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BA7207AK

Rohm
Part Number BA7207AK
Manufacturer Rohm
Description SECAM chroma signal processor for VHS VCRs
Published Apr 1, 2005
Detailed Description Video ICs SECAM chroma signal processor for VHS VCRs BA7207AS / BA7207AK The BA7207AS and BA7207AK are LSI components t...
Datasheet PDF File BA7207AK PDF File

BA7207AK
BA7207AK

Overview
Video ICs SECAM chroma signal processor for VHS VCRs BA7207AS / BA7207AK The BA7207AS and BA7207AK are LSI components that incorporate the contain circuitry required for SECAM chroma signal processing.
The ICs have both recording and playback systems and each includes a bell filter, a bandpass filter, a limiter amplifier, a multiply-by-four circuit, a divide-by-four circuit, and a sync-gate circuit.
Applications • SECAM and VHS format video cassette recorders and camcorders Features • 1) All filters required for SECAM chroma signal processing are provided.
2) Built-in chroma killer circuit.
3) Built-in switch circuit for selecting PAL chroma or SECAM chroma for the PB / REC system output.
•Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature BA7207AS BA7207AK BA7207AS BA7207AK Symbol VCC Pd Limits 7 1400 (SDIP32)∗1 850 (QFP44)∗2 – 25 ~ + 75 – 25 ~ + 65 – 55 ~ + 125 Unit V mW °C °C Topr Tstg ∗1 Reduced by 14mW for each increase in Ta of 1°C over 25°C .
∗2 When mounted on a 70mm × 70mm, t = 1.
6mm glass epoxy board, reduced by 8.
5W for each increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C) Parameter Operating power supply voltage Symbol VCC Min.
4.
5 Typ.
5.
0 Max.
5.
5 Unit V 1 Video ICs BA7207AS / BA7207AK •Block diagram PALRIN RECOUT BA7207AS (SDIP32) VREG TRAP ABELO CREF1 CREF2 CREF3 RECH × 4O PBIN LAIN 32 31 30 29 28 27 26 25 24 23 22 21 MODE CONTOROL 20 19 18 17 VREG PAL SCM LIM ×2 2.
2MHz BPF ×2 LIM P R EQ P 1.
1MHz BPF R P R 4.
3MHz BPF—A R P BELL 4.
3MHz BPF - B PB SYNC GATE P R ÷4 REC SYNC GATE R P DET VCO SCM PAL FREQUENCY ADJUSTER SYNC GATE TIMING GENERATOR 1 RECIN 2 MUL 3 FADJ1 4 FADJ2 5 GND1 6 AMPOUT 7 GND 8 SCMPIN 9 DET 10 VCO 11 PBOUT 12 SGADJ 13 SGC 14 PALPIN 15 DIV 16 SYNCIN RECOUT BA7207AK (SQFP44) ABELO CREF2 CREF1 LAIN VCC LAO N.
C.
N.
C.
N.
C.
33 32 31 30 29 28 ...


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