HA12155 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12155

Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)

Hitachi -> Renesas Electronics 

HA12155NT/HA12157NT

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 VCC/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 kΩ) 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.

C28

2200 p

±5%

C29

2200 p

±5%

R29

18 k

±2%

57

R24

22 k

51 ±2% 50

R23

560 C27 C26

± 2%

2200 p 0.1 µ

±5% ±10%

49

48

47

46

C25

0.1 µ

±10%

BIAS

PB OUT SS1 SS2

CCR HLS

LLS

(L)

(L)

(L)

(L) DET(L) DET(L)

HA12155/7 (REC 1 Chip)

Unit R : Ω

C:F

PB OUT SS1

SS2 CCR HLS

LLS

(R)

(R)

(R)

(R) DET(R) DET(R)

14

15

16

R11

22 k

±2%

R13

560

±2%

C9

2200 p

±5%

C10

2200 p

±5%

17

18

19

C12

C13

2200 p 0.1 µ

±5%

±10%

C14

0.1 µ

±10%

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.

Rev.4, Jun. 1997, page 21 of 57

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