HIT HA12207NT Datasheet

HA12207NT

Audio Signal Processor for Cassette Deck

ADE-207-197B (Z)

3rd Edition

Jun. 1999

Description

HA12207NT is silicon monolithic bipolar IC providing PB equalizer, REC equalizer system and each
electronic control switch in one chip.

Functions

• PB equalizer × 2 channel

• REC equalizer × 2 channel

• Each electronic control switch to change REC/PB etc.

• REC MUTE

• REC head return switch

Features

• REC equalizer is very small number of extern al parts, built-in 2 types of frequency characteristics.

• PB equalizer circuit built-in.

• REC /PB of high speed mode are possible with TYPE 1(Normal tape).

• Controllable from direct micro-computer output.

• Available to reduce substrate-area because of high integration and small external parts.

• As the pins arrangement resembles HA12185NT, it can design the board that is replaced with

HA12185NT.

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, Ta = 25°C, No signal,

The value in the table show typical value.)

Pin No. Pin Name Note Equivalent Circuit Pin Description

1V

CC

V = V

CC

2 RECOUT (L) V = Vref

3RECOUT (R)
4 REC-RETURN V = Vref

V ’= Vref

V

CC

GND

I

VCC pin
REC-EQ output

V

REC return

CC

V4

5 pin, 6 pin

I

GND

V’

5 PB-IN B (L) PB B Deck input
6 PB-IN B (R)
7VREF V = Vref

V’ = V

/ 2

CC

8 PB-IN A (L) V = Vref

PB-IN

V

–+

10k

V'

10k

V

CC

V

Reference

V

CC

GND

PB A deck input

9 PB-IN A (R)

Rev.3, Jun. 1999, page 2 of 27

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, Ta = 25°C, No signal,

The value in the table show typical value.)

Pin No. Pin Name Note Equivalent Circuit Pin Description

10 PB-NF (L) PB-IN = Vref

V

CC

PB-IN

PB EQ feed back

11 PB-NF (R)
12 PB-EQ (L) PBOUT = Vref

13 PB-EQ (R)
20 REC IN (R) V = Vref

21 REC IN (L)
14 PBOUT (R) V = Vref

180

330k

7

NAB output

PBOUT

GND

V

CC

100k

7Vref

V

CC

REC-EQ input

V

PB output

15 PBOUT (L)

GND

Rev.3, Jun. 1999, page 3 of 27

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, Ta = 25°C, No signal,

The value in the table show typical value.)

Pin No. Pin Name Note Equivalent Circuit Pin Description

16 A/B I = 20µA

17 HSP
18 MUTE
19 IREF V = 1.9V

V

I

22k

100k

GND

V

Mode control input

CC

Equalizer
reference current
input

22 GND GND pin

Rev.3, Jun. 1999, page 4 of 27

Block Diagram

CC

GND

V

HA12207NT

C : F

Unit R : Ω

0.01µ 0.01µ

)

R

)(

L

(

(R)

(L)

/B

(R)

PB-EQPB-EQ

13 12

14

PB-OUT

PB-OUT

HSP

IREF

REC-IN

60µ

R-ch

12dB

120µ

L-ch

–

+

R-ch

AB

REC-EQ

11

)

R

PB-NFPB-NFPB-INPB-INPB-INPB-IN

10

)(

L

9

)(

R

(

A

)

L

(

A

VREF

470µ

+

)

R

(

B

)

L

(

B

REC-RETURN

(R)

REC-OUT

Bias

REC-IN

(L)

22 21 20 19 18 17 16 15

GND

L-ch

(L)

REC-OUT

CC

12345678

V

5.6k 5.6k

Rev.3, Jun. 1999, page 5 of 27

HA12207NT

Parallel Data Format

Pin No. Pin Name L H

17 HSP Normal * Hi speed
16 A/B Ain active * Bin active

Return SW ON * Return SW OFF

REC OUT active * REC OUT HIZ
18 MUTE MUTE ON * MUTE OFF
Note: Unforced pin state

Rev.3, Jun. 1999, page 6 of 27

HA12207NT

Functional Description

Power Supply Range

HA12207NT is designed to operate on single supply, shown by table 1.

Table 1 Supply Voltage

Item Power Supply Range

Single Supply 9.5V to 15.0V

Reference Voltage

As AC reference (Vref) of this IC has not a curr ent drivability, Vref fluctuates by A/B switching of PB-EQ.
Provided it causes you anxiety, please supply 7 pin with approximate 1/2 V
For example, a suitable circuit is shown by figure 1.
This IC has a capacitor charger for the Vref, indicated to the pin interface circuit figure.

voltage.

CC

470Ω

V

CC

1

22

GND

7

Vref

+

470µF

Figure 1 Reference Voltage Circuit

Lch PB-EQ Reference voltage

Lch REC-EQ Reference voltage

Rch REC-EQ Reference voltage

Rch PB-EQ Reference voltage

Rev.3, Jun. 1999, page 7 of 27

HA12207NT

Operating Mode Control

HA12207NT provides fully electronic switching circuits. And each operating mode control is controlled by
parallel data (DC voltage).

Table 2 shows the control voltage of each control input pin.

Table 2 Control Voltage (Vth)

Pin No. Lo Hi Unit Test Condition

16, 17 0.0 to 1.0 4.0 to V

CC

V

Input Pin Measure

V

18 0.0 to 3.0 4.0 to V

CC

V

Note: 1. Each pin is pulled down with 100kΩ internal resistor. 16 to 18 pins are low-level when each pin is

open.

2. Over shoot level and under shoot level of input signal must be the standardi ze d.
(High: Less than V

, Low: More than –0.2V)

CC

Block Diagram

Figure 2 shows the block diagram.
As this IC is built-in REC return switch, the configuration system can be simple system using a few

external component and the REC/PB head.
As this IC adopted Hi-z SW of REC-EQ output and the input mute system, it realizes REC mute

attenuation and pop-noise reduction securing in REC mute.
About these logics, please look at the Parallel Data Format.

REC IN

21

PBOUT

15

B head

A head

RECOUT

PB IN(B)

PB IN(A)

2

4

5

8

Hi-Z SW

RETURN SW

B

A

–

REC - EQ

+

+

–

Vref

Rev.3, Jun. 1999, page 8 of 27

7

10 13

Figure 2 Block Diagram (Lch)

Normal Speed
PB - A

HA12207NT

Level Block Diagram

The gain establishment of PB-EQ considers PB output level {(external AMP+PB AMP)=300mV(Dolby
Level)} like figure 3 as the target.

Regarding REC-EQ adjust the gain in front of input to this IC.
The level diagram of 1kHz is shown figure 4. (Normal speed)
Similarly to PB, it consider Dolby level as a standard. And R1 needs the value more than 5.6kΩ.
Because mode establishment resistances are built-in, REC-EQ frequ e n cy characteristics are respectiv ely

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

because the adjustment of resistors is necessary.

300mV

(Dolby level)

63.6mV

HA12134A

0.6mV

40.5dB 20dB

PB-EQ

Dolby IC

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

Rev.3, Jun. 1999, page 9 of 27