HA12211NT データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12211NT

Audio Signal Processor for Cassette Deck (Deck 1 Chip)

Hitachi -> Renesas Electronics 

HA12211NT

Level Diagram

It is the target that total play back output level is adjusted to 300mV; Dolby level, which the PB system

gain in all is included of external amplifier’s (Dolby IC etc.) as follows figure 3. Though A head

adjustment is independent of B, select the value of R9, R18 adequately.

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

The level diagram at 1kHz is shown by figure 4.

Note: 1. R1 needs the value more than 1kHz.

2. Depending on the employed REC/PB head and test tape characteristics, there is rare case that

the REC-EQ frequency characteristics of this IC can not be matched to the required

characteristics because of built-in resistors which determined the REC-EQ parameters in this

case, please inquire the responsible agent because of the adjustment of built-in resistors is

necessary.

300mV

(Dolby Level)

23.9mV

11.3mV

HA12134A

100kΩ VR = 11kΩ

0.6mV

25.5dB 0 to 20.8dB

+

–

10kΩ 100kΩ VR

20dB

Dolby IC

Figure 3 PB Level Diagram (Normal Speed, Normal Tape, 1kHz)

Rev.2, Jun. 1997, page 9 of 34

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