HA12179F
Audio Signal Processer for Car Deck and Cassette Deck
(Dolby B-type NR with PB Amp)
ADE-207-136
1st Edition
Apr. 1994
Description
HA12179F is silicon monolithic bipolar IC providing Dolby noise reduction system*, line mute, music
sensor and PB equalizer system in one chip.
Functions
Line mute
2 channel
PB equalizer
2 channel
Dolby B-NR
2 channel
Music sensor
1 channel
Features
Different type of PB equalizer characteristics selection (normal/chrome or metal) is available with fully
electronic control switching built-in.
Line mute ON/OFF is available.
Changeable to Foward, Reverse-mode for PB head with fully electronic control switching built-in.
Available to change music sensing level by external resistor.
Music sensing level selection is available with fully electronic control switching built-in.
Available to change frequency response of music sensor.
NR-ON/OFF and REC/PB fully electronic control switching built-in.
Pin compatible of HA12163 series except for 4 and 39 Pins.
*
Dolby is a trademark of Dolby Laboratories Licensing Corporation.
A license from Dolby Laboratories Licensing Corporation is required for the use of this IC.
HA12179F
Rev.1, Apr. 1994, page 2 of 40
Ordering Information
Package
PB-OUT level
REC OUT level
Dolby level
HA12179F
QFP 56
387.5 mVrms
300 mVrms
300 mVrms
PB-OUT level above shown is typical value when adjusting Dolby level at Rec-out with NR-off mode.
HA12179F
Rev.1, Apr. 1994, page 4 of 40
Pin Discription (V
CC
= 9 V Single supply, Ta = 25C, No signal, The value in the table
show typical value.)
Pin No.
Terminal
name
Zin
DC
voltage Equivalent circuit
Description
2
TAI
100 k
V
CC
/2
Tape input
41
V
CC
/2
5
MUI
Mute circuit input
38
25
MSI
Music sensor
rectifier input
10
NR DET
--
2.5 V
Time constant
pin for rectifier
33
3
BIAS
--
0.28 V
GND
Reference
current input
24
MS DET
--
V
CC
GND
Time constant
pin for rectifier
40
RIP
--
V
CC
/2
Ripple filter
HA12179F
Rev.1, Apr. 1994, page 5 of 40
Pin Discription (V
CC
= 9 V Single supply, Ta = 25C, No signal, The value in the table
show typical value.) (cont)
Pin No.
Terminal
name
Zin
DC
voltage Equivalent circuit
Description
43
EQ OUT
--
V
CC
/2
Equalizer output
56
V
CC
GND
6
PB OUT
Play back
37
(Decode) output
30
MS V
REF
Reference
voltage buffer
output
26
MA OUT
Music sensor
amp. output
47
V
REF
Reference
52
voltage buffer
output
12
REC OUT
Recording
31
(Encode) output
4
LINE OUT
Mute circuit
39
output
44
EQ OUT-M
--
V
CC
/2
V
CC
GND
Equalizer output
(Metal)
55
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