HA12179F Datasheet, PDF (11/40 Pages) Hitachi Semiconductor – Audio Signal Processer for Car Deck and Cassette Deck(Dolby B-type NR with PB Amp)

HA12179F
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
14 15 16 17 18 –0.2 to 1.0
3.5 to 5.3
V
19
Test condition
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 kΩ 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 kΩ 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 kΩ.
INPUT Pin
10 to 22kΩ
+
1 to 22µF
MPU
Figure 2 Interface for Reduction of Pop Noise
Rev.1, Apr. 1994, page 11 of 40