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BA7207AS Datasheet(PDF) 3 Page - Rohm |
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BA7207AS Datasheet(HTML) 3 Page - Rohm |
3 / 17 page 3 Video ICs BA7207AS / BA7207AK •Pin descriptions Pin name 1 (40) RECIN 2 (42) MUL 3 (43) FADJ1 4 (44) FADJ2 5 (1) GND1 6 (2) AMPOUT 7 (3) GND 8 (5) SCMPIN 9 (7) DET 10 (9) VCO 11 (10) PBOUT 12 (11) SGADJ 13 (12) SGC Pin No. Function Recording system input. Input the REC system chroma signal. PB sync gate output. Test pin. Outputs the chroma signal after it is multiplied by four and passed through the sync gate. Normally connected to VCC to prevent interference. Filter fo adjustment pin 1. Used to adjust fo for the equalizer, 1.1MHz BPF and 2.2MHz BPF. Connect a resistor and variable resistor from this pin to GND. Filter fo adjustment pin 2. Used to adjust fo for the bell filter, 4.3MHz BPF-A and 4.3MHz BPF-B. Connect a resistor and variable resistor from this pin to GND. Ground. PB system preamplifier output. Connect to GND via a variable resistor to adjust the level, and input to pin 8. Ground. PB system output amplifier input. Input the level-adjusted PB system SECAM chroma signal. Phase comparator output. Connect to GND via a RC LPF to obtain the error voltage. VCO oscillator frequency control pin. The error voltage is input via a resistor. Connected to GND via free-running frequency setting resistor. PB system output. Outputs the PB system chroma signal. Fine adjustment for the sync gate phase. The voltage from a resistor divider is used for fine adjustment of the gate phase of the sync gate. Normally open. Sync gate timing output. Test pin. Outputs the REC sync gate timing. Normally open. 14 (13) PALPIN 15 (14) DIV 16 SYNCIN PAL PB system input. Input chroma signal for the PAL PB system. Divide-by-four divider output. Test pin. Outputs the chroma signal after it has been divided by four. Normally connected to VCC to prevent interference. Delayed sync signal input. Input the synchronously-separated composite 17 (18) BWL 18 (20) PBIN 19 (21) RECH 20 (22) CREF3 21 (23) CTL 22 (24) LAO 23 (25) 24 (27) LAIN 25 (29) CREF1 26 (31) ABELO 27 (32) CREF2 BA7207AK pin numbers are given in brackets. Pin name Pin No. Function VCC Chroma killer mode setting . "L" sets the IC in chroma killer mode. PB system input . Input chroma signal for the PB system. REC / PB mode switch. Set to open or "H" for REC mode, "L" for PB mode. Bias terminal for the limiter amplifier before × 2. Connect to GND via a capacitor. SECAM / PAL output switch. Selects the signal output for the REC / PB terminal. Set to open or "H" for SECAM output mode, "L" for PAL mode. Limiter amplifier output. Test pin. Outputs the amplitude-limited chroma signal. Normally connected to VCC to prevent interference. Power supply. Limiter amplifier input. Input the de-emphasised chroma signal. Limiter amplifier bias pin 1. Connect to GND via a capacitor. REC BELL output. When in REC mode, de-emphasised chroma signal is output via REC BELL. When in PB mode, the PB system chroma signal is output after being multiplied by four. Limiter amplifier bias pin 2. Connect to GND via a capacitor. 28 (33) RECOUT 29 (34) TRAP 30 (35) PALRIN REC system output. REC system chroma signal output. TRAP connection. Connect TRAP that rejects spurious signal component after × 2 multiplication. PAL REC system input. PAL REC system chroma signal input. 31 (36) VREG 32 (38) × 40 Regulated voltage output. Output for the regulated 2.5V reference voltage used for internal biasing. Connect to GND via a bypass capacitor. × 4 multiply output. Test pin. Outputs the chroma signal after it is multiplied by four. Normally connected to VCC to prevent interference. |
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