HA12179F datasheet(11/40 Pages) HITACHI

Part #	HA12179F

Description	Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp)

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Manufacturer	HITACHI [Hitachi Semiconductor]

Direct Link	http://www.renesas.com/eng

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11 / 40 page

HA12179F

Rev.1, Apr. 1994, page 11 of 40

Operating Mode Control

HA12179F provides electronic switching circuits. And each operating mode control are controlled by

parallel data (DC voltage).

Table 2

Threshold Voltage (V

TH)

Pin No.

Lo

Hi

Unit

Test condition

14 15 16 17 18

19

–0.2 to 1.0

3.5 to 5.3

V

Input Pin

Measure

V

Table 3

Switching Truth Table

Pin No.

Lo

Hi

14

NR-OFF

NR-ON

15

PB

REC

16

MUTE-OFF

MUTE-ON

17

120 µ (NORMAL)

70 µ (METAL or CHROME)

18

FORWARD

REVERSE

19

SER (FF or REV)

REP (NORMAL SPEED)

Notes: 1. Each pins are on pulled down with 100 k

Ω internal resistor.

Therefore, it will be low-level when each pins are open.

2. Over shoot level and under shoot level of input signal must be the standardized (High: 5.3 V,

Low: –0.2 V)

3. Reducing pop noise is so much better for 10 k

Ω to 22 kΩ resistor and 1 µF to 22 µF capacitor

shown Fig 2. But the resistor connected to MUTE terminal (pin 16) should be under 10 k

Ω.

INPUT Pin

10 to 22k

Ω

MPU

1 to 22

µF

+

Figure 2 Interface for Reduction of Pop Noise

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HA12179F Datasheet(PDF) 11 Page - Hitachi Semiconductor

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