BA7207AS datasheet(3/17 Pages) ROHM

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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

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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