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PDF HA12174 Data sheet ( Hoja de datos )
| Número de pieza | HA12174 | |
| Descripción | Audio Signal Processor for Car Deck and Cassette Deck (Dolby B/C-type NR with PB Amp) | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HA12173 Series
Audio Signal Processor for Car Deck and Cassette Deck
(Dolby B/C-type NR with PB Amp)
ADE-204-016
1st Edition
Nov. 1992
Description
HA12173 series are silicon monolithic bipolar IC providing Dolby noise reduction system*, music sensor
and PB equalizer system in one chip.
Functions
• PB equalizer
• Dolby B/C-NR
• Music sensor
× 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.
• 2 type of input selection (RADIO/TAPE) is available.
• Changeable to Forward, 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.
• 4 type of PB-out level.
• Available to allow common PCB designs with HA12163 series.
* 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  
HA12173 Series
Pin Description (VCC = 9 V Single supply, Ta = 25°C, No signal, The value in the table
show typical value) (cont)
Pin No.
21
Terminal
name
MS OUT
DC
Zin voltage Equivalent circuit
——
MS VCC
Description
Music sensor
output to MPU
22 VCC
— VCC —
23 MS V
CC
20
D GND
— 0V —
27 MS GND
49, 50
48, 51
GND
FIN
— VCC/2
46, 53
45, 54
RIN
NFI
28 NOI
29 FFI
D GND
Power supply
Digital (Logic)
ground
Music sensor
ground
Ground
PB - EQ input for
forward
PB - EQ input for
reverse
Negative
feedback
terminal of PB -
EQ amp.
Negative
feedback input
for normal speed
Negative
feedback input
for FF or REW
Rev.1, Nov. 1992, page 5 of 66
5 Page 
Functional Description
HA12173 Series
Power Supply Range
HA12173 series are provided with four line output level, which will permit on optimum overload margin
for power supply conditions. And this series are designed to operate on either single supply or split supply.
Table 1 Supply Voltage
Item
Single supply
Split supply
GND level
V level
EE
HA12173
HA12174
7.0 V to 16.0 V 8.0 V to 16.0 V
±5.0 V to 8.0 V ±5.0 V to 8.0 V
±3.5 V to ±8.0 V ±4.0 V to 8.0 V
HA12175
9.5 V to 16.0 V
±5.0 V to 8.0 V
±4.8 V to 8.0 V
HA12177
12.0 V to 16.0 V
±6.0 V to 8.0 V
±6.0 V to 8.0 V
A. The lower limit of supply voltage depends on the line output reference level.
The minimum value of the overload margin is specified as 12 dB by Dolby Laboratories.
B. In case of using digital GND terminal referring to GND level, operating voltage range varies
depending on the condition at power on. On using the HA12173/174/175, use within the following
ranges to avoid latch-ups.
When power on in NR-OFF mode: ±5.0 V to ±8.0 V
When power on in NR-ON mode: ±5.7 V to ±8.0 V
C. In the reverse-voltage conditions such as ‘D-GND is higher than VCC’ or ‘D-GND is lower than
GND’, excessive current flows into the D-GND to destory this IC. To prevent such destruction, pay
attention to the followings on using.
Single power supply : Short-circuit the D-GND and GND directory on the board mounting this IC.
Split power supply : Avoid reverse conditions of D-GND and VCC or VEE voltage, including
transient-time of power ON/OFF.
Reference Voltage
For the single supply operation these devices provide the reference voltage of half the supply voltage that is
the signal grounds. As the peculiarity of these devices, the capacitor for the ripple filter is very small about
1/100 compared with their usual value. The Reference voltage are provided for the left channel and the
right channel separately. The block diagram is shown as figure 1.
Rev.1, Nov. 1992, page 11 of 66
11 Page | ||
| Páginas | Total 66 Páginas | |
| PDF Descargar | [ Datasheet HA12174.PDF ] | |
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