HA12203NT Datasheet, PDF (15/97 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System)

HA12203NT/HA12204NT
REC Equalizer
The outlines of REC Equalizing frequency characteristics are shown by figure 10. Those peak level can be
set up by supplying voltage. (0 V to 5 V, GND = 0 V) to 30pin (GPCAL).
And whole band gain can be set up by supplying voltage (0 V to 5 V, GND = 0 V) to 31pin (RECCAL).
Both setting up range are ± 4.5dB. In case that you don't need setting up, 30 pin, 31pin should be open
bias.
Note: Depending on the employed REC/PB head and test tape characteristics, there is a rare case that the
REC-EQ characteristics of this LSI can not be matched to the required characteristics because of
built-in resistors which determined the REC-EQ parameters in this care, please inquire the
responsible agent because of the adjustment of built-in resistor is necessary.
Since an output pin and an input pin for REC-EQ are adjacent, it will easily oscillate if patterns run
abreast.
RECCAL
GPCAL
Frequency (Hz)
Figure 10 Frequency Characteristics of REC Equalizer
Rev.3, Jun. 1999, page 15 of 97