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HA12155NT Fiches technique(PDF) 21 Page - Hitachi Semiconductor

No de pièce HA12155NT
Description  Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)
Download  57 Pages
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Fabricant  HITACHI [Hitachi Semiconductor]
Site Internet  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HA12155NT Fiches technique(HTML) 21 Page - Hitachi Semiconductor

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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 VCC/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
Ω) 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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