HA12155NT View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HA12155NT

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

Hitachi -> Renesas Electronics 

HA12155NT/HA12157NT

A deck

PB EQ

Compensation

of low

frequency

region

PB EQ

B deck

RPI PBI

REC OUT

REC IN VRI

HA12155 / 7

EQ IN

EQ OUT

REC PB

PB OUT

Figure 6 Application for Dubbing Deck

Injector Current

HA12155NT/HA12157NT has logic circuit which is fabricated by I2L into IC. To operate this circuit, it is

required enough injector current. Injector current goes into from the INJ pin (pin 10) and external resistor

is required to connect to this pin for adequate current. The value of external resistor is obtained by using

following equations. And put them with ±10% tolerance value which is calculated. VINJ can allow to

connect to VCC shown below. Under the condition of high temperature, the mis-operation of logic is caused

by large injector current. Also, under the condition of low temperature, the stop of logic is caused by small

injector current. Therefore, pay attention to have good stability of VINJ.

R INJ

=

VINJ – 0.7

3.6

[kΩ] ---- Single supply

R INJ

=

VINJ

+ VEE

3.6

– 0.7

[kΩ] ---- Split supply

R INJ

10

3.6 mA

HA12155 / 7

VINJ

40

61

R INJ

10

3.6 mA

HA12155 / 7

VINJ

40

61

VEE

a) Single supply use

b) Split supply use

Figure 7 Injector Current Application

Rev.4, Jun. 1997, page 20 of 57

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