DUAL ELECTRONIC VOLUME CONTROL

S5A2250A01

INTRODUCTION

The S5A2250A01 is a CMOS designed for the electronization
of dual volume.
It is suitable for M/C, and car stereos.

FEATURES

Wide supply voltage range: V

= 6V

12V

(Backup is possible up to 4V)

Attenuation can be controlled from 0dB to

66dB by 2dB/step.

Controlling attenuation by means of the built in osc and the up/down terminals.

Single power supply operation as well as split power supply operation.

ORDERING INFORMATION

Device

Package

Operating Temperature

S5A2250A01-D0B0

DlP

300A

+70

DIP

300A

DUAL ELECTRONIC VOLUME CONTROL

S5A2250A01

PIN CONFIGURATION

PIN DESCRIPTION

Pin No.

Symbol

Descriptions

(

) power supply (GND)

2, 15

L-OUT1

R-OUT1

10dB/step atttenuator output. A signal applied to IN is attenuated in 7 steps from 0dB
to 60dB at 10dB

3, 14

L-IN1

R-IN2

10dB/step attenuator inputs

4, 13

A-GND

Analog ground

5, 12

L-IN2

R-IN2

2dB/step attenuator inputs

6, 11

L-OUT2

R-OUT2

2dB/step attenuator output. A signal applied to IN is attenuated in 5 steps from 0dB
to 60dB at 2dB

(+) power supply (V

)

INH

When at

level, normal operation

DCO

DC current output for displaying attenuation

OSC

R, C connecting pin for the oscillator

U/D

Attenuation up/down control input

L-OUT1

L-IN1

A-GND

L-IN2

L-OUT2

INH

DCO

R-OUT1

R-IN1

A-GND

R-IN2

R-OUT2

U/D

OSC

S5A2250A01

S5A2250A01

DUAL ELECTRONIC VOLUME CONTROL

ABSOLUTE MAXIMUM RATINGS (Ta = 25

ELECTRICAL CHARACTERISTICS

= 12V, f = 1kHz, Ta = 25

C, unless otherwise specified)

Characteristic

Symbol

Value

Unit

Supply Voltage

Power Dissipation

150

Operating Temperature

OPR

+ 75

Storage Temperature

STG

+ 125

Input Voltage

+ 0.3

- 0.3

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Circuit Current

DD1

DD2

= 13V

= 6V

0.1

1.0

0.8

2.5

2.0

Attenuator Resistor

RATT1

pin 3 - pin 4

pin 14 - pin 13

RATT2

pin 5 - pin 4

pin 12 - pin 13

Backup Current

BACKUP

= 4V, s/w1 = b

Input High Voltage

Input Low Voltage

up (down) s/w on

s/w1 = a

9.6

11.8

0.5

12.3

1.2

Total Harmonic

Distortion

THD

= 1.0 Vpp,

ATT = 10dB, f = 15kHz

0.005

0.01

Attenuator Error

ATT(ERR)

= 5 step

Max Input Amplitude

I(MAX)

THD = 1%, V

= max

1.0

2.5

4.0

Vrms

DCO Output current

O(DCO)

1 step

100

140

Cross Talk

ATT =

10dB

Operating Frequency

OSC1

OSC2

UP/SW ON, S/W 3 = a

S/W 3 = d

kHz

DUAL ELECTRONIC VOLUME CONTROL

S5A2250A01

APPLICATION INFORMATION

Setting of Attenuation

Attenuation is automatically set at the -40dB position when power is applied.

As soon as the UP key is pressed after power on, the U/P pin is placed in the up state at

level, and the oscilla-

tor is actuated.
When the DOWN key is pressed, the U/P pin is kept at

level as long as the DOWN key is pressed, and the

oscillator is actuated in the down State, decreasing the attenuation.
Oscillation frequency is decided by Cx & Rx.

-40dB

-38

-36

-34

-32

-30

-28

-30

-32

-34

-36

-38

-40

-42dB

VOLUME

LEVEL

OSC

UP/

DOWN

POWER

SUPPLY

OSC

= (Hz) (Rs

3Rx)

0.7Cx * Rx

S5A2250A01

DUAL ELECTRONIC VOLUME CONTROL

Attenuation Display Output

The S5A2250A01 is provided with the DC current output pin for displaying attenuation.
Steps of attenuation from 0 dB -

are shown in the table below.

The current of each step is increased or decreased approximately 100/uA.

* Current value may fluctuate depending upon the IC.
When high precision is required use a variable resistor as a load resistor.

STEP

DCO

ATTENUATION

64dB -

I = 100 uA + 30 uA

60dB -

62dB

2*1

54dB -

58dB

3*1

50dB -

52dB

4*1

44dB -

48dB

5*1

40dB -

42dB

6*1

34dB -

38dB

7*1

30dB -

32dB

8*1

24dB -

28dB

9*1

20dB -

22dB

10*1

14dB -

18dB

11*1

10dB -

12dB

12*1

4dB -

8dB

13*1

0dB -

2dB

DUAL ELECTRONIC VOLUME CONTROL

S5A2250A01

BACKUP

On the S5A2250A01, when power is off (S1 spon) or the INH pin is set at L (- VSS) level, all I/O pin are shut off and
current consumption is reduced to the minimum.
Backup by means of a capacitor (C1) becomes possible in this condition. Fig 6 shows an example of an application
when a backup capacitor is used.

NOTE: If V

-V

become below 4.0V, the backup is impossible.

Initialization When Power On

The S5A2250A01 has a built-in auto-initializing function for initialization when power is on. As the initializing system
is adopted through detection of supply voltage level, if rise of power supply is too fast, the initialization may not be
fully effected (no external initialization is necessary) In addition for effective initialization, it is necessary that the
INH pin is raised simultaneously with the supply voltage. Further, the initializing level is -40dB. It is recommended
to raise the supply voltage and the INH pin as illustrated Fig.

NOTE: If the voltage between V

and V

is below 4.0V, the auto-initializing function is actuated.

51K

10K

INH

S5A2250A01

-V

INH pin voltage

* V

-V

= 4V

T > 1ms

S5A2250A01

DUAL ELECTRONIC VOLUME CONTROL

APPLICATION CIRCUIT

1N4148

R1009

1000pF

S 1 A 0 0 6 5 A 0 1

S 5 A 2 2 5 0 A 0 1

K A 4 5 5 8 S

OP AMP

5.6V/1W

R202

C200

R200

R203

R204

C201

C208

C204

C203

R206

C205

R205

C206

R207

R264

R224

C210

R222

C211

R223

D202

D201

R225

Q202

R208

R221

C209

C207

C202

R209

C219

C230

C232

R226

C225

R227

C220

R228

C226

C231

C221

R229

C222

C227

R230

C233

C230

C229

R231

C234

D208

C218

C224

K A 4 5 5 8 S

OP AMP

R232

R211

R213

C214

R214

C215

C216

R215

R216

R217

R218

47k

R210

Q203

C945

C1008

A928

7805

CD B+

VR-UP

POWER

VR-DN

MUTE

P-SENS

GND

MICOM B+

CD PWC

POWER

VR-DN

MUTE

P-SENS

GND

MICOM B+

TAPE

AUX

TUNER

REC OUT

AC IN

220V 50Hz

VR-UP

SYNCR

REC B+

7809

IC200

R269

C213

R212

C237

R233

R235

C238

R234

R236

C945

R237

R238

Q204

Q207

C945

Q201

R265

C236

R220

1 1W

Q200

R241

R242

Q206

R240

Q205

R239

C243

R243

R245

R244

C244

D207

1N4001

R246 1 2 1W

RQ200

C245

R267

R266

Q210

A928

C235

Q209

C1008

C945

Q208

R268

IC203

IC202

IC201

C246

C247

OPTION

R251

R248

R255

R250

R249

R254

R253

R258

R252

R256

R260

R261

R263

R262

R257

D206

D205

D203

D204

C241

C238

C240

C239

C242

1N5404X5

DC IN

12V 1.5A

TRANS

FORMER

FROM

TAPE

SPEAKER

OUTPUT

F/16V

10k

100k

3.3k

100k

3.3k

F/16V

F/50V

4.7k

2.2

F/50V

2.2

F/50V

4.7k

47k

F/50V

10k

100

F/16V

100k

R201

100k

F/50V

15k

4.7

F/50V

10k

100

F/25V

2.2k

6.8k

2.2k

6.8k

2.2k

680

6.8k

2.2k

22k

R259

8.2k

F/50V

100

F/10V

C205

22k

2.2

F/50V

10k

15k

100

F/10V

C212

100

2.2k

3.9k

4.7k

4.7

F/50V

4.7

F/50V

10k

1000

F/10V

3.3

F/50V

100

2.2

F/50V

33k

100

F/25V

2.2

120

220

F/10V

F/16V

120

1000

F/10V

2.2

0.15

100

F/25V

4.7k

1000pF

F/50V

3.9k

4.7k

0.47

/50V

2.2k

6.8k

/25V

22k

1.5k

2200

F/25V

0.047

F X 5

F/50V

22k

1.5k

1/2W

1000

F/16V

2.2k

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: S5A2250A01

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: S5A2250A01