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. •TVsApplications and VCRs •1)Features Separate-carrier PLL with full synchronous detec2) 3) 4) 5) 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. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Applied voltage VCCMax. 10.5∗1 Power dissipation PdMax. 1250∗2 Operating temperature Topr – 15 ~ + 70 °C Storage temperature Tstg – 40 ~ + 150 °C Pin 2 applied voltage VP2Max. 10.5 V Limits Unit V mW ∗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 Power supply voltage (9V) Power supply voltage (12V) VCC9V 8.8 ~ 9.2∗1 V VCC12V 11.7 ~ 12.3∗2 V VCC 8.5 ~ 9.5∗1 V Guaranteed operating power supply voltage ∗1 24Ω resistor connected between VCC and Vreg. ∗2 56Ω resistor connected between VCC and Vreg. 1 Video ICs BA7357S 2 AGCADJ 3 RF AGC AGCFLT 4 GND1 5 VIFB 6 VIFA 7 GND2 8 SIF 9 AFC 10 VO4.5M 11 EQFLT 21 VEQO 20 PLLFLT 19 AFTCOIL 18 Vreg 17 PLLCOILA 16 PLLCOILB MODE RFAGC 22 15 MODE REF OSC 1 14 X5 13 AFOUT 12 IR AFT VIDEO AMP – 45 SHIFT + 45 SHIFT PLL DET SIF TRAP 2 BIAS AF AMP FM DEMOD LIM LIM 500k BPF SIF BPF SIF AMP SIF SW Vreg VCO VIF AMP VIF AMP VIF AMP EQ AMP B/W INV AFTOUT IF AGC •Block diagram Video ICs BA7357S •Pin descriptions Pin No. Pin name 1 AFTOUT Function 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 9 SIF SIF IN / intercarrier SW 10 AFC AUDIO detector Filter and A / V mute SW 11 VO4.5M 12 IR 13 AFOUT 14 X5 SIF, PLL GND 2nd SIF OUT FIilter BIAS resistor ( ± 1%) AUDIO OUT Filter system reference frequency oscillator MODE SW 15 MODE 16 PLL COIL B PLL oscillator COIL 17 PLL COIL A PLL oscillator COIL 18 Vreg 19 AFT COIL 20 PLL FLT 21 VEQO VIDEO OUT after EQ amplifier 22 EQFLT EQ Filter Vreg AFT COIL PLL phase detect filter 3 Video ICs BA7357S •Equivalent circuits Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC AFT output. Vreg / GND push-pull output. 500 1k 1 AFTOUT OUT 1 — 500 GND VCC 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. 4k 2 RFAGC OUT — 2 GND VCC 3 AGCADJ — RFAGC delay point adjustment. Connect to GND via a variable resistor (approx. 100kΩ). 2.7V (when 100kΩ resistor connected) 4.5k 4k 3 1k 25.2k GND VCC For filter time constant for VIFAGC. 400 4 AGCFLT — 5.0V 4 GND 5 GND1 — 0V — ∗ VCC and VCC2 in the equivalent circuit diagrams are connected to the Vreg terminal (pin 18). 4 GND terminal for VIF, AGC and AFT. Video ICs BA7357S Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC 1k 1k 6 VIFB 7 VIFA Video IF input. Use with balanced input. 5 IN 4.2V 7 5.3k 5.3k 1k GND 8 GND2 — 0V SIF and PLL GND. — VCC Audio IF input. Can set to intercarrier mode by pulling down via a 2kΩ resistor. 15k 20k 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 4.7µF capacitor and to Vreg via a 10µF capacitor to reduce BUZZ. Set this pin to 0.3V or lower to apply Audio / Video Mute. GND VCC 11 11 VO4.5M — Sound Filter 5.2V 8k 2nd SIF output. Connect a Trap to this pin to vary the Sound Filter characteristics. The internal impedance is a high (Approximately) 1kΩ, so connect a Buffer to output. GND 5 Video ICs BA7357S Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC 64k 12 IR — 2.4V 12 500 Reference current source for adjusting the internal filter. Use connected to GND via a 24kΩ resistor. Use an accurate resistor with good temperature characteristics (e.g. ± 1% metal film). 0.85p 18.7k GND Audio signal output. The standard output in the case of B / G is 520mVrms (when f = 50kHz). Connect to GND via a 10kΩ resistor. VCC 200 13 AFOUT OUT 3.2V 13 27k GND VCC 200 14 X5 — 5.0V 400 14 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 Input terminal for Trap filter SW. 0V: M format (4.5MHz) 40k 2.4V: D / K format (6.5MHz) 5k 15 MODE IN 3.4V 15 4.3V: I format (6.0MHz) 50k 5k Vreg: B / G format (5.5MHz) 40k GND 6 Video ICs BA7357S Pin No. Pin name IN / OUT Standard voltage Function Equivalent circuit VCC 1k 16 PLLCOILA 17 PLLCOILB — 1k For connection of IF detector VCO oscillator coil. 200 16 3.6V 17 GND IF circuit power supply. Pin 18 has a built-in shunt regulator. 18 18 Vreg — VIF SIF 6.6V GND2 VCC2 17k 17k 19 AFTCOIL — 3.0V 11k For connection of AFT coil. To apply AFT defeat, connect to GND via a 1kΩ (approx.) resistor. 1.5k 1.5k 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 500 148k 40k GND2 7 Video ICs BA7357S Pin No. Pin name IN / OUT Standard voltage Equivalent circuit Function VCC VIDEO output. Output is via the Sound Trap, B / W noise inverter, and EQ amplifier. Connect to GND via a 4.7kΩ resistor. 250 250 21 VEQO OUT 2.0V (SYNC) 21 27k GND VCC 250 22 EQFLT — 5.2V 22 250 1k 1k 1k GND 8 EG Filter. Connect to GND via an LCR series resonant circuit. R should be ⭌ 1kΩ. Video ICs BA7357S •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter Symbol Min. = 9V, and P = 38.9MHz) Typ. Max. Unit Conditions 〈Vreg〉 Supply current ICC — 96 110 mA Vreg 6.2 6.6 7.0 V Input sensitivity VVMin. 34 40 46 dBµ VVO = – 3dB point Maximum allowable input level Regulated voltage 〈VIF〉 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 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 33 45 — 45 — dB 20 LOG (VOS / VO0.2M) 28 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 White noise clamping voltage VWCL 2.9 3.0 3.5 V Black noise threshold voltage VBTH 1.1 1.4 1.7 V Black noise clamping voltage VBCL 2.6 2.9 3.2 V RFAGC maximum sink current IP2SI 0.7 1.2 — mA Maximum AFT voltage VPIMax. 6.0 6.4 — V CW = 38.4MHz Minimum AFT voltage VPIMin. — 0.3 0.8 V CW = 39.4MHz Sf 35 65 — Synchronous signal tip voltage Sound trap attenuation M, B / G D / K, I CS beat level GVOS Vi = 80dBµ, AM87.5%MOD ∗ CW = 70dBµ frequency variation and pin 21 voltage variation CW = 100dBµ, AGCADJ = 100KΩ 〈AFT〉 AFT detection sensitivity AFT defeat starting voltage AFT defeat voltage mV / kHz CW frequency variation VAFTDET — — 1.2 V CW = 38.4MHz VIDEF 2.9 3.3 3.6 V CW = 38.4MHz fCU 0.5 + 0.9 — MHz 〈PLL〉 PLL capture range 1 PLL capture range 2 fCL — – 0.9 – 0.5 MHz PLL lock range 1 fLU 0.6 + 2.0 — MHz PLL lock range 2 fLL — – 2.0 – 0.6 MHz VCO control sensitivity β 0.5 1.3 — CW = 80dBµ frequency variation kHz / mV 9 Video ICs Parameter BA7357S 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 VSO 350 520 700 mVrms fm = 400Hz, ∆f = 50kHz SNAF 52 64 — dB fm = 400Hz, ∆f = 50kHz FM detector output level Audio output S / N 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 V9INT 0.1 — 1.0 V VVO4.5M 10 20 40 mVP-P 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 V15I 4.10 4.30 4.50 V REF – OSC = 6.5MHz Intermode switch voltage VO4.5M output level Intermode P = 80dBµ, P / S = 20dB (use FET probe) 〈MODE〉 MODE voltage (I) 10 BA7357S Video ICs •Measurement circuit Vreg 220k 220k 1 Vcc (9V) 27 1.3V 1 0.1µ PLL COIL 2 6.5M 1 3 2 6M 5M 1 0.01µ 13 100 105µA 2 5.1k M (7.5k) SWD 1 95µA Vcc (9V) 3 12 24.0k ( + – 1% ) VO4.5M 11 10µ 1 10 SWC 1k SAW FILTER LOSS 12dB SAWF 1 2 0.01µ SWB SWE 15 9 SWF 16 8 0.01µ VG 14 17 7 SIF 2 18 6 MODE 0.01µ GND2 SWG 47µ 5 2 PLL COILB 1:1 VIFA AFT COIL 19 4 0.01µ 22p PLL COILA 2 SWH 20 3 SWA 18p V9 AFOUT Fig. 1 18p VIFB X5 21 2 2.2µ 0.01µ Vreg GND1 1k 1 AFT COIL 22 1 Vcc 2 AGCADJ AFT OUT VEQ0 RF AGC IR VO4.5M AFOUT AFC PLLFLT RFAGC 39µH 0.01µ 4.7k EQFLT 5.1k AGCFLT 150 0.68µ 100k 2k 47p AFTOUT 0.033µ 0.01µ 11 Video ICs BA7357S •Application example Vreg M SW 1.2k D / K SW 2.7k 4.7k I SW 4.7k 4.7k 9V VCC (9V) ALL OFF B / G M (7.5k) 5.1k 22 21 0.01µ X5 18 17 – 45 SHIFT PLL DET 16 VCO Vreg 15 14 13 MODE REF OSC AF AMP B/W INV AFT 24k (+ – 1%) IR 0.1µ 1k EQ AMP 5M 6M Vreg 19 10k 6.5M MODE + 20 10p PLL 0.1µ 1k 22p 10p VCC (9V) 24 0.68µ 150 4.7k 47p39µH EQFLT AFT 47µ 2k PLLFLT 0.1µ VEQ0 RFOUT 39p AFT DEF SW 100 FM DEMOD BIAS + 45 12 SHIFT SIF TRAP VIDEO AMP SIF SW VIF AMP SIF BPF LIM LIM 7 8 10 11 AFC SIF SW GND2 VIF IN AGCADJ 9 + SIF IN SAW FILTER AGCFLT + Vreg VO4.5M 1k RF AGC AFT OUT Vreg 4.7µ 4700 GND1 6 470 5 4700 0.1µ 100k 4700 22µ / 12V 4 4700 220k + 3 0.1µ 220k Vreg 2 4700 22k 1 500k BPF SIF AMP VIF AMP 10µ IF AGC 2k RF AGC VCC VIF AMP IF IN SIF SW MODE SW SPLIT = FREE / INTER = GND SIF IN [9pin] DC STANDARD M V / S C SPACING [MHz] 4.5 5.5 6.5 6.0 0 6.6 2.4 4.3 5.0 6.0 6.0 6.5 MODE [V] OSC [MHz] Fig. 2 12 B/G D/K I AT Vreg = 6.6V Unit R: Ω C: F Video ICs BA7357S •Coil specifications f = 38.0MHz 0236 – JPS – 121 Type name: S-7GC 0236 – JPS – 134 Type name: S-7GC 3 VCO COIL 4 S 2 1 f = 38.9MHz 4–6 8T 3 0.10φ 0.12φ 6 Tuning capacitance: 22pF RH Tuning capacitance: 22pF RH SUMIDA SUMIDA 0236 – JPS – 136 Type name: S-7GC 0236 – JPS – 137 Type name: S-7GC 1–2 2–3 3T 3T 1–2 2–3 3T 3T AFT COIL 3 4 1 S 3 0.14φ 2 S 2 1 6 4 4–6 8T Tuning capacitance: 56pF RH 0.10φ 2 1 6 4 S SUMIDA 6 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 notes •(1)Operation 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 characteristics. •Electrical characteristic curves IC is not connected. 1.25 1.0 0.5 0 25 50 75 100 125 TEMPERATURE: Ta (°C) Fig. 3 Power dissipation 14 1.5 1.4375 POWER DISSIPATION: Pd (W) POWER DISSIPATION: Pd (W) 1.5 150 When mounted on a glass eoxy board. 1.0 0.5 0 25 50 75 100 125 TEMPERATURE: Ta (°C) Fig. 4 Power dissipation 150 Video ICs BA7357S •External dimensions (Units: mm) 19.4 ± 0.3 12 6.5 ± 0.3 0.51Min. 3.4 ± 0.2 3.95 ± 0.3 22 11 1 7.62 0.3 ± 0.1 1.778 0.5 ± 0.1 0° ~ 15° SDIP22 15