. 1.16 6 -- -- -- -- -- 10 -- -- 0.96 1.05 -- -- 50 -- -- 5 -- -- 400 2.0 1.5 1.5 Max. 1.5 20 -- 100 -- 0.4 5.0 20 -- 0.4 1.04 1.10 5.0 0.4 68 -- 0.35 14 0.4 5.0 550 2.4 1.8 1.8 Unit mA A dB nA mVp-p V A mV A V V V A V mVrms V V dB V A mV k k k
--6--
Electrical Characteristics Measurement Circuit
Vin GND 0.2V V3 GND A V3 20 19 18 17 16 15 14 13 12 11 17 16 15 14 13 12 11 13 12 11 20 19 18 1.8 0.2V
20
19
18
17
16
15
14
1
10 VCC V1 V2 22p
2 3 3 4 4 8 9
3
4
5
6
7
8
9
1
10
2 1 2
5
6
7
10p to 120p 0.01
5
6
V2
7
1
8
9
4.7k
10
VCC
V1
15p
A 1.4V GND 1.0V GND
V2
V
1.0V VCC V1 1.4V
1.4V
V
Vin 12 20 19 18 17 16 15 11 14
100k
--7-- Measurement circuit 2
0.2V V3
Measurement circuit 1
Measurement circuit 3
A V
Vin 13 12 11 20 19 18 17 16 15
V
50A 14 13 12 Vin 11
20
19
18
17
16
15
14
13
1 1 3 2
2
10
3
4
5
6
7
8
9
4
VCC
5
6
7
8
9
10
1
2
3
4
VCC V1 V1 1.4V V2
5
6
V2 1.4V 1.0V
7
8
9
10
V2
VCC
1.0V
1.0V
V1
1.4V
CXA1999N
Measurement circuit 4
Measurement circuit 5
Measurement circuit 6
A
100k
0.5V
V V
V3 13 20 19 18 17 16 15 14 12 11 20 13 19 18 17 16 15 14 13 12 11 50A 12 0.2V
V
V3
100A
20
19
18
17
16
15
14
11
1 1
VCC V1 VCC V1 1.4V
2
3
10
4 1 2 3 4 5 2 5 6 7
10
5
6
7
8
9
3
4
8
9
6
V2
7
8
9
10
VCC V1
V2
1.4V GND
1.0V GND
1.0V
Measurement circuit 7
Measurement circuit 8
Measurement circuit 9
100k
--8--
A V
Vin 12 20 19 18 17 16 15 11 14 13 12 0.2V
V
50A 0.1V Vin 11 20 19 18 17 16 15 14 13 12 11
20
19
18
17
16
15
14
13
1
VCC
2
3
4
10
5 1 2 3
6
7
8
9
4
V1
5
6
V2 1.4V
7
8
9
10
1
2
3
VCC 1.0V
4
V1
5
6
7
V2 1.4V 1.0V
8
9
10
VCC
V1
V2
V
1.4V
1.0V
CXA1999N
Measurement circuit 10
Measurement circuit 11
Measurement circuit 12
Application Circuit
VCC REG OUT ALARM 220 0.01 100k 560P 39k 2200P 39k 18 REG OUT REG CONT ALM LEVEL COMPARATOR CHARGE NRZ OUT L.C. OUT LPF OUT 17 16 15 14 13 12 11 LPF IN 100k 100k 39k 1200P NRZ OUT COMP OUT
10P to 120P
10
1.8
0.01
20
19
MIX IN
GND
MIXER REGULATOR ALARM NRZ COMPARATOR QUICK CHARGE
--9--
IF LIM
QUAD DET
LOCAL OSCILLATOR
1
VCC
OSC IN
2
OSC OUT
3 4 5
MIX OUT VCC IF IN
6
B.S
7
FSK REF
8
QUAD
9
DET OUT
10
RSSI
22P
1 4.7k CFW455D CDBM 455C28 100P RSSI
15P
VCC
CXA1999N
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
CXA1999N
Application Note 1) Power Supply The CXA1999N, with built-in regulator, is designed to permit stable operation at wide range of supply voltage from 1.1 to 4.0 V. Decouple the wiring to VCC (Pin 4) as close to the pin as possible. 2) Oscillator Input Oscillator input method a) Using Pins 1 and 2, input self-excited oscillation signal through the composition of a Colpitts type crystal oscillator circuit. b) Directly input a local oscillation signal to Pin 1.
1
2
3
Ceramic filter
1
2
3
VCC
From local signal
Ceramic filter
Fig. 1 3) Mixer The mixer is of double-balance type. Pin 20 is the input pin. Input though a suitable matching circuit. The input impedance is 2.0 k. Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5 k is incorporated. 4) IF Filter The filter to be connected between this mixer output and the IF limiter amplifier input should have the following specifications. I/O impedance : 1.5 k 10 % Band width : Changes according to applications. 5) IF Limiter Amplifier The gain of this IF limiter amplifier is approximately 100 dB. Take notice of the following points in making connection to the IF limiter amplifier input pin (Pin 5). a) Be sure to wire to the IF limiter amplifier input (Pin 5) is as short as possible. b) As the IF limiter amplifier output appears at QUAD (Pin 8), be sure to wire to the ceramic discriminator connected to QUAD is as short as possible and reduce the interference with the mixer output and IF limiter amplifier input.
3 4 5 6 7 8 9
VCC
Shortest possible wirings which must be apart as far as possible
As short as possible
Fig. 2 --10--
CXA1999N
6) Quick Charge In order to hasten the rising time from when power is turned on, the CXA1999N features a quick charge circuit. Therefore, the quick charge circuit eliminates the need to insert a capacitor between the detector output and the LPF as is the case with conventional ICs, but connects a capacitor to Pin 7 to determine the average signal level during steady-state reception. The capacitance of the capacitor connected to Pin 7 should be chosen such that the voltage does not vary much due to discharge during battery saving. Connect a signal for controlling the quick charge circuit to Pin 14. Setting this pin high enables the quick charge mode, and setting this pin low enables the steady-state reception mode. Quick charge is used when the power supply is turned on. The battery saving must be set high at the time. Connect Pin 14 to GND when quick charge is not being used.
Timing Power supply (Pin number 4) Quick charge (Pin number 14) Battery save (Pin number 6) H L H L active battery saving
Fig. 3
7) Detector The detector is of quadrature type. To perform phase shift, connect a ceramic discriminator to Pin 8. The phase shifting capacitor for the quadrature detector is incorporated. The demodulated FM (FSK) signal with the detector will be output to DET OUT (Pin 9) through the internal primary LPF. DET OUT output impedance is 200 or less. The DET OUT output is the anti-phase output to NRZ OUT. The CDBM455C28 (MURATA MFG. CO., LTD.) ceramic discriminator is recommended for the CXA1999N.
7
8
9
DET OUTPUT 4.7k Ceramic discriminator CDBM455C28 VCC
--11--
CXA1999N
8) Filter Buffer, Level Comparator and NRZ Comparator An operational amplifier for LPF is built in this IC. It is connected internally to the NRZ comparator, level comparator and quick charge circuit.
15
14
13 L.C.
12
11
0.2V
7
Using the operational amplifier of Pins 11 and 12 to construct an LPF, remove noise from the demodulated signal and input the signal to the above three circuits. The level comparator and the NRZ comparator shape waveform of this input signal and output it as a square wave. The comparator output stage is for open collector. Thus, if the CPU is of CMOS type and the supply voltage is different, a direct interface as illustrated in the figure below can be implemented.
VCC 1.4V VCC
4
CMOS power supply
(15) 13 Comparator output CMOS IC
Fig. 6 9) REG CONT Controls the base bias of the external transistors. 10) LVA OUT This pin goes high (open) when the supply voltage becomes low. Since the output is an open collector, it can be used to directly drive CMOS device. The setting voltage of the LVA is 1.05 V (typ.), and it possesses a hysteresis with respect to the supply voltage. The hysteresis width is 50 mV (typ.). 11) B.S. Operation of the CXA1999N can be halted by setting this pin low. This pin can be connected directly to CMOS device. The current consumption for battery saving is 20 A or less (at 1.4 V).
B.S.
6
Fig. 7 --12--
CXA1999N
12) M-ary (M = 2- or 4-level) FSK Demodulation System Polarity discrimination output and MSB comparator output are used to demodulate the 4-level waveform shown below. [4-level FSK demodulating waveform]
+4.8kHz
+1.6kHz 01 00 10 11 01 10 00
-1.6kHz
-4.8kHz
[NRZ OUT] Polarity discrimination output
(When the input frequency is higher than the local frequency)
POS
0
0
1
1
0
1
0
NEG
The polarity can be inverted by setting the local frequency higher than the input frequency.
[L.C. OUT] MSB comparator output
1.6kHz
1 4.8kHz
0
0
1
1
0
0
The 4-level FSK demodulating data is divided into an NRZ OUT and L.C. OUT shown above. Here, the NRZ OUT corresponds to a conventional NRZ comparator output. The L.C. OUT is made comparing the demodulated waveform amplitude to the IC internal reference voltage levels. When the threshold value of L.C. OUT is not appropriate to the detector output, the resistance value on Pin 8 should be adjusted for the detector output level adjustment. For the 2-level FSK demodulation, it corresponds to a conventional NRZ comparator output.
--13--
CXA1999N
13) Principle of Quick Charge Operation BUF in Fig. 8 is the detector buffer amplifier, and AMP is an operational amplifier to construct an LPF. COMP is the level comparator or the NRZ comparator. The CXA1999N has a feedback loop from the comparator input to the input circuit of the detector output buffer. This equalizes the average value of the comparator input voltage to the reference voltage, with the quick charge circuit of CHG being set in the feedback loop. Switching the current of the quick charge circuit enables reduction of the rise time. In this block, CHG is a comparator which compares input voltages and outputs a current based on this comparison. The current on CHG is switched between high and low at Pin 14. When the power is turned on, switch the current to high to increase the charge current at C in Fig. 8 and shorten the time constant. During steady-state reception mode, switch the current to low, lengthening the charge time constant and allowing for stable data retrieval.
AMP BUF COMP CHG C
Reference voltage
Fig. 8 14) S Curve Characteristics Even if the IF IN input signal frequency is deviated, the feedback is applied to the DET OUT operating point so as to match it to the comparator reference voltage by the quick charge operation shown in Fig. 8. Therefore, this feedback must be halted in order to evaluate the S curve characteristics. To execute the evaluation, measure the average voltage on Pin 12 first and input this voltage to Pin 7 from the external power supply. 15) Example of Data Filter Constants
C2 R1 R2 C1 R3 C3
Parameter bps
R1 22 k 68 k 39 k 39 k
R2 22 k 68 k 39 k 39 k
R3 22 k 68 k 39 k 39 k
C1 0.015 F 2700 pF 1500 pF 1200 pF
C2 0.027 F 4700 pF 3300 pF 2200 pF
C3 6800 pF 820 pF 820 pF 560 pF
fc (Hz) 350 800 1.7 k 2.3 k
512 1200 2400 3200 (6400)
For 4 levels Note on operation : Measures for the prevention of electrostatic breakdown should be taken to handle this IC. --14--
CXA1999N
Example of Representative Characteristics
RF input level vs. Audio response, RSSI characteristics for 1.6 kHz SIN signal
S+N+D 0
1000
RSSI 10 800 RF 20 LO 30 21.7MHz 4.8k Dev. 1.6k AUDIO Matching circuit is used 21.245MHz -10dBm
600
400
VCC: 1.4V 0dB=50mVrms Data filter 2.3 kHz 40 N 50 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 RF input level (dBm) 0 200
Filter constants of the graph above
2200P 39k DET OUT 39k 39k 11 12 LPF OUT
1200P
560P
fc: 2.3kHz
--15--
RSSI output voltage (mV)
Audio response (dB)
CXA1999N
Example of Representative Characteristics
RF input level vs. Audio response, RSSI characteristics for 600 Hz SIN signal
S+N+D 0
1000
RSSI 10 800 RF 20 LO 30 21.7MHz 4.5kHz Dev. 600Hz AUDIO
600
Matching circuit is used 21.245MHz -10dBm
0dB=50mVrms Data filter 800 Hz
400
40 N 50 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 RF input level (dBm)
200
0
Filter constants of the graph above
4700P 68k DET OUT 68k 68k 11 12
2700P
820P
fc: 800Hz
--16--
RSSI output voltage (mV)
Audio response (dB)
CXA1999N
Supply voltage vs. Current consumption
1.4
Current consumption (mA)
1.3
1.2
1.1
1.0
0.9
0.8 1.0
1.5
2.0
2.5 Supply voltage (V)
3.0
3.5
4.0
Local input level vs. Mixer gain 20 With IF filter load RF21.7 MHz -60 dBm Matching circuit provided Level difference between Pin 20 and Pin 3
10
Mixer gain (dB)
0
-10
-20
-30
-20
-10
0
Local input level (dBm) Level comparator
Comparator output voltage (V)
1.4
1.0
0.6
0.2 0 170 200 220 250 270 Comparator input voltage (mV)
--17--
CXA1999N
NRZ comparator
Comparator output voltage (V)
1.4
1.0
0.6
0.2 0 160 180 200 220 240 260 280 Comparator input voltage (mV) 70
Detector output level temperature
Detector output level (mVrms)
60
50
40
30
-25 Level comparator temperature vs. Threshold level 100 : HL : LH
0
25 Temperature (C)
50
75
Threshold level -210 mV (mV)
50
0 -25 0 25 50 75 Temperature (C)
-50
-100
--18--
CXA1999N
Package Outline
Unit : mm
20PIN SSOP (PLASTIC)
6.5 0.1 + 0.2 1.25 - 0.1 0.1 20 11 A
4.4 0.1
1
10 0.65
b
0.13 M
+ 0.05 0.15 - 0.02
(0.22) 0.1 0.1
b=0.22 0.03
0.5 0.2
DETAIL B : SOLDER
(0.15)
DETAIL B : PALLADIUM
NOTE: Dimension "" does not include mold protrusion. 0 to 10
PACKAGE STRUCTURE
DETAIL A
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-20P-L01 SSOP020-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--19--
+ 0.03 0.15 - 0.01
+ 0.1 b=0.22 - 0.05
6.4 0.2

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