HA12179F
HA12179F is Audio Signal Processer manufactured by Hitachi Semiconductor.
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
- PB equalizer
- Dolby B-NR
- Music sensor × 2 channel × 2 channel × 2 channel × 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 patible 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.
Ordering Information
Package HA12179F QFP 56 PB-OUT level 387.5 m Vrms REC OUT level 300 m Vrms Dolby level 300 m Vrms
PB-OUT level above shown is typical value when adjusting Dolby level at Rec-out with NR-off mode.
Rev.1, Apr. 1994, page 2 of 40
LINE OUT (L) RECOUT (L) PB OUT (L) + 41 MUTE 27 MS GND 26 25
×1
EQOUT (L) 40 RIP 39 38 37 36 35 34 33 32
Block Diagram
FFI 31 30 29 NOI MS VREF 28
120/70
44 DOLBY B-NR
- +
46 24 FF NO
F/R 47 VRER (L)
+ VCC
49 GND
+
- DET MSV 23 CC VCC 22 21 D GND 20 MSOUT
50 GND MS...
