BA7357S

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 = 25°C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Pin 2 applied voltage Symbol VCCMax. PdMax. Topr Limits 10.5∗1 1250∗2 – 15 ~ + 70 – 40 ~ + 150 10.5 Unit V mW °C °C V Tstg VP2Max. ∗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 Power supply voltage (9V) Power supply voltage (12V) Guaranteed operating power supply voltage Symbol VCC9V VCC12V VCC Limits 8.8 ~ 9.2∗1 11.7 ~ 12.3∗2 8.5 ~ 9.5∗1 Unit V V V ∗1 24Ω resistor connected between VCC and Vreg. ∗2 56Ω 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 100kΩ resistor connected) 3 1k RFAGC delay point adjustment. Connect to GND via a variable resistor (approx. 100kΩ). 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 2kΩ 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 4.7µF 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 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) 1kΩ, 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 24kΩ 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 10kΩ 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 1kΩ (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 4.7kΩ 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 1kΩ. 22 EQFLT — 5.2V 22 1k 1k 1k GND 8 Video ICs BA7357S CC •Electrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter 〈Vreg〉 Supply current Regulated voltage = 9V, and P = 38.9MHz) Max. Unit Conditions Symbol Min. Typ. ICC Vreg — 96 6.6 110 7.0 mA V dBµ dBµ dB V VP-P V % deg dB dB dB V V V V mA CW = 100dBµ, AGCADJ = 100KΩ 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 — — VVO = – 3dB point VVO = + 1dB point VVO = ± 3dB range No signal, VP4 = Vreg Vi = 80dBµ, AM87.5%MOD 100% white video signal Vi = 80dBµ, AM87.5%MOD 3STEP video signal 20 LOG (VOS / VO0.2M) P = 0, P / C = 4, P / S = 14dB Vi = 90dBµ, 100% white CW = 70dBµ 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 — 〈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 β 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 = 80dBµ frequency variation 9 Video ICs BA7357S Parameter Symbol Min. Typ. Max. Unit dBµ dBµ mVrms dB % dB V V V V mVP-P Conditions fm = 400Hz, ∆f = 50kHz 5% distortion 〈SIF〉 P = 38.9MHz / 80dBµ S = 33.4MHz / 70dBµ – 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 fm = 400Hz, ∆f = 50kHz fm = 400Hz, ∆f = 50kHz fm = 400Hz, ∆f = 50kHz ∆f = 25kHz, AM30% VPIO = GND VPIO = GND Intermode P = 80dBµ, 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 0.033µ SWG 27 6.5M 1 2 0.1µ 18 PLL COILA Vreg 17 16 PLL COILB 3 SWF 15 MODE 47µ 20 AFT COIL PLLFLT 19 22p 2 1 Vcc (9V) 39µH 6M 5M 105µA 2 1 SWE 14 X5 13 AFOUT 12 IR 3 2 4.7k 2 0.68µ SWH 1 150 AFT COIL 95µA 1 SWD 22 EQFLT VEQ0 21 24.0k ( + – 1% ) 0.01µ AGCADJ AFTOUT AGCFLT 1 Vcc 2 3 4 5 6 0.01µ 100k 5.1k 0.01µ 2.2µ SWA 2 1 0.01µ 0.01µ 7 8 9 10 11 VO4.5M RFAGC GND1 GND2 VIFB VIFA AFC SIF Vreg 220k SWB 1:1 2 1 2 0.01µ SWC 1 10µ VO4.5M •Measurement circuit 0.01µ 220k Video ICs AFT OUT RF AGC VG SAWF SAW FILTER LOSS 12dB 0.01µ 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 0.1µ 47µ 6M 0.01µ X5 17 16 15 14 13 12 10p PLL 5M 0.1µ IR 0.1µ 24k (+ – 1%) Vreg 470 VO4.5M 1k Unit R: Ω C: F 1.2k I SW 9V 4.7k VEQ0 4.7k M SW •Application example EQFLT 0.68µ 150 47p39µH 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 0.1µ 4 5 4700 6 7 8 GND2 4700 9 SIF SW 10 AFC 4.7µ 10k 11 22µ / 12V 220k 4700 Vreg + GND1 + 220k VIF IN AGCADJ RF AGC AGCFLT 0.1µ 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 10µ 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 4 S 4–6 8T 0.12φ 2 1 0.10φ 6 2 1 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 0.10φ 6 0.14φ 6 2 1 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 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 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