HA12134A Datasheet, PDF (6/27 Pages) Hitachi Semiconductor – Dolby B-Type Noise Reduction System

HA12134A, HA12135A, HA12136A
Pin Description (Ta = 25°C, V_CC = 12 V, No signal, The value in the table show typical
value.)
Pin No. Symbol
1, 16 REC IN
R (in) VDC
56 kΩ 6.0 V
Equivalent circuit
Description
V_CC Recording (encode) input
56k
2
3, 14
V
CC
PB IN
—
12.0 V
100 kΩ 6.0 V
V_CC /2
GND
V_CC
Power supply
Playback (decode) input
100k
4
V_REF
—
6.0 V
5
NR ON/OFF —
—
1k
6, 11 PB OUT
—
6.0 V
100
100
V_CC /2
GND
V_CC
3 V_BE
Reference voltage
Mode control pin for NR
ON/OFF
“H”→NR ON
“L”→NR OFF
4 V_BE
100k
GND
V_CC
Playback (decode) output
GND
Rev.3, Jun. 1999, page 6 of 27