BA7207AK View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BA7207AK

SECAM chroma signal processor for VHS VCRs

ROHM Semiconductor 

Video ICs

BA7207AS / BA7207AK

•Pin descriptions

Pin No. Pin name

Function

Recording system input.

1 (40) RECIN Input the REC system chroma signal.

2 (42)

MUL

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.

3 (43)

FADJ1

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.

4 (44)

FADJ2

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.

5 (1) GND1 Ground.

PB system preamplifier output.

6 (2) AMPOUT Connect to GND via a variable resistor to adjust

the level, and input to pin 8.

7 (3) GND Ground.

PB system output amplifier input.

8 (5) SCMPIN Input the level-adjusted PB system SECAM

chroma signal.

9 (7)

DET

Phase comparator output.

Connect to GND via a RC LPF to obtain the error

voltage.

10 (9)

VCO

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.

11 (10) PBOUT Outputs the PB system chroma signal.

12 (11)

SGADJ

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.

13 (12)

SGC

Sync gate timing output.

Test pin. Outputs the REC sync gate timing.

Normally open.

PAL PB system input.

14 (13) PALPIN Input chroma signal for the PAL PB system.

15 (14)

DIV

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.

16 SYNCIN Input the synchronously-separated composite

Pin No. Pin name

Function

17 (18)

BWL

Chroma killer mode setting . "L" sets the IC in

chroma killer mode.

18 (20)

PBIN

PB system input .

Input chroma signal for the PB system.

REC / PB mode switch.

19 (21) RECH Set to open or "H" for REC mode, "L" for PB

mode.

20 (22)

CREF3

Bias terminal for the limiter amplifier before × 2.

Connect to GND via a capacitor.

21 (23) CTL

22 (24) LAO

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.

23 (25)

24 (27)

VCC

LAIN

Power supply.

Limiter amplifier input.

Input the de-emphasised chroma signal.

Limiter amplifier bias pin 1.

25 (29) CREF1 Connect to GND via a capacitor.

26 (31)

ABELO

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.

27 (32)

CREF2

Limiter amplifier bias pin 2.

Connect to GND via a capacitor.

28

(33)

RECOUT

REC

REC

system

system

output.

chroma

signal

output.

29 (34)

TRAP

TRAP connection.

Connect TRAP that rejects spurious signal

component after × 2 multiplication.

30 (35)

PALRIN

PAL REC system input.

PAL REC system chroma signal input.

31 (36) VREG

Regulated voltage output.

Output for the regulated 2.5V reference voltage

used for internal biasing. Connect to GND via a

bypass capacitor.

32 (38) × 40

× 4 multiply output.

Test pin. Outputs the chroma signal after it is

multiplied by four. Normally connected to VCC to

prevent interference.

BA7207AK pin numbers are given in brackets.

3

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