參數(shù)資料
型號(hào)： HA12155
廠商： Hitachi,Ltd.
英文描述： Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)
中文描述： 音頻信號(hào)處理器（杜比B / C型與錄音系統(tǒng)星期日的盒式收錄機(jī)）
文件頁(yè)數(shù)： 21/57頁(yè)
文件大?。?/td> 463K
代理商： HA12155
HA12155NT/HA12157NT
Rev.4, Jun. 1997, page 21 of 57
Gain Control of Electronic Volume
HA12155NT/HA12157NT is designed in order to change the gain by 6 bit DAC fabricated into IC. To
reduce the click noise when changing volume gain instantaneously, required to connect the capacitor (CR
time constant) to CNT pin (pin 6,59). These terminals are also be used as output pin of DAC. Therefore,
by forcing voltage or current to these terminals, it is applicable to control volume gain directly. But,
voltage forced to these terminals must be from V
CC
/2 –2 V to V
CC
/2 (for split supply use, –2 V to 0 V) in this
case. In case of forcing the current these pins, voltage must be the value mentioned above even it is ±20%
distributed of internal resistor (5.2 k
) of CNT pin. And, these case, change of a gain depending on a
temperature gets large.
The Tolerances of External Components for Dolby NR-Block
For adequate Dolby NR tracking response, take external components shown below.
For smooth capacitors of C13, C14, C25 and C26, please employ a few object of the leak, though you can
be useful for an electrolytic capacitor.
C25
0.1
10%
C26
0.1
10%
C27
2200 p
5%
±
R23
560
2%
±
C29
2200 p
5%
±
C28
2200 p
5%
±
R24
22 k
2%
±
R29
18 k
2%
±
57
51
50
49
48
47
46
14
15
16
17
18
19
BIAS
PB OUT
(L)
SS1
(L)
SS2
(L)
CCR
(L)
HLS
DET(L)
LLS
DET(L)
PB OUT
(R)
SS1
(R)
SS2
(R)
CCR
(R)
HLS
DET(R)
LLS
DET(R)
R11
22 k
2%
±
C9
2200 p
5%
±
C10
2200 p
5%
±
R13
560
2%
±
C12
2200 p
5%
±
C13
0.1
10%
C14
0.1
10%
Unit R :
C : F
μ
μ
μ
μ
HA12155/7 (REC 1 Chip)
Figure 8 Tolerances of External Components
Level Meter
The coupling capacitor of LMIN pin (21 pin and 44 pin).
For these capacitors please employ a small object of the leak.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA12155NT 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)
HA12155NT/HA12157NT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HA12157NT 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)
HA12159 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FM Receiver Circuit
HA12160 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Audio Signal Processor for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)
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