HA12226F Datasheet, PDF (17/86 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12226F/HA12227F
R1
RIN
ROUT
15k
25.5mV 21.4dB 300mV
Input
56
8
Output
C2
0.1µ _ALC
C4
55
R2
ALC
9 _{ALCIN R12}
2.2k
13 _ALCDET
V_CC
C12
Figure 12 ALC Block Diagram
ALC Operation Level Necessary
ALC operation level is variable to pin 12 bias (ALC-CAL: 0 to 5 V), and its range is ±4.0 dB.
Unnecessary, pin 12 is unforced.
ALC-CAL = 5V
ALC-CAL = 0V
RIN
Figure 13 ALC-CAL Characteristics
About a Test Pin (Pin 2)
The HA12227F does for testing exclusive terminal for pin 2.
In mount circuit, this terminal is open or connected to GND with a resistor of 33 kΩ.
Rev.6, Dec. 2000, page 17 of 86