HIT HA12211NT Datasheet

HA12211NT

Audio Signal Processor for Cassette Deck (Deck 1 Chip)

ADE-207-223A (Z)

2nd. Edition

June 1997

Description

HA12211NT is silicon monolithic bipolar IC providing REC equalizer system, PB equalizer system and
each electronic control switch in one chip.

Functions

• PB equalizer × 2 channel

• REC equalizer × 2 channel

• Each electronical control switch to change equalizer characteristics

• REC mute

• REC head return switch

Features

• REC equalizer is very small numb er of external parts.(4 types of frequency characteristics built-in )

• PB equalizer built-in. (A/B input changing system, 4 types of frequency characteristics)

• Independent PB sensitivity for A d eck, B d eck.

• Normal-speed/high-speed, normal tape/chr ome tape switching built-in.

• Controllable from direct micro-computer output.

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

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, 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

V

GND

V

I

CC

VCC Pin
REC-EQ output

REC Return

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

10k

V

10k

V

CC

V

CC

V’

GND

Reference

PB A Deck input

V

9 PB-IN A(R)

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

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, Ta = 25°C, No signal,

The value in the table show typical value.) (cont)

Pin No. Pin Name Note Equivalent Circuit Pin Description

10 PB-NF (L) V = Vref

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

13 PB-EQ (R)
14 PB-Cal A(L) V = Vref

V

CC

V

139k

V

GND

V

CC

PB EQ Feed back

NAB Output

Feed back input
for gain
adjustment

15 PB-Cal A(R)
16 PB-Cal B(R)
17 PB-Cal B(L)
26 AUX (R) V = Vref

27 AUX (L)
28 TAPE (R)
29 TAPE (L)

10k

7Vref V

100k

7Vref V

V

CC

REC-EQ input

Rev.2, Jun. 1997, page 3 of 34

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, Ta = 25°C, No signal,

The value in the table show typical value.) (cont)

Pin No. Pin Name Note Equivalent Circuit Pin Description

18 PBOUT (R) V = Vref

19 PBOUT (L)
20 A/B I = 20µA

21 HSP
22 Acr
23 Bcr
24 REC-SEL I = 20µA

V = 2.5V

V

CC

V

GND

V

CC

I

22k

100k

GND

V

I

CC

PB output

Mode control input

Mode control input

100k

25 IREF V = 1.2V

V

50k

GND

Equalizer
reference current
input

V

30 GND GND Pin

Rev.2, Jun. 1997, page 4 of 34

Block Diagram

CC

GND

V

HA12211NT

to Dolby

REC IN from logic

)

: 100kB
R

(L)

(R)

(L)

R

(L)

B

A/B

HSP

ACr

BCr

IREF

AUX

AUX

TAPE(

TAPE

)

R

(

B

)

L

(

B

(R)

PB-OUT

PB-OUT

19 18 17 16

21 20

22

REC-SEL

30 29 28 27 26 25 24 23

GND

PB-CAL

PB-CAL

L-ch

12dB

R-ch

B

: 100kB

B

PB-CAL

PB-CAL

–

+

10k

A

B

12 13 14 15

PB-EQ PB-EQ

PB-NF

10 11

9

5k 2.7k 2.26k 1.12k

–

+

139k

PB-IN PB-IN PB-NF

A

REC-EQ

PB-IN PB-IN

REC-RETURN

R

)

R

(

A

)

L

(

A

)

R

)(

L

(

0.022µ

)

R

(

0.022µ

)

L

470 470

)(

R

(

A

)

L

(

A

VREF

)

R

(

B

)

L

(

B

C : F

Unit R : Ω

470µ

+

R-ch

REC-OUT

(R)

470

Bias

470

L-ch

REC-OUT

(L)

5.6k 5.6k

CC

12345678

V

Rev.2, Jun. 1997, page 5 of 34

HA12211NT

Parallel Data Format

Pin No. Pin Name L M H

22 A CrO2 *
23 B CrO2 *

1, *3

1, *2, *3

21 HSP Normal speed *
20 A/B Ain active *

1, *3

Return SW ON *

REC OUT active *3—REC OUT Hiz
24 REC IN SEL TAPE MUTE *
Note: 1. PB-EQ LOGIC

HSP
LH
A/B

A CrO2 B CrO2 L H L H

L L 120µ 120µ 60µ 60µ
L H 120µ 70µ 60µ 35µ
HL70µ 120µ 35µ 60µ
HH70µ 70µ 35µ 35µ

—*
—*

3

—Hi speed
— Bin active *

3

— Return SW OFF

3

1

1, *2

1

AUX

2. REC-EQ LOGIC

HSP

B CrO2 L H

L Normal speed

TAPE I

H Normal speed

II

TAPE

3. Unforced pin state

High speed
TAPE I

High speed

II

TAPE

Rev.2, Jun. 1997, page 6 of 34

HA12211NT

Functional Description

Power Supply Range

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

Table 1 Spply Voltage

Item Power Supply Range

Single Supply 9.5V to 15.0V

Reference Voltage

So little is the current drivability of AC refer ence (Vr ef) that the Vref voltage may be altered by A/B
switching of PB-EQ.

Provided it causes you anxiety, please use the constant 1/2 V

In addition, this IC has a capacitor charger for Vref pin.

V

CC

1

470Ω

30

GND

7

Vref

+

470µF

Figure 1 Reference Voltage Circuit

voltage circuit, for example, figure 1.

CC

Lch PB-EQ reference voltage

Lch REC-EQ reference voltage

Rch REC-EQ reference voltage

Rch PB-EQ reference voltage

Rev.2, Jun. 1997, page 7 of 34

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 Hi Unit Test Condition

20, 21, 22, 23 0.0 to 2.5 — 4.0 to V

CC

V

Input Pin Measure

V

24 0.0 to 1.0 2.0 to 3.0 4.0 to V

CC

V

Note: 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 standardi ze d.
(High: V

, Low: –0.2V)

CC

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.

C9

Tape IN

29

C11

AUX IN

27

19

PBOUT

+

–

B head

A head

RECOUT

R1

PB IN (B)

PB IN (A)

2

4

5

8

Hi-Z SW

RETURN SW

B

A

–

REC - EQ

+

+

–

Vref

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

10 12

R7 C7

Figure 2 Block Diagram (Lch)

14

17

Normal Speed
Normal Tape
PB - A, Tape IN Select

R18
R9

HA12211NT

Level Diagram

It is the target that total play back output level is adjusted to 3 00mV; 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 valu e mor e 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

HA12134A

11.3mV

0.6mV

100kΩ

25.5dB 0 to 20.8dB 20dB

+

–

10kΩ

100kΩ VR

VR = 11kΩ

Dolby IC

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

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

HA12211NT

REC-EQ clip level

1.8V

300mV

(Dolby Level)

100mV

1kHz

Dolby IC

263mV

REC-EQ

Figure 4 REC Level Diagram (Normal Speed, Normal Tape, 1kHz)

5.6kΩ
R1

Rev.2, Jun. 1997, page 10 of 34

HA12211NT

Absolute Maximum Rating (Ta = 25°C)

Item Symbol Rating Unit Note

Max supply voltage V
Power dissipation P
Operating temperature Topr –40 to +75 °C
Storage temperature Tstg –55 to +125 °C
Operating voltage Vopr 9.5 to 15 V

max 16 V

CC

d

500 mW Ta ≤ 75°C

Rev.2, Jun. 1997, page 11 of 34