Download: VIF / SIF signal processor •Applications •Features

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 detec- The MODE switch can be used to switch the tion. Excellent DG / DP, CS beat (920kHz) and SOUND filter frequency band to match the transmis- cross color. In addition, by pulling down the SIF sion format (M: 4.5, B / G: 5.5, I: 6.0, D / K: input (pin 9) it can be used as an intercarrier. 6.5MHz). 2) The IF AGC time constant is dual-layered to allow 6) The audio detector uses a pulse-counter detector faster speeds. that does not require adjustment, eliminating the 3) The variable-gain amplifier has excellent linearity to need for a detector coil. Broad S-curve for multiplex ensure low distortion, and AGC variance and tem- broadcast compatibility. perature drift have been minimized. 7) Use of pulse-counter detection and the built-in 4) Significant improvement in image quality through SOUND filter means fewer pins, external compo- use of a filter that reduces CS beat. nents and adjustment locations are required. The IC 5) Built-in SOUND filter (4.5MHz SOUND Trap and is available in a 22-pin SDIP package and will 4.5MHz SOUND BPF). enable cost and space savings. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Applied voltage VCCMax. 10.5∗1 V Power dissipation PdMax. 1250∗2 mW Operating temperature Topr – 15 ~ + 70 °C Storage temperature Tstg – 40 ~ + 150 °C Pin 2 applied voltage VP2Max. 10.5 V ∗1 24Ω resistor connected between VCC and Vreg. ∗2 Reduced by 10mW for each increase in Ta 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Symbol Limits Unit Power supply voltage (9V) VCC9V 8.8 ~ 9.2∗1 V Power supply voltage (12V) VCC12V 11.7 ~ 12.3∗2 V Guaranteed operating power VCC 8.5 ~ 9.5∗1 V supply voltage ∗1 24Ω resistor connected between VCC and Vreg. ∗2 56Ω resistor connected between VCC and Vreg., •Block diagram AFTOUT 1 22 EQFLT RFAGC 2 21 VEQO AGCADJ 3 20 PLLFLT AGCFLT 4 19 AFTCOIL GND1 5 18 Vreg VIFB 6 17 PLLCOILA VIFA 7 16 PLLCOILB GND2 8 15 MODE SIF 9 14 X5 AFC 10 13 AFOUT VO4.5M 11 12 IR

VIF

SIF AMP

AMP

500k IF RF BPF AGC AGC

VIF AMP LIM VIF AMP

SIF SIF LIM BPF SW SIF VIDEO TRAP AMP + 45

SHIFT

FM AFT DEMOD BIAS B / W

INV

AF REF – 45 PLL AMP OSC MODE Vreg VCO SHIFT DET

EQ AMP

, •Pin descriptions Pin No. Pin name Function 1 AFTOUT AFT OUT 2 RFAGC RF AGC OUT 3 AGCADJ RF AGC delay point adjustment 4 AGCFLT IF AGC FILTER 5 GND1 VIF, BIAS GND 6 VIFB VIF B IN 7 VIFA VIF A IN 8 GND2 SIF, PLL GND 9 SIF SIF IN / intercarrier SW 10 AFC AUDIO detector Filter and A / V mute SW 11 VO4.5M 2nd SIF OUT 12 IR FIilter BIAS resistor ( ± 1%) 13 AFOUT AUDIO OUT 14 X5 Filter system reference frequency oscillator 15 MODE MODE SW 16 PLL COIL B PLL oscillator COIL 17 PLL COIL A PLL oscillator COIL 18 Vreg Vreg 19 AFT COIL AFT COIL 20 PLL FLT PLL phase detect filter 21 VEQO VIDEO OUT after EQ amplifier 22 EQFLT EQ Filter, •Equivalent circuits Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC AFT output. 500 Vreg / GND push-pull output. 1k 1 AFTOUT OUT —

GND VCC

4k RFAGC output. Open-collector output. Gain can be set using an external resistor (minimum value of the maximum sink 2 RFAGC OUT — 2 current of pin 2 is 0.7mA) . Keep the pin 2 voltage at 10.5V or less.

GND VCC

RFAGC delay point adjustment. Connect to GND via a variable resistor (approx. 100kΩ). 2.7V 4.5k (when 100kΩ 3 AGCADJ — resistor connected) 4k 1k 25.2k

GND

VCC 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)., Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function

VCC

Video IF input. Use with balanced input. 1k 1k 6 VIFB 5 IN 4.2V 7 VIFA 5.3k 5.3k 1k

GND

8 GND2 — 0V — SIF and PLL GND.

VCC

15k Audio IF input. 20k Can set to intercarrier mode by pulling down via a 2kΩ resistor. 9 SIF IN 6.6V 17pF 15k

GND

Terminal for holding the audio VCC output DC level fixed. Connect to GND via a 4.7µF capacitor and to Vreg via a 10µF 3.5V capacitor to reduce BUZZ. 10 AFC — 2.7V Set this pin to 0.3V or lower to 40k apply Audio / Video Mute.

GND VCC

2nd SIF output. Connect a Trap to this pin to vary the Sound Filter characteristics. 11 Sound The internal impedance is a high Filter 11 VO4.5M — 5.2V (Approximately) 1kΩ, so connect a 8k Buffer to output.

GND

, Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function Reference current source for VCC adjusting the internal filter. Use 64k connected to GND via a 24kΩ resistor. Use an accurate resistor with good temperature characteristics 12 IR — 2.4V 12 500 (e.g. ± 1% metal film). 18.7k 0.85p

GND

Audio signal output. The standard VCC output in the case of B / G is 200 520mVrms (when f = 50kHz). Connect to GND via a 10kΩ resistor. 13 AFOUT OUT 3.2V 27k

GND

For connection to a 5MHz oscillator VCC (when M format is used). 200 Use as a reference oscillator for automatic adjustment of the internal filter, and as the signal for the SIF 14 X5 — 5.0V signal low frequency conversion. 14 (B / G, D / K format: 6MHz, I format: 6.5MHz).

GND VCC

Input terminal for Trap filter SW. 40k 0V: M format (4.5MHz) 5k 2.4V: D / K format (6.5MHz) 15 MODE IN 3.4V 15 50k 4.3V: I format (6.0MHz) 5k Vreg: B / G format (5.5MHz) 40k

GND

, Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC For connection of IF detector VCO oscillator coil. 1k 1k 200 16 PLLCOILA — 3.6V 16 17 PLLCOILB

GND

IF circuit power supply. Pin 18 has a built-in shunt 18 regulator. 18 Vreg — 6.6V VIF

SIF

GND2 For connection of AFT coil. VCC2 To apply AFT defeat, connect to 17k GND via a 1kΩ (approx.) resistor. 17k 11k 1.5k 19 AFTCOIL — 3.0V 1.5k19 3.9k 3.9k GND2V2Terminal for time constant circuit CC for the PLL filter. 3.3V 20 PLLFLT — 3.4V 40k 30k 148k GND2, Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC VIDEO output. 250 Output is via the Sound Trap, 250 B / W noise inverter, and EQ amplifier. Connect to GND via a 4.7kΩ resistor. 21 VEQO OUT 2.0V 21 (SYNC) 27k

GND VCC

EG Filter. 250 250 Connect to GND via an LCR series resonant circuit. R should be ^ 1kΩ. 22 EQFLT — 5.2V 1k 1k 1k

GND

, •Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 9V, and P = 38.9MHz) Parameter Symbol Min. Typ. Max. Unit Conditions 〈Vreg〉 Supply current ICC — 96 110 mA Regulated voltage Vreg 6.2 6.6 7.0 V 〈VIF〉 Input sensitivity VVMin. 34 40 46 dBµ VVO = – 3dB point Maximum allowable input level VVMax. 100 110 — dBµ VVO = + 1dB point AGC range GR 62 70 — dB VVO = ± 3dB range Quiescent video output voltage VP21 3.9 4.3 4.7 V No signal, VP4 = Vreg Video detector output level VVO 1.7 2.0 2.4 VP-P Vi = 80dBµ, AM87.5%MOD Synchronous signal tip voltage VP21SY 1.7 2.0 2.3 V 100% white video signal Video output DG DG — 2 8 % Vi = 80dBµ, AM87.5%MOD Video output DP DP — 3 8 deg 3STEP video signal M, B / G 33 45 — Sound trap attenuation GVOS dB 20∗LOG (VOS / VO0.2M) D / K, I 28 45 — CS beat level I920 37 50 — dB P = 0, P / C = 4, P / S = 14dB Video output S / N S / NV 47 53 — dB Vi = 90dBµ, 100% white White noise threshold voltage VWTH 4.7 5.0 5.3 V CW = 70dBµ White noise clamping voltage VWCL 2.9 3.0 3.5 V frequency variation and pin Black noise threshold voltage VBTH 1.1 1.4 1.7 V 21 voltage variation Black noise clamping voltage VBCL 2.6 2.9 3.2 V RFAGC maximum sink current IP2SI 0.7 1.2 — mA CW = 100dBµ, AGCADJ = 100KΩ 〈AFT〉 Maximum AFT voltage VPIMax. 6.0 6.4 — V CW = 38.4MHz Minimum AFT voltage VPIMin. — 0.3 0.8 V CW = 39.4MHz AFT detection sensitivity Sf 35 65 — mV / kHz CW frequency variation AFT defeat starting voltage VAFTDET — — 1.2 V CW = 38.4MHz AFT defeat voltage VIDEF 2.9 3.3 3.6 V CW = 38.4MHz 〈PLL〉 PLL capture range 1 fCU 0.5 + 0.9 — MHz PLL capture range 2 fCL — – 0.9 – 0.5 MHz PLL lock range 1 fLU 0.6 + 2.0 — MHz CW = 80dBµ PLL lock range 2 fLL — – 2.0 – 0.6 MHz frequency variation VCO control sensitivity β 0.5 1.3 — kHz / mV, Parameter Symbol Min. Typ. Max. Unit Conditions 〈SIF〉 P = 38.9MHz / 80dBµ S = 33.4MHz / 70dBµ – 12dB (SAW Filter Loss) Input sensitivity VSMin. — 24 33 dBµ fm = 400Hz, ∆f = 50kHz SIF maximum allowable input level VSMax. 80 90 — dBµ 5% distortion FM detector output level VSO 350 520 700 mVrms fm = 400Hz, ∆f = 50kHz Audio output S / N SNAF 52 64 — dB fm = 400Hz, ∆f = 50kHz Audio output distortion THD — 0.3 1.5 % fm = 400Hz, ∆f = 50kHz AMR AMR 40 56 — dB ∆f = 25kHz, AM30% MUTE video output voltage VVMUTE — 0.7 1.2 V VPIO = GND MUTE audio output voltage VSMUTE 2.3 2.9 3.5 V VPIO = GND MUTE start voltage VIOMUTE — — 0.3 V Intermode switch voltage V9INT 0.1 — 1.0 V Intermode P = 80dBµ, P / S = 20dB VO4.5M output level VVO4.5M 10 20 40 mVP-P (use FET probe) 〈MODE〉 MODE voltage (M) V15M — 0 0.5 V REF – OSC = 5MHz MODE voltage (B / G) V15BG 6.0 Vreg — V REF – OSC = 6MHz MODE voltage (D / K) V15DK 2.20 2.40 2.60 V REF – OSC = 6MHz MODE voltage (I) V15I 4.10 4.30 4.50 V REF – OSC = 6.5MHz, •Measurement circuit 220k 220k 39µH AFTOUT EQFLT 47p 2k 4.7k 5.1k RFAGC VEQ0 100k 0.68µ 150 AGCADJ PLLFLT 1k AGCFLT AFT COIL 0.033µ GND1 Vreg VIFB PLL COILA VIFA PLL COILB GND2 MODE 18p SIF X5 18p 22p AFC AFOUT 1k VO4.5M IR 24.0k ( + – 1% ) 0.01µ

Fig. 1

Vcc (9V) M (7.5k) 1.3V 5.1k 100 AFOUT Vcc (9V) 2 1 PLL COIL

SWG

6.5M 6M 5M AFT COIL 105µA 95µA2121312SWH310.1µ SWF SWE µ SWD47 22 21 20 19 18 17 16 15 14 13 1212345678910 11 Vcc Vreg 0.01µ SWB SWC VO4.5M 0.01µ 1 : 12120.01µ 10µ 2.2µ 0.01µ SWA 1 0.01µ2 0.01µ SAWFVG AFT OUT SAW FILTER LOSS 12dB RF AGC 0.01µ V9, •Application example Vreg 9V M SW I SW D / K SW VCC (9V) ALL OFF B / G M (7.5k) 100 5.1k

RFOUT

VEQ0 AFT VCC (9V) PLLFLT PLL 6.5M 5M EQFLT MODE

IR

6M + 0.01µ Vreg X5 22 21 20 19 18 17 16 15 14 13 12

EQ AMP

PLL – 45 REF SHIFT VCO Vreg MODE

AF

DET OSC AMP B / W

INV FM

AFT BIAS + 45 DEMOD

SHIFT

VIDEO SIF AMP TRAP SIF SIF LIM VIF SW BPF

AMP LIM VIF AMP

RF IF 500k AGC AGC V BPFCC VIF SIF AMP AMP12345678910 11

AFC

SIF SW GND2 Vreg + GND1 + Vreg VIF IN SAW SIF IN AGCADJ AGCFLT + FILTER RF AGC Vreg AFT OUT VO4.5M IF IN SIF SW MODE SW SPLIT = FREE / INTER = GND Unit R: Ω SIF IN [9pin] DC C: F

STANDARDMB/ G D / K I

V / S C SPACING [MHz] 4.5 5.5 6.5 6.0

MODE [V] 0 6.6 2.4 4.3 OSC [MHz] 5.0 6.0 6.0 6.5 Fig. 2 AT Vreg = 6.6V

22k 220k 0.1µ 220k 47p39µH 2k 22µ / 12V 4.7k 4.7k 4.7k 100k 0.68µ 150 AFT DEF SW 1k 0.1µ 39p 47µ 0.1µ 1.2k 4.7k 2.7k 10p 4700 10p 2k 22p 4.7µ 0.1µ 10k 10µ 1k 24k (+ – 1%) 1k 0.1µ, •Coil specifications f = 38.0MHz f = 38.9MHz 0236 – JPS – 134 0236 – JPS – 121 Type name: S-7GC Type name: S-7GC 4 – 6 4 – 6 8T 8T34S34S

VCO

COIL 2 0.10φ 2 0.12φ1616Tuning capacitance: Tuning capacitance: 22pF RH 22pF RH SUMIDA SUMIDA 0236 – JPS – 137 0236 – JPS – 136 Type name: S-7GC Type name: S-7GC 1 – 2 2 – 3 1 – 2 2 – 3 3T 3T 3T 3T3434

AFT

COIL 2 0.14φ 2 0.10φ1616Tuning capacitance: Tuning capacitance:

S 56pF RH S 56pF RH

SUMIDA 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., •Operation notes (1) Simultaneous audio and video output muting function 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 1kΩ 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 95dBµ. (5) Intercarrier mode switching Intercarrier mode can be set by pulling the SIF terminal down via a 2kΩ resistor. (6) IR terminal external resistor This resistor sets the filter system reference current, so use an accurate component that has good temperature char- acteristics. •Electrical characteristic curves 1.5 1.5 IC is not connected. 1.4375 When mounted on a glass eoxy board. 1.25 1.0 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 POWER DISSIPATION: Pd (W) POWER DISSIPATION: Pd (W), •External dimensions (Units: mm) 19.4 ± 0.3 22 12 7.62 1 11 0.3 ± 0.1 1.778 0.5 ± 0.1 0° ~ 15° SDIP22 3.4 ± 0.2 3.95 ± 0.3 0.51Min. 6.5 ± 0.3]

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