HA12230NT View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HA12230NT

Audio Signal Processor for Cassette Deck

Renesas Electronics 

HA12230NT

Level Diagram

The gain establishment of PB-EQ considers PB output level {(internal Line Amp. + PB Amp.) = 580 mV

(Dolby Level)} like figure 3 at the target.

After replace RA and RB with a half-fix volume, adjust level.

Regarding REC-EQ adjust the gain in front of input to this IC.

The level diagram of 1 kHz is shown figure 3.

Similarly to PB, it consider Dolby level as a standard. And R1 needs the value more than 5.6 kΩ.

Because mode establishment resistances are built-in, REC-EQ frequency characteristics are respectively

fixed value.

In case the change of the frequency characteristics are necessary, please inquire the responsible agent

because the adjustment of resistors is necessary.

0.6 mV PB-EQ

41.2 dB

Line Amp.

25.7 dB

68 mV 30 mV

580 mV

RA

RB

Figure 3 PB System Level Diagram

Line Mute

HA12230NT is built-in with mute circuit to Line Amp.

A mute control does with High/Low of pin 19.

Reducing pop noise is so much better 10 kΩ to 22 kΩ resistor to pin 19 in series and 1 µF to 22 µF

capacitor.

A mute is not built-in when doing a power ON/OFF.

Please correspond to it, on the side of a set system.

Test Mode

Test mode becomes if it is resistor less than 10 kΩ of pin 12.

Please use resistor of 22 kΩ on the occasion of mount.

Rev.6, Nov. 2000, page 9 of 32

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