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CXA1695L
All Band TV Tuner IC (VHF-CATV-UHF)
Description
The CXA1695L is a single chip TV tuner IC which performs as an oscillator, mixer for VHF/CATV and UHF bands. An IF amplifier is also provided. This IC achieves a large reduction of external parts in addition to miniaturizing the tuner and increasing manufacturing productivity, reliability and design efficiency. This IC is pin-compatible with the CXA1594L with improvement in noise figure and oscillation stability. 16 pin SZIP (Plastic)
Structure
Bipolar silicon monolithic IC
Features
* On-chip oscillator and mixer for UHF band * Low noise figure * Reduced spurious interference * Superior cross modulation * Stable oscillation characteristics * Ultra small package ensures tuner miniaturization
Absolute Maximum Ratings (Ta=25 C)
* Supply voltage Vcc 11 V * Storage temperature Tstg -55 to +150 C * Allowable power dissipation PD 930 mW (when mounted on board)
Applications
* CTV tuner * CATV UP-DOWN converter
Operating Conditions
* Supply voltage Vcc * Operating temperature Topr 8.1 to 9.9 -20 to +75 V C
Block Diagram and Pin Configuration
VHF MIX
UHF MIX
- IF AMP +
VHF OSC SW V REG UHF OSC
1
IF OUT
2
VHF IN 1
3
MIX OUT 1
4
VHF IN 2
5
MIX OUT 2
6
GND
7
SW
8
Vcc
9
V OSC B
10
11
12
13
14
15
16
UHF IN 1
UHF IN 2
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--
U OSC B2
E92Y29A51-TE
U OSC B1
V OSC C
U OSC C
GND
CXA1695L
Pin Description and Equivalent Circuit
Pin No. 1 Symbol IF OUT Typical pin voltage (V) Under VHF operation 4.4 Equivalent circuit
Vcc
Description IF output.
8
55
Under UHF operation 4.4
1
2
VHF IN 1
3.2 3.3
2
3k 3k
4
4
VHF IN 2
3.2
VHF input. Normally a decoupling capacitor is connected at pin 2 to GND and pin 4 is used for input.
3.3 3 MIX OUT 1 7.5
8
Vcc 450 450 5k
Mixer output and IF amplifier input.
7.2
3
5
MIX OUT 2
7.5
5
5k
7.2
6 7
GND SW
0 3V or more
8
Vcc
GND UHF/VHF switch pin. Connect 9V source through about a 10k resister for VHF reception; 0V or leave open for UHF.
60k
0.4V or less
40k
7
--2--
CXA1695L
Pin No. 8 9
Symbol Vcc V OSC B
Typical pin voltage (V) 9.0 3.5
Equivalent circuit
Description Power supply VHF oscillator.
Vcc
8
3.7
11
800
9
11 V OSC C
6.7
3k
3k
25p
9.0
10 UHF IN 1
3.3
3.1
10 3k 3k 12
UHF input. The balanced input to Pins 10 and 12, or a decoupling capacitor is connected at Pin 12 to GND and Pin 10 is used for input.
12 UHF IN 2
3.3
3.1
13
GND
0 9.0 6.5
800 Vcc
GND UHF oscillator.
8
14 U OSC C
15 U OSC B2
3.6 3.4
14 16 3k 3k 15
16 U OSC B1
3.6 3.4
--3--
CXA1695L
Electrical Characteristics
Item Circuit current Conversion gain 1 Symbol IccV IccU CG1 CG2 CG3 CG4 NF1 NF2 NF3 NF4 CM1 CM2 CM3 CM4 Max. output power Pomax (sat) fsw1 fsw2 fsw2 fsw4 fst1 +B supply voltage drift fst2 fst3 fst4
See Electrical Characteristics Test Circuit (Ta=25C, VCC=9V) Measurement conditions Min. Typ. 45.0 45.0 20.5 21.0 26.0 27.0 9.5 10.0 6.0 7.0 99.0 97.0 90.0 90.0 Max. 58.0 58.0 23.5 24.0 29.0 30.0 12.5 13.0 10.0 11.0 Unit mA mA dB dB dB dB dB dB dB dB dB dB dB dB dBm 300 400 600 700 200 300 400 400 kHz kHz kHz kHz kHz kHz kHz kHz
Noise figure 12
1% cross modulation 13
VHF operation, no signal UHF operation, no signal VHF operation, fRF=55 MHz, input level -40 dBm VHF operation, fRF=360 MHz, input level -40 dBm UHF operation, fRF=360 MHz, input level -40 dBm UHF operation, fRF=800 MHz, input level -40 dBm VHF operation, fRF=55 MHz VHF operation, fRF=360 MHz UHF operation, fRF=360 MHz UHF operation, fRF=800 MHz VHF operation, fD=55 MHz fUD=12 MHz VHF operation, fD=360 MHz fUD=12 MHz UHF operation, fD=360 MHz fUD=12 MHz UHF operation, fD=800 MHz fUD=12 MHz 50load VHF operation, fosc=100 MHz Frequency drift from 3 s to 3 min. after switch ON VHF operation, fosc=405 MHz Frequency drift from 3 s to 3 min. after switch ON UHF operation, fosc=405 MHz Frequency drift from 3 s to 3 min. after switch ON UHF operation, fosc=845 MHz Frequency drift from 3 s to 3 min. after switch ON VHF operation, fosc=100 MHz Frequency shift when VCC +9 V changes 5 % VHF operation, fosc=405 MHz Frequency shift when VCC +9 V changes 5 % UHF operation, fosc=405 MHz Frequency shift when VCC +9 V changes 5 % UHF operation, fosc=845 MHz Frequency shift when Vcc +9 V changes 5 %
17.5 18.0 23.0 24.0
95.0 93.0 86.0 86.0
+8.0 +12.0
Switch ON drift
1) Measured value for untuned inputs. Unbalanced input for VHF; balanced input for UHF. 2) Noise figure is uncorrected for image. 3) Desired signal (fD) input level is -34 dBm. Undesired signal (fUD) is 100 kHz at 40 %AM. The measurement value is undesired signal level, it measured with spectrum analyzer at S/I=46 dB.
--4--
Electrical Characteristics Test Circuit
+9V VHF in UHF in 0.5p(SL)
51k
1T363
2T
2T
51k
1n
1n
1n
1n
1n
27p 20 1T363
8p(UJ) L1
27p
Vc
2
10 12 14 16
4
Vcc VHF IN 2 GND UHF IN 1 UHF IN 2 U OSC C U OSC B1
6
8
VHF IN 1
0.5p(SL)
CXA1695L
MIX OUT 1 MIX OUT 2 V OSC C IF OUT SW V OSC B GND U OSC B2
1
3.6k 100p 11 13 15
3
10
5
7
9
1n
10p
68p
68p
1.2H
16p
1p(UK)
IFout 10T
10
10k
1T362
0.5p(UK)
51k
51k
ON : VHF OFF: UHF
1n
Vc
51k
L2
68p(RH)
+9V
SW 1
1T363
2.2
VH
SW2
1n
51k
51
+9V
L3
1n
Wire diameter Coil diameter Number of windings L1 0.5 3.2 1.5T L2 0.5 3.4 2.5T L3 0.5 3.2 5.5T
1n
3k
CXA1695L
51
2.2
VL
2.2
51k
--5--
CXA1695L
Description of Operation (See Electrical Characteristics Test Circuit)
(1) VHF oscillator circuit The differential oscillator circuit with Pin 11 output and Pin 9 input. Connect an LC resonance circuit comprising a varicap diode to Pin 11 through a coupling capacitor. The positive feedback from the resonance circuit is applied to Pin 9 through a feedback capacitor to execute oscillation. Note that if a parasitic capacitance across Pins 9 and 11 is too large, it may cause undesired oscillation. (2) VHF mixer circuit This is a double-balanced mixer having small leakage of local oscillation signal. The RF signal input terminal are Pins 2 and 4. In normal use, the signal is input to one pin while the other pin is connected to GND by decoupling capacitor. The RF signal is converted to IF with the signal supplied from oscillator. The converted RF is sent to the IF amplifier and output to Pins 3 and 5 simultaneously. (3) UHF oscillator circuit This is the differential oscillator same circuit as the VHF oscillator. In Electrical Characteristics Test Circuit, oscillation is executed as a Colpitts oscillator using one side transistor of the differential amplifier. (4) UHF mixer circuit This is the double-balanced mixer same circuit as the VHF mixer. The RF signal input terminal are to Pins 10 and 12.These are used balanced differential input from pre-stage double tune circuit, or an unbalanced input to Pin 10 with the capacitor connected at Pin 12 to GND. Balanced input achieves better NF rather than unbalanced input. Otherwise, the conditions and usage are the same as for the VHF mixer. (5) IF amplifier circuit The mixer output signal is amplified by the IF amplifier and output to Pin 1. The output impedance is approximately 75. (6) UHF/VHF switching circuit UHF / VHF modes are switched by the DC voltage at Pin 7. UHF operation is for open or 0V; VHF operation, for 3V or more. Normally, for internal protection UHF/VHF switch is performed by 9V or open through about 10k resistor.
Notes on Usage
Care should be taken in placing external parts because high frequencies are present. Adjust accordingly to prevent heat problems with special care for Pins 6 and 13 (GND) whose heat dissipation accumulate.
--6--
CXA1695L
Example of Representative Characteristics
Circuit current vs. Sup p ly voltage Conversion gain vs. Recep tion frequency (Untuned inp ut)
40
fIF=45MHz
CG - Conversion gain (dB)
50
Icc - Circuit current (mA )
30
UHF
40
20
VHF
10
30 0 8 9 10 0 100 200 300 400 500 600 700 800 900
V cc - Sup p ly voltage (V ) Noise figure vs. Recep tion frequency (Untuned inp ut, in DSB)
fIF=45MHz
Recep tion frequency (MHz) Next adjacent cross modulation vs. Recep tion frequency (Untuned inp ut)
120
20
CM - Cross modulation (dB)
100
NF - Noise figure (dB)
15
80 fUD=fD+12MHz fUD=fD-12MHz 60
10 VHF UHF
40 fIF=45MHz Interference signals:100kHz 40% AM 20
5
0 0 100 200 300 400 500 600 700 800 900
0
100 200 300 400 500 600 700 800 900
Recep tion frequency (MHz) I/O characteristics (Untuned inp ut)
20 10
Recep tion frequency (MHz)
IF outp ut level (dBm)
0 -10 -20 -30 -40 -50 fIF=45MHz fRF=100MHz (VHF)
-50
-40
-30
-20
-10
0
+10
RF inp ut level (dBm)
--7--
CXA1695L
VHF Input Impedance
j25
j50
j100 j150
j10
j250
0
50
50MHz 100MHz 200MHz
-j10
-j250 400MHz -j150 VHFIN1 -j25 -j100
IC
VHFIN2
2
1n
3
4
S11
5
6
-j50
UHF Input Impedance
j25
j50
j100 j150
j10
j250
0
50
-j10 800MHz
-j250 400MHz 600MHz -j150 UHFIN1
IC
UHFIN2 10 S11 11 12 1n
8
-j25 -j100
9
-j50
--8--
CXA1695L
IF Output Impedance
j50
j25
j100 j150
j10 60MHz
j250
50MHz 0 40MHz 50
-j10
-j250
-j150
-j25
-j100
-j50
--9--
CXA1695L
Package Outline
Unit : mm
16PIN SZIP (PLASTIC) 225mil
+ 0.4 14.0 - 0.1
2.2 0.2
+ 0.3 4.35 - 0.1
1 0.4 0.1 0.25 M
16 0.889
0 to
8
+ 0.1 0.2 - 0.05
1.778
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SZIP-16P-01 SZIP016-P-0225-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING COPPER ALLOY 0.3g
--10--
3.1
SEATING PLANE
5.715 MAX

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