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harman/kardon

DMC250/230 Service Manual

Page 41 of 110

harman/kardon

DMC250/230 Service Manual

Page 42 of 110

•

Pin descriptions and input / output circuits

Pin. No

Pin name

IN

OUT

Reference

voltage

Equivalent circuit

Function

1

MUTE

K

—

—

K

—

—

2
4
7

INA
INB
INC

—

K

0.9V

0.95V

14
12

9

15
13
10

OUTA2
OUTB2
OUTC2

OUTA1
OUTB1
OUTC1

—

—

5.0V

16

V

CC

Muting control

If MUTE (pin 1) is set to HIGH, muting 
is carried out simultaneously on all 
three channels.

Signal input

Input signals consist of composite 
video signals, Y signals, C signals, 
RGB, and others. The input level is 
within a range of 0 to 1.3 (min.) to 1.5 
(typ.).

—

—

0V

3
5
8

GND

Ground

Signal output

The signal output level is (0.9 + 2 

×

 

input voltage [V]). Pins 9, 12, and 14 
are the pins for sag correction. If pins 
10, 13, and 15 are set to 0.2V or less, 
the protective circuit is triggered and 
the power-saving mode is accessed.

Power supply

15k

8k

GND

15pin
13pin
10pin

14pin
12pin
  9pin

Vcc

harman/kardon

DMC250/230 Service Manual

Page 43 of 110

BH7862FS

Multimedia ICs

3/9

!

!

!

!

Pin No.

Pin name

Pin description

Input/output equivalent circuit

3

12
14

CIN

PbIN

PrIN

5
8

YIN

PYIN

Signal input terminal.

Input terminal for chroma signal and color-difference 
signal.
Bias type input.
The input impedance is 20k

Ω

.

Signal input terminal.

Input terminal for luminance signal.
Di clamp input.

24
25

29
30

MIXFB

MIXOUT

YFB

YOUT

Signal output terminal.

Output terminal for luminance signal (interlaced type).

Signal output terminal.

Output terminal for Y/C MIX signal.

Signal output terminal.

Output terminal for chroma signal.

32

COUT

20k

harman/kardon

DMC250/230 Service Manual

Page 44 of 110