HA12167FB Datasheet, PDF (18/73 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck (Deck 1 Chip)

HA12167FB/HA12169FB
Application Note
Power Supply Range
HA12167FB/HA12169FB are designed to operate on either single supply or split supply.
The operating range of the supply voltage is shown in table 1.
Table 1 Supply Voltage
Type No.
HA12167FB
HA12169FB
Single Supply
12 V to 15 V
11 V to 15 V
Split Supply
±6.0 V to 7.5 V
±6.0 V to 7.5 V
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. HA12167 series
are provided with two line output level, which will permit an optimum overload margin for power supply
conditions.
Reference Voltage
For the single supply operation these devices provide the reference voltage of half the supply voltage that is
the signal grounds. As the peculiarity of these devices, the capacitor for the ripple filter is very small about
1/100 compared with their usual value. The Reference voltage are provided for the left channel and the
right channel separately. The block diagram is shown as figure 1.
77
+
1 µF
V_CC
61
+
–
L channel
reference
R channel
reference
–
+
80
Figure 1 The Block Diagram of Reference Voltage Supply
Rev.3, Jun. 1997, page 18 of 73