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HA12203NT

Audio Signal Processor for Cassette Deck (Dolby B-type NR with Recording System)

Hitachi -> Renesas Electronics 

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

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