HA12226F Datasheet, PDF (10/84 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12226F/HA12227F
Functional Description
Power Supply Range
These ICs are designed to operate on single supply.
Table 1 Supply Voltage
Product
Power Supply Range (Single Supply)
HA12226F
11.0 V to 15.0 V
HA12227F
9.5 V to 15.0 V
Note: The lower limit of supply voltage depends on the line output reference level.
The minimum value of the overload margin is specified as 12 dB by Dolby Laboratories (Dolby IC HA12226F).
Reference Voltage
The reference voltage are provided for the left channel and the right channel separately. The block diagram is shown as
figure 1.
21 ^VCC
+
−
V_CC
+
−
+
−
50 _GND 49_+R1µIP
L channel reference
Music sensor reference
R channel reference
Unit C: F
Figure 1 Reference Voltage
Operating Mode Control
The HA12226F/HA12227F provide fully electronic switching circuits. And each operating mode control is controlled
by parallel data (DC voltage).
Table 2 Control Voltage
Pin No.
Lo
Mid
15, 16, 17, 18, −0.2 to 1.0

20,
22, 23*⁴, 25
Hi
4.0 to V_CC
Unit
V
Test Condition
Input Pin Measure
19, 24
−0.2 to 1.0
2.0 to 3.0
4.0 to V_CC
V
Notes: 1. Each pins are on pulled down with 100 kΩ internal resistor.
Therefore, it will be low-level when each pins are open.
But pin 24 is mid-level when it is open.
2. Over shoot level and under shoot level of input signal must be the standardized (High: V_CC,
Low: −0.2 V).
3. For reduction of pop noise, connect 1 µF to 22 µF capacitor with mode control pins.
But it is impossible to reduce completely in regard to Line mute, therefore, use external mute at the same
time.
4. Non connection regarding the HA12227F.
Rev.6.00 Jun 15, 2005 page 10 of 83