HA12134A Datasheet, PDF (7/27 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.) (cont)
Pin No. Symbol
7, 10 DET
R (in) VDC
—
1.3 V
Equivalent circuit
V_CC
Description
Time constant pin for the
level detector
8, 9 REC OUT —
6.0 V
12
REC/PB
—
—
13
BIAS
—
1.0 V
GND
V_CC
100
100
Recording (encode)
output
GND
V_CC
Mode control pin for
REC/PB (encode/decode)
“H” → REC (encode)
“L” → PB (decode)
1k
3 V_BE
4 V_BE
100k
GND
V_CC
Reference current input
pin for the active filters
15
GND
—
0V
—
GND
Ground
Rev.3, Jun. 1999, page 7 of 27