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CXA3068N
L-band Down Converter for Satellite Tuner
Description The CXA3068N is a monolithic IC to down-convert the L-band (930 to 2150 MHz) signal for the satellite broadcasting receiver. It has a double-balanced mixer, local oscillator circuit and IF amplifier on chip. Features * Balance-type Colpitts oscillator circuit provides a stable and wide range oscillation. Oscillation frequency : 2.63 GHz * Small leak of the local oscillation signal due to the double-balanced mixer. * Oscillation frequency drift is small, caused by the change of impedance at the pre-stage of RF input. * * * * Local oscillator output circuit for PLL. Single 5 V power supply operation. Low current consumption. ICC=53 mA (typ.) 16-pin SSOP package contributes to reduction in set size. 16 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25 C) * Supply voltage VCC -0.3 to +5.5 V * Storage temperature Tstg -55 to +150 C * Allowable power dissipation PD 625 mW (When mounted on board) Operating Conditions * Supply voltage * Ambient temperature
VCC Topr
4.75 to 5.3 V -20 to 75 C
Applications * Satellite broadcasting tuners for BS, CS, DSS and DVB. (Frequency conversion to the second IF) Structure Bipolar silicon monolithic IC
OSCOUT1
Block Diagram and Pin Configuration
OSCB1 OSCB2 GND1 VCC1 NC NC GND1
10
16
15
14
13
12
11
9
OSC BUFF
IF AMP
MIX
1
IFOUT
2
VCC2
3
GND2
4
GND2
5
RFIN1
6
RFIN2
7
GND1
8
OSCOUT2
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--
E95Z07-TE
CXA3068N
Pin Description and Equivalent Circuit Pin No. Symbol Typical pin voltage (V) Equivalent circuit
VCC2
Description
2
1
IF OUT
2.5
1
IF output.
2 3 4
VCC2 GND2 GND2
5.0 0 0
IF block power supply. IF block GND. IF block GND.
5
RF IN1
1.8
5
2k 2k
6
RF input. Normally, a decoupling capacitor is connected at Pin 5 to GND and Pin 6 is used for input.
6
RF IN2
1.8
7
GND1
0
VCC1
RF block GND.
16
8
OSC OUT2
3.5
9
40 40
Local oscillation output.
8
9
OSC OUT1
3.5
--2--
CXA3068N
Pin No. 10
Symbol GND1
Typical pin voltage (V) 0
Equivalent circuit
Description RF block GND.
11
OSC B2
2.4
14 11
12
NC
-- Oscillator.
13
NC
--
2k
2k
14
OSC B1
2.4
15 16
GND1 VCC1
0 5.0
RF block GND. RF block power supply.
--3--
CXA3068N
Electrical Characteristics (Ta=25 C, VCC=5 V, refer to the Electrical Characteristics Measurement Circuit.) Input frequency: 950 to 2150 MHz No Item 1 Current consumption 2 Conversion gain 1 Measurement conditions No signal fin = 950 MHz, fIF = 480 MHz fin = 1450 MHz, fIF = 480 MHz fin = 2150 MHz, fIF = 480 MHz fin = 950 MHz, fIF = 480 MHz fin = 1450 MHz, fIF = 480 MHz fin = 2150 MHz, fIF = 480 MHz fOSC = 1430 to 1830 MHz fOSC = 1830 to 2230 MHz fOSC = 2230 to 2630 MHz fIF = 480 MHz fOSC = 1430 to 1830 MHz fOSC = 1830 to 2230 MHz fOSC = 2230 to 2630 MHz fOSC = 1430 to 1830 MHz fOSC = 1830 to 2230 MHz fOSC = 2230 to 2630 MHz Pin = -25 dBm fin = 950 MHz + 960 MHz IM3 fout = 470 MHz + 480 MHz S/I of 460 MHz and 480 MHz fOSC=1430 MHz, offset 10 kHz CN1 fOSC=1430 MHz, offset 100 kHz CN2 IFVSWR f = 480 MHz f = 950 MHz r C Symbol ICC CG1 CG2 CG3 NF1 NF2 NF3 POSC1 POSC2 POSC3 PO (sat) RFLK1 RFLK2 RFLK3 IFLK1 IFLK2 IFLK3 Min. Typ. Max. 31.0 53.0 75.0 16 19 23 18 21 25 19 22 26 16 19 14 16 14 16 -10 -6 -10 -6 -11 -7 5.5 8.5 11.0 -20 -20 -20 -20 -32 -32 Unit mA dB dB dB dB dB dB dBm dBm dBm dBm dBm dBm dBm dBm dBm dBm
3 Noise figure 1, 2
4 Local oscillation output 5 IF maximum output 6 RF pin local oscillation leakage IF pin local oscillation leakage Third-order intermodulation distortion 1, 3
7
8
45.0
dB
Local oscillation phase noise 10 IF output VSWR 9 11 RF input impedance
74 95 1.2 140 5
dBc/Hz dBc/Hz pF
1) Measured value for untuned inputs. 2) Noise figure is uncorrected for image. 3) Measure S/I of the desired intermediate frequency (480 MHz) and distortion component (460 MHz) with a spectrum analyzer, assuming input level of the reception frequency to be -25 dBm (when IC input pin is converted for 50 ).
--4--
Electrical Characteristics Measurement Circuit
VC
1T379 1T379
20k
10k 10k
1n
1n
+5V 16 15 14 13 12 11 10
47p
47p
9
OSCOUT2 OSCOUT1
NC
VCC1
GND1
NC
OSCB1
CXA3068N
OSCB2
IF OUT
1
VCC2
2
GND2
3
GND2
4
RFIN1
5
RFIN2
6
7
GND1
GND1
1n
1n
100p
100p
1n
CXA3068N
IFout
6P
--5--
RFin
8
LOout
CXA3068N
Description of Operation (Refer to the Electrical Characteristics Measurement Circuit.) 1) Oscillator circuit The oscillator circuit is formed with two Colpitts oscillators, and oscillation is provided at the differential input via an LC resonance circuit including a varicap diode. This is oscillated only by attaching an LC resonance circuit externally because feedback capacitance, etc. are built in for oscillation. 2) Mixer circuit This is a double-balance mixer having small leak of local oscillation signal. The RF signal is input to Pins 5 and 6. In normal use, the signal is input to one pin while the other pin is connected to GND via decoupling capacitor. 3) IF amplifier circuit The mixer output signal is amplified by the IF amplifier and output to Pin 1. The IF output is emitterfollower output and output impedance is approximately 50 (480 MHz). 4) PLL oscillation signal output circuit The output circuit is built in to drive the PLL for tuning. This is emitter-follower output and output impedance is approximately 50 .
--6--
CXA3068N
Current consumption vs. Supply voltage
Conversion gain vs. Reception frequency (untuned input) 25 fIF = 480MHz
Current consumption [mA]
60 20 55
Conversion gain
4.7 5.0 Supply voltage [V] 5.3
15
50
45
10
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
Reception frequency [GHz]
Noise figure vs. Reception frequency (untuned input, in DSB) 24 fIF = 480MHz 20
Local oscillation output level vs. Local oscillation frequency +5
Local oscillation output level [dBm]
0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
0
Noise figure [dB]
16
-5
12
-10
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
Reception frequency [GHz]
Local oscillation frequency [GHz]
--7--
CXA3068N
IF pin local oscillation leak vs. Local oscillation frequency -20
RF pin oscillation frequency leak vs. Local oscillation frequency -20
-30
RF pin oscillation frequency leak [dBm]
1.6 1.8 2.0 2.2 2.4 2.6 2.8
IF pin local oscillation leak [dBm]
-30
-40
-40
-50
-50
-60
-60
1.4
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
Local oscillation frequency [GHz]
Local oscillation frequency [GHz]
Input/output characteristics (untuned input) +10 0 -10 = Fundamental-frequency (480MHz) = Third-harmonics (470MHz)
IF output level [dBm]
-20 -30 -50 -40 -60 -70
-50
-40
-30
-20
-10
0
RF input level [dBm] (935MHz, 940MHz)
--8--
CXA3068N
Input Impedance
2150MHz
j50
j25
j100 j150
j10
j250
0
50
-j10
-j250
-j150
5
1450MHz -j25 -j100 S11
6
7
8
-j50 950MHz
--9--
CXA3068N
Output Impedance (IF)
j50 400MHz
j25 480MHz
j100 j150
j10
j250
0
50
-j10
-j250
-j150
1
-j25 -j100 S11
2
3
-j50
Output Impedance (local oscillation output)
j50
j25 2630MHz
j100 j150
j10
j250
0
50
-j10
-j250 11 -j150 10
9
6
-j25 -j100
7
8
-j50
S11 1430MHZ
--10--
CXA3068N
Package Outline
Unit : mm
16PIN SSOP (PLASTIC)
5.0 0.1 + 0.2 1.25 - 0.1 0.1 16 9 A
4.4 0.1
1 + 0.1 0.22 - 0.05
8 0.65 0.12 + 0.05 0.15 - 0.02
0.1 0.1
0 to 10 DETAIL A NOTE: Dimension "" does not include mold protrusion.
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SSOP-16P-L01 SSOP016-P-0044 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER / PALLADIUM PLATING COPPER / 42 ALLOY 0.1g
--11--
0.5 0.2
6.4 0.2

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