HA12219NT Datasheet, PDF (7/29 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck

Functional Description
Power Supply Range
HA12219NT is designed to operate on single supply, shown by table 1.
Table 1 Supply Voltage
Item
Single Supply
Power Supply Range
9.5 V to 15.0 V
HA12219NT
Reference Voltage
As AC reference (Vref) of this IC has not a current drivability, Vref fluctuates by A/B switching of PB-EQ.
Provided it causes you anxiety, please supply 7 pin with approximate 1/2 V_CC voltage.
For example, a suitable circuit is shown by figure 1.
This IC has a capacitor charger for the Vref, indicated to the pin interface circuit figure.
470 Ω
1 ^VCC
11 _GND
7 _Vref
+_{470 µF}
Lch PB-EQ Reference voltage
Lch REC-EQ Reference voltage
Rch REC-EQ Reference voltage
Rch PB-EQ Reference voltage
Figure 1 Reference Voltage Circuit
Rev.2, Jul. 1998, page 7 of 29