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PDF HA12179F Data sheet ( Hoja de datos )
| Número de pieza | HA12179F | |
| Descripción | Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp) | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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
• 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 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.
1 page  
HA12179F
Pin Discription (VCC = 9 V Single supply, Ta = 25°C, No signal, The value in the table
show typical value.) (cont)
Pin No.
43
56
Terminal
name
EQ OUT
DC
Zin voltage Equivalent circuit
— V /2
CC
VCC
Description
Equalizer output
6 PB OUT
37
30 MS VREF
26 MA OUT
47 V
REF
52
12 REC OUT
31
4 LINE OUT
39
44
EQ OUT-M —
VCC/2
55
GND
VCC
Play back
(Decode) output
Reference
voltage buffer
output
Music sensor
amp. output
Reference
voltage buffer
output
Recording
(Encode) output
Mute circuit
output
Equalizer output
(Metal)
GND
Rev.1, Apr. 1994, page 5 of 40
5 Page 
HA12179F
Operating Mode Control
HA12179F provides electronic switching circuits. And each operating mode control are controlled by
parallel data (DC voltage).
Table 2 Threshold Voltage (VTH)
Pin No.
Lo
Hi
14 15 16 17 18 –0.2 to 1.0
19
3.5 to 5.3
Unit
V
Test condition
Input Pin
Measure
V
Table 3 Switching Truth Table
Pin No.
Lo
Hi
14 NR-OFF
NR-ON
15 PB
REC
16 MUTE-OFF
MUTE-ON
17
120 µ (NORMAL)
70 µ (METAL or CHROME)
18 FORWARD
REVERSE
19
SER (FF or REV)
REP (NORMAL SPEED)
Notes: 1. Each pins are on pulled down with 100 kΩ internal resistor.
Therefore, it will be low-level when each pins are open.
2. Over shoot level and under shoot level of input signal must be the standardized (High: 5.3 V,
Low: –0.2 V)
3. Reducing pop noise is so much better for 10 kΩ to 22 kΩ resistor and 1 µF to 22 µF capacitor
shown Fig 2. But the resistor connected to MUTE terminal (pin 16) should be under 10 kΩ.
INPUT Pin
10 to 22kΩ
+
1 to 22µF
MPU
Figure 2 Interface for Reduction of Pop Noise
Rev.1, Apr. 1994, page 11 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA12179F.PDF ] | |
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