HA12215F View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HA12215F

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

Renesas Electronics 

HA12226F/HA12227F

Low-Boost

24.6dB

EQIN

4.8k

REC EQ

4.8k

EQOUT

BOOST

+C9(C19)

0.47µ

Figure 8 Example of Low Boost Circuit

External components shown figure 8 gives frequency response to take 6 dB boost. And cut off frequency can request it,

by C9 (C19).

REC Equalizer

The outlines of REC Equalizing frequency characteristics are shown by figure 9. Those peak level can be set up by

supplying voltage. (0 V to 5 V, GND = 0 V) to pin 10 (GPCAL).

And whole band gain can be set up by supplying voltage (0 V to 5 V, GND = 0 V) to pin 11 (RECCAL).

Both setting up range are ±4.5 dB. In case that you do not need setting up, pin 10, pin 11 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.

RECCAL

GPCAL

Frequency (Hz)

Figure 9 Frequency Characteristics of REC Equalizer

Bias Switch

The HA12215F built-in DC voltage generator for bias oscillator and its bias switches.

External resistor R20, R21 which corresponded with tape positions and bias out voltage are relater with below.

Vbias =..

R22

(R20 or R21) + R22

× (VCC − 0.7)

[V]

Bias switch follows to a logic of pin 19 (B / Norm / Crom).

Note: A current that flows at bias out pin, please use it less than 5 mA.

Rev.6.00 Jun 15, 2005 page 14 of 83

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