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Video ICs
VIF / SIF signal processor
BA7357S
The BA7357S is a multi-format (M, B / G, D / K, and I) VIF / SIF signal processor for television and VCR applications. It features a built-in sound-trap and band-pass filters, and employs a pulse-count audio detector that does not require adjustment. This IC reduces external component requirements, and allows space savings.
*Applications TVs and VCRs *Features 1) Separate-carrier PLL with full synchronous detec2) 3) tion. Excellent DG / DP, CS beat (920kHz) and cross color. In addition, by pulling down the SIF input (pin 9) it can be used as an intercarrier. The IF AGC time constant is dual-layered to allow faster speeds. The variable-gain amplifier has excellent linearity to ensure low distortion, and AGC variance and temperature drift have been minimized. Significant improvement in image quality through use of a filter that reduces CS beat. Built-in SOUND filter (4.5MHz SOUND Trap and 4.5MHz SOUND BPF). The MODE switch can be used to switch the SOUND filter frequency band to match the transmission format (M: 4.5, B / G: 5.5, I: 6.0, D / K: 6.5MHz). 6) The audio detector uses a pulse-counter detector that does not require adjustment, eliminating the need for a detector coil. Broad S-curve for multiplex broadcast compatibility. 7) Use of pulse-counter detection and the built-in SOUND filter means fewer pins, external components and adjustment locations are required. The IC is available in a 22-pin SDIP package and will enable cost and space savings.
4) 5)
*Absolute maximum ratings (Ta = 25C)
Parameter
Applied voltage Power dissipation Operating temperature Storage temperature Pin 2 applied voltage
Symbol VCCMax. PdMax. Topr
Limits 10.51 12502 - 15 ~ + 70 - 40 ~ + 150 10.5
Unit V mW C C V
Tstg
VP2Max.
1 24 resistor connected between VCC and Vreg. 2 Reduced by 10mW for each increase in Ta 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter
Power supply voltage (9V) Power supply voltage (12V) Guaranteed operating power supply voltage
Symbol VCC9V VCC12V VCC
Limits 8.8 ~ 9.21 11.7 ~ 12.32 8.5 ~ 9.51
Unit V V V
1 24 resistor connected between VCC and Vreg. 2 56 resistor connected between VCC and Vreg. 1
Video ICs
BA7357S
*Block diagram
AFTOUT 1 22 EQFLT
B/W INV
RFAGC
2
EQ AMP
21
VEQO
AGCADJ
3
RF AGC
VIDEO AMP
20
PLLFLT
IF AGC
SIF TRAP
AFT
AGCFLT
PLL DET
4
19
AFTCOIL
GND1
5
18
Vreg
+ 45 SHIFT
VIFB
6
- 45 SHIFT
17
PLLCOILA
VIF AMP
VIF AMP
VIF AMP
GND2
8
MODE
BIAS
SIF SW
Vreg
VIFA
VCO
7
16
PLLCOILB
15
MODE
SIF AMP
SIF BPF
SIF
9
REF OSC
14
X5
FM DEMOD
AF AMP
LIM
LIM
VO4.5M
11
500k BPF
AFC
10
13
AFOUT
12
IR
2
Video ICs
BA7357S
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Pin name Function
AFTOUT RFAGC AGCADJ AGCFLT GND1 VIFB VIFA GND2 SIF AFC VO4.5M IR AFOUT X5 MODE PLL COIL B PLL COIL A Vreg AFT COIL PLL FLT VEQO EQFLT
AFT OUT RF AGC OUT
RF AGC delay point adjustment
IF AGC FILTER VIF, BIAS GND VIF B IN VIF A IN SIF, PLL GND
SIF IN / intercarrier SW AUDIO detector Filter and A / V mute SW
2nd SIF OUT
FIilter BIAS resistor ( 1%)
AUDIO OUT
Filter system reference frequency oscillator
MODE SW
PLL oscillator COIL PLL oscillator COIL
Vreg AFT COIL
PLL phase detect filter VIDEO OUT after EQ amplifier
EQ Filter
3
Video ICs
BA7357S
*Equivalent circuits
Pin No. Pin name IN / OUT Standard voltage Equivalent circuit
VCC 500
Function AFT output. Vreg / GND push-pull output.
1k
1
AFTOUT
OUT
--
1
500 GND
VCC 4k
2
RFAGC
OUT
--
2
RFAGC output. Open-collector output. Gain can be set using an external resistor (minimum value of the maximum sink current of pin 2 is 0.7mA) . Keep the pin 2 voltage at 10.5V or less.
GND
VCC
3
AGCADJ
--
2.7V (when 100k resistor connected)
3 1k
RFAGC delay point adjustment. Connect to GND via a variable resistor (approx. 100k).
4.5k
4k
25.2k GND
VCC 400
For filter time constant for VIFAGC.
4
AGCFLT
--
5.0V
4
GND
5
GND1
--
0V
--
GND terminal for VIF, AGC and AFT.
VCC and VCC2 in the equivalent circuit diagrams are connected to the Vreg terminal (pin 18).
4
Video ICs
BA7357S
Pin No. Pin name IN / OUT Standard voltage
Equivalent circuit
VCC
Function Video IF input. Use with balanced input.
1k
1k
6 7
VIFB VIFA
5
IN
4.2V
7 5.3k 1k GND 5.3k
8
GND2
--
0V
--
VCC 15k
SIF and PLL GND.
20k
Audio IF input. Can set to intercarrier mode by pulling down via a 2k resistor.
9
9
SIF
IN
6.6V
17pF
15k GND
VCC
3.5V
10
AFC
--
2.7V
10 40k
Terminal for holding the audio output DC level fixed. Connect to GND via a 4.7F capacitor and to Vreg via a 10F capacitor to reduce BUZZ. Set this pin to 0.3V or lower to apply Audio / Video Mute.
GND
VCC
11
Sound Filter 8k
11
VO4.5M
--
5.2V
2nd SIF output. Connect a Trap to this pin to vary the Sound Filter characteristics. The internal impedance is a high (Approximately) 1k, so connect a Buffer to output.
GND
5
Video ICs
BA7357S
Pin No. Pin name IN / OUT Standard voltage
Equivalent circuit
VCC 64k
Function Reference current source for adjusting the internal filter. Use connected to GND via a 24k resistor. Use an accurate resistor with good temperature characteristics (e.g. 1% metal film).
12
IR
--
2.4V
12 500
18.7k
0.85p GND
VCC 200
Audio signal output. The standard output in the case of B / G is 520mVrms (when f = 50kHz). Connect to GND via a 10k resistor.
13
AFOUT
OUT
3.2V
13 27k GND
VCC 200
14
X5
--
5.0V
14
400
For connection to a 5MHz oscillator (when M format is used). Use as a reference oscillator for automatic adjustment of the internal filter, and as the signal for the SIF signal low frequency conversion. (B / G, D / K format: 6MHz, I format: 6.5MHz).
GND
VCC 40k
Input terminal for Trap filter SW. 0V: M format (4.5MHz) 2.4V: D / K format (6.5MHz) 4.3V: I format (6.0MHz)
5k
15
MODE
IN
3.4V
15
50k 5k
Vreg: B / G format (5.5MHz)
40k GND
6
Video ICs
BA7357S
Pin No. Pin name IN / OUT Standard voltage
Equivalent circuit
VCC
Function For connection of IF detector VCO oscillator coil.
1k
1k
200
16 17
PLLCOILA -- PLLCOILB 3.6V
16 17
GND
18
IF circuit power supply. Pin 18 has a built-in shunt regulator.
VIF SIF
18
Vreg
--
6.6V
GND2
VCC2 17k 17k 11k 1.5k 1.5k
For connection of AFT coil. To apply AFT defeat, connect to GND via a 1k (approx.) resistor.
19
AFTCOIL
--
3.0V
19
3.9k
3.9k GND2
VCC2 500
Terminal for time constant circuit for the PLL filter.
3.3V
20
PLLFLT
--
3.4V
20 30k 148k
40k
500
GND2
7
Video ICs
BA7357S
Pin No. Pin name IN / OUT Standard voltage
Equivalent circuit
VCC 250 250
Function VIDEO output. Output is via the Sound Trap, B / W noise inverter, and EQ amplifier. Connect to GND via a 4.7k resistor.
21
VEQO
OUT
2.0V (SYNC)
21
27k
GND
VCC 250 250
EG Filter. Connect to GND via an LCR series resonant circuit. R should be 1k.
22
EQFLT
--
5.2V
22
1k 1k 1k
GND
8
Video ICs
BA7357S
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 9V, and P = 38.9MHz)
Parameter Vreg
Supply current Regulated voltage
Symbol
Min.
Typ.
Max.
Unit
Conditions
ICC Vreg
--
96 6.6
110 7.0
mA V
6.2
VIF
Input sensitivity Maximum allowable input level AGC range Quiescent video output voltage Video detector output level Synchronous signal tip voltage Video output DG Video output DP Sound trap attenuation CS beat level Video output S / N White noise threshold voltage White noise clamping voltage Black noise threshold voltage Black noise clamping voltage RFAGC maximum sink current
VVMin. VVMax. GR VP21 VVO VP21SY DG DP M, B / G D / K, I GVOS I920 S / NV VWTH VWCL VBTH VBCL IP2SI
34 100 62 3.9 1.7 1.7
-- --
40 110 70 4.3 2.0 2.0 2 3 45 45 50 53 5.0 3.0 1.4 2.9 1.2
46
-- --
dB dB dB V VP-P V % deg dB dB dB V V V V mA
VVO = - 3dB point VVO = + 1dB point VVO = 3dB range No signal, VP4 = Vreg Vi = 80dB, AM87.5%MOD 100% white video signal Vi = 80dB, AM87.5%MOD 3STEP video signal 20 LOG (VOS / VO0.2M) P = 0, P / C = 4, P / S = 14dB Vi = 90dB, 100% white CW = 70dB frequency variation and pin 21 voltage variation
4.7 2.4 2.3 8 8
-- -- -- --
33 28 37 47 4.7 2.9 1.1 2.6 0.7
5.3 3.5 1.7 3.2
--
CW = 100dB, AGCADJ = 100K
AFT
Maximum AFT voltage Minimum AFT voltage AFT detection sensitivity AFT defeat starting voltage AFT defeat voltage
VPIMax. VPIMin. Sf VAFTDET VIDEF
6.0
--
6.4 0.3 65
--
--
V V
CW = 38.4MHz CW = 39.4MHz
0.8
--
35
--
mV / kHz CW frequency variation V V
CW = 38.4MHz CW = 38.4MHz
1.2 3.6
2.9
3.3
PLL
PLL capture range 1 PLL capture range 2 PLL lock range 1 PLL lock range 2 VCO control sensitivity
fCU fCL fLU fLL
0.5 -- 0.6 -- 0.5
+ 0.9 - 0.9 + 2.0 - 2.0 1.3
-- - 0.5 -- - 0.6 --
MHz MHz MHz MHz kHz / mV
CW = 80dB frequency variation
9
Video ICs
BA7357S
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions fm = 400Hz, f = 50kHz
5% distortion
SIF P = 38.9MHz / 80dB S = 33.4MHz / 70dB - 12dB (SAW Filter Loss)
Input sensitivity SIF maximum allowable input level FM detector output level Audio output S / N Audio output distortion AMR MUTE video output voltage MUTE audio output voltage MUTE start voltage Intermode switch voltage VO4.5M output level
VSMin. VSMax. VSO SNAF THD AMR VVMUTE VSMUTE VIOMUTE V9INT VVO4.5M
-- 80 350 52 -- 40 -- 2.3 -- 0.1 10
24 90 520 64 0.3 56 0.7 2.9 -- -- 20
33 -- 700 -- 1.5 -- 1.2 3.5 0.3 1.0 40
dB dB mVrms dB % dB V V V V mVP-P
fm = 400Hz, f = 50kHz fm = 400Hz, f = 50kHz fm = 400Hz, f = 50kHz f = 25kHz, AM30% VPIO = GND VPIO = GND
Intermode P = 80dB, P / S = 20dB (use FET probe)
MODE
MODE voltage (M) MODE voltage (B / G) MODE voltage (D / K) MODE voltage (I)
V15M V15BG V15DK V15I
-- 6.0 2.20 4.10
0 Vreg 2.40 4.30
0.5 -- 2.60 4.50
V V V V
REF - OSC = 5MHz REF - OSC = 6MHz REF - OSC = 6MHz REF - OSC = 6.5MHz
10
BA7357S
Vcc (9V)
M (7.5k) 1.3V 100 1k 1k
5.1k
AFOUT
2k
18p
18p
47p
PLL COIL 0.033 SWG 27 6.5M 1 2 3 0.1 47 20 AFT COIL PLL COILA PLLFLT Vreg 19 18 17 16 PLL COILB 15 MODE SWF
22p
2 1
Vcc (9V)
39H
6M
5M 105A 2 1 SWE 14 X5 13 AFOUT 12 IR 3 2
4.7k
2 0.68 SWH
1
150
AFT COIL
95A
1
SWD
22 EQFLT VEQ0
21
24.0k ( + - 1% )
0.01
AGCADJ
AFTOUT
AGCFLT
1 Vcc
2
3
4
5
6 0.01 100k 5.1k 0.01 2.2 SWA
7
8
9
10
11
VO4.5M
RFAGC
GND1
GND2
VIFB
VIFA
AFC
SIF
Vreg 220k
SWB 1:1 2 1 2 0.01
SWC 1 10
VO4.5M
*Measurement circuit
0.01 220k
Video ICs
2
1 0.01 AFT OUT RF AGC
0.01 SAWF VG SAW FILTER LOSS 12dB 0.01 V9
Fig. 1
11
Video ICs
BA7357S
Vreg 4.7k D / K SW 2.7k VCC (9V) ALL OFF B / G 100 AFT DEF SW 10p 22p 1k M (7.5k) 5.1k RFOUT AFT VCC (9V) 39p 6.5M MODE 24 0.1 47 6M 0.01 X5 17 16 15 14 13 12 10p PLL 5M 0.1 IR 0.1 24k (+ - 1%) Vreg 470 VO4.5M 1k Unit R: C: F 1.2k I SW 9V 4.7k VEQ0 4.7k M SW
*Application example
EQFLT 0.68 150 47p39H 4.7k
2k
PLLFLT
1k
+
19
Vreg 20 18
22
21 EQ AMP B/W INV
PLL DET
- 45 SHIFT
VCO
Vreg
MODE
REF OSC
AF AMP FM DEMOD
AFT
+ 45
SHIFT
BIAS
VIDEO AMP
SIF TRAP VIF AMP
SIF SW
SIF BPF
LIM
LIM RF AGC IF AGC VIF AMP VIF AMP 22k SIF AMP
VCC
500k BPF
1
2 4700 100k
3 0.1
4
5 4700
6
7
8 GND2 4700
9 SIF SW
10 AFC 4.7
10k 11
22 / 12V
220k
4700
Vreg
+
GND1
+
220k
VIF IN AGCADJ RF AGC AGCFLT
0.1
SAW FILTER
SIF IN
2k
+
4700
Vreg
AFT OUT
IF IN SIF SW MODE SW SPLIT = FREE / INTER = GND SIF IN [9pin] DC
STANDARD
V / S C SPACING [MHz]
M 4.5 0 5.0
B/G D/K 5.5 6.6 6.0 6.5 2.4 6.0
I 6.0 4.3 6.5
MODE [V] OSC [MHz]
Fig. 2
AT Vreg = 6.6V
12
10
Video ICs
BA7357S
*Coil specifications
f = 38.0MHz 0236 - JPS - 134 Type name: S-7GC f = 38.9MHz 0236 - JPS - 121 Type name: S-7GC
3
4
VCO COIL
S
4-6 8T
3 2 1 4
S
4-6 8T
2 1
0.10
6
0.12
6
Tuning capacitance: 22pF RH SUMIDA
Tuning capacitance: 22pF RH SUMIDA
0236 - JPS - 137 Type name: S-7GC
0236 - JPS - 136 Type name: S-7GC
1-2 2-3 3T 3T AFT COIL
3 2 1 4 3 4
1-2 2-3 3T 3T
0.14
6
2 1
0.10
6
S
Tuning capacitance: 56pF RH SUMIDA
S
Tuning capacitance: 56pF RH SUMIDA
Note: Connect a 16.7pF capacitor between 4 and 6 when measuring in the case of the VCO COIL. Connect a 0pF capacitor between 1 and 3 when measuring in the case of the AFT COIL.
13
Video ICs
BA7357S
*Operation notesaudio and video output muting function (1) Simultaneous
It is possible to simultaneously mute the audio and video output by pulling the AFC filter terminal down. (2) AFT defeat function AFT defeat can be applied by pulling the AFT coil terminal down via a 1k resistor. (3) Recommended SIF input range for intercarrier mode P / S = 20 TO 30dB (including SAWFILTER). (4) IF input range for RFAGC switching 60 TO 95dB. (5) Intercarrier mode switching Intercarrier mode can be set by pulling the SIF terminal down via a 2k resistor. (6) IR terminal external resistor This resistor sets the filter system reference current, so use an accurate component that has good temperature characteristics.
*Electrical characteristic curves
1.5 POWER DISSIPATION: Pd (W) 1.25 1.0 IC is not connected. 1.5 1.4375 POWER DISSIPATION: Pd (W) When mounted on a glass eoxy board. 1.0
0.5
0.5
0
25
50
75
100
125
150
0
25
50
75
100
125
150
TEMPERATURE: Ta (C)
TEMPERATURE: Ta (C)
Fig. 3 Power dissipation
Fig. 4 Power dissipation
14
Video ICs
BA7357S
*External dimensions (Units: mm)
19.4 0.3 22 12 6.5 0.3
0.51Min.
3.4 0.2 3.95 0.3
1
11
7.62
0.3 0.1
1.778
0.5 0.1
0 ~ 15
SDIP22
15

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