HA12155NT データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12155NT

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

Hitachi -> Renesas Electronics 

HA12155NT/HA12157NT

The minimum value of the headroom margin is specified as 12 dB by Dolby Laboratories. HA12155 series

are provided with two line output level, which will permit an optimum headroom margin for power supply

conditions.

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.

8

+

1 µF

52

VCC

+

–

L channel

reference

R channel

reference

–

+

13

Figure 1 The Block Diagram of Reference Voltage Supply

Operating Mode Control

HA12155NT/HA12157NT provides fully electronic switching circuits. NR-ON/OFF, C/B, and MPX

ON/OFF switches are controlled by parallel data (DC voltage) and other switches are controlled by serial

data.

Rev.4, Jun. 1997, page 14 of 57

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