HA12219NT Datasheet, PDF (8/29 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck

HA12219NT
Operating Mode Control
HA12219NT provides fully electronic switching circuits. And each operating mode control is controlled
by parallel data (DC voltage).
Table 2 shows the control voltage of each control input pin.
Table 2
Pin No.
18, 20
Control Voltage (Vth)
Lo
Mid
0.0 to 0.5
—
Hi
2.4 to V
CC
Unit
V
Test Condition
Input Pin Measure
V
19
Note:
0.0 to 0.5
1.2 to 1.8
2.4 to V_CC
V
1. Each pin is pulled down with 100 kΩ internal resistor. 16 to 18 pins are low-level when each pin
is open.
2. Over shoot level and under shoot level of input signal must be the standardized.
(High: Less than V_CC, Low: More than –0.2 V)
Block Diagram
Figure 2 shows the block diagram.
As this IC is built-in REC return switch, the configuration system can be simple system using a few
external component and the REC/PB head.
About these logics, please look at the Parallel Data Format.
B head
A head
REC-OUT(L)
2
4
5
PB-IN B(L)
8
PB-IN A(L)
7
REC - EQ
Return SW
B
+
A
−
10
13
REC-IN
22
PB-OUT
15
Normal Speed
PB-A
Vref
Figure 2 Block Diagram (Lch)
Rev.2, Jul. 1998, page 8 of 29