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

Operating Mode Control

This IC provides fully electronic switching circuits. And each operating mode control is controlled by

parallel data (DC voltage).

Table 2 Threshold Voltage (Vth)

Pin No.

Lo

Mid

20, 21, 22, 23 0.0 to 2.5

—

Hi

4.0 to V

CC

Unit

V

Test Condition

Input Pin

Measure

V

24

Note:

0.0 to 1.0

2.0 to 3.0

4.0 to VCC

V

1. 20 to 23 pins are pulled down Lo level, and 24 pin is pulled to Mid level by the inside resistor

100kΩ.

2. Over shoot level and under shoot level of input signal must be the standardized.

(High: VCC, Low: –0.2V)

Block Diagram

This IC can be constructed for simple system which has little external parts by used the head serving both

as Recording and Play back because of REC return SW built-in.

With output Hi-Z of REC-EQ and input muting, this IC is realized not only REC mute attenuation

sufficiently but reducing pop noise in REC muting.

Note: Referring to Parallel Data Format also.

B head

A head

RECOUT

2

R1

4

5

PB IN (B)

8

PB IN (A)

–

+

Hi-Z SW

RETURN SW

B

+

A

–

REC - EQ

C9

29 Tape IN

C11

27 AUX IN

+

–

PBOUT

19

Vref

10

12

14 17

R18

R9

R7 C7

Normal Speed

Normal Tape

PB - A, Tape IN Select

Figure 2 Block Diagram (Lch)

Rev.2, Jun. 1997, page 8 of 34

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