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ANGUS ELECTRONIC COMPANY LIMITED Princeton Technology Corp.

Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

DESCRIPTION PT2253A is an electronic volume controller IC utilizing CMOS Technology specially designed for use on audio equipments. It has two (2) built-in channels making it ideally suitable for mono and stereo sound applications. PT2253A provides a wide frequency response range and a very low harmonic distortion to mention a few; thereby guaranteeing a highly effective and reliable performance.

FEATURES ❒ ❒ ❒ ❒ ❒ ❒ ❒ ❒ ❒ ❒

CMOS Technology Low Power Consumption Operating Voltage Range : Vcc = 6 ~ 12 V (Backup Voltage is up to 4 V) 0dB to -68dB attenuation controlled by 2dB/step 2 Channels in each chip Capable to control attenuation by a built-in oscillator and Up/Down Pin Single Power Supply or Dual Power Supplies of (+) and (-) can be used Wide Frequency Response Range Very Low Harmonic Distortion Available in 16 pin, DIP Package

APPLICATIONS ❒ ❒

Audio Equipment Volume Control Traditional VR Replacement

PT2253A v 2.6

Page 1

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

BLOCK DIAGRAM Vcc

U/D

U/D CK

OSC

INH

Vss

7 BITS BIDIRECTIONAL SHIFT REGISTER

U/D

INT

CK

5 BITS BIDIRECTIONAL SHIFT REGISTER

AUTO INITIALIZE CIRCUIT INT

OSC

CONSTANT CURRENT CIRCUIT

DCO

Vcc L-OUT1 R-OUT1

A-SW A-SW A-SW A-SW A-SW A-SW

CK 7 BITS LATCH CIRCUIT

A-SW

7 BITS LATCH CIRCUIT

CK L-IN1

CK

CK

R-IN1

A-SW A-SW A-SW A-SW A-SW A-SW A-SW

A-GND

A-SW A-SW A-SW A-SW A-SW

CK

CK 6 BITS LATCH CIRCUIT

L-IN2

6 BITS LATCH CIRCUIT

A-GND

CK

CK

A-SW L-OUT2

R-IN2

A-SW A-SW A-SW A-SW A-SW A-SW

R-OUT2

PIN CONFIGURATION Vss

1

16

Vcc

L-OUT1

2

15

R-OUT1

L-IN1

3

14

R-IN1

A-GND

4

13

A-GND

L-IN2

5

12

R-IN2

L-OUT2

6

11

R-OUT2

INH

7

10

U/D

DCO

8

9

OSC

PT2253A PT2253A v 2.6

Page 2

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

PIN DESCRIPTION

Pin Name

Pin No.

I/O

Description

Vss L-OUT1

1 2

Power O

L-IN1 A-GND L-IN2

3 4 5 6

I GND I O

7

I

DCO OSC U/D R-OUT2 R-IN2 A-GND R-IN1 R-OUT1

8 9 10 11 12 13 14 15

O I/O I O I GND I O

Vcc

16

Power

Negative Power Supply 10dB/Step Attenuator Output A signal applied to ‘IN’ is attenuated into 7 steps from 0dB to -60dB. 10dB/Step Attenuator Input Analog Ground Pin 2dB/Step Attenuator Input 2dB/Step Attenuator Output A signal applied to ‘IN’ is attenuated into 5 steps from 0dB to -8dB. Inhibit Terminal. At “L” level, all inputs and outputs are disabled. At “H” level, operation is normal. DC Current Output Pin RC Connecting Pin for the Oscillator Attenuator Up/Down Control Pin 2dB/Step Attenuator Output, same as L-OUT2. 2dB/Step Attenuator Input, same as L-IN2. Analog Ground Pin 10dB/Step Attenuator Input, same as L-IN1. 10dB/Step Attenuator Output, same as LOUT1. Positive Power Supply

L-OUT2

INH

PT2253A v 2.6

Page 3

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

FUNCTIONAL DESCRIPTION Attenuation Setting The Attenuation can be increased or decreased depending on the state of the U/D Pin (either “H” or “L” Level) by actuating the built-in oscillator. When power is applied, the attenuation is automatically set at -40dB.

When the DOWN Key is pressed, the U/D Pin goes to the “L” Level and the oscillator is actuated in the down state. Thus, attenuation is increased. Conversely, when the UP Key is pressed, the U/D Pin goes to the “H” Level and the oscillator is actuated in the up state. Thus, attenuation is decreased. Oscillation frequency (fosc) is dependent on the Cx and the Rx and is determined by the following equation:

PT2253A v 2.6

Page 4

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

Vcc

16 Cx

Rs

OSC 9

OSC Vcc

Rx U/D 10 UP

DOWN 1µF

Rx = 33 K Cx = 4.7 uF Rs = 100 K

Vss

PT2253A has a DC Current Output Pin (DCO). The output level is divided into 13 steps. Please refer to the table below: STEP 0 1 2 3 4 5 6 7 8 9 10 11 12 13 PT2253A v 2.6

DCO 0 I 2I 3I 4I 5I 6I 7I 8I 9I 10I 11I 12I 13I

ATTENUATION -64dB ~ ∞ -60dB ~ -62dB -54dB ~ -58dB -50dB ~ -52dB -44dB ~ -48dB -40dB ~ -42dB -34dB ~ -38dB -30dB ~ -32dB -24dB ~ -28dB -20dB ~ -22dB -14dB ~ -18dB -10dB ~ -12dB -4dB ~ - 8dB 0dB ~ -2dB Page 5

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

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

Attenuator Attenuator 1 attenuates 0 ~ -60dB at 10dB/step. Attenuator 2 attenuates 0 ~ -8dB at 2 dB/step.

PT2253A v 2.6

Page 6

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

If there is the possibility of excessive voltage in the attenuator, it is recommended that a protective diode be inserted. Please refer to the diagram below. Vcc

Vcc IN

Vss Vss

Power Supply DUAL POWER SUPPLY

+Vcc Vcc

U/D

OSC

OSC

0V

A-GND Vss

INH

U/D

-Vss

DCO DC UP

Vcc

DOWN

SINGLE POWER SUPPLY +

Vcc

U/D

OSC

A-GND Vss

INH

DCO +Vcc

1/2 VDD

(A-GND)

DC

0V (Vss)

Vcc

PT2253A v 2.6

Page 7

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

Initialization When Power ON PT2253A has the built-in auto-initializing function for the during the Power ON period. It has the power supply on reset for the initialization of the chip. If the power supply rises too fast, the initialization may not be fully effected. For initialization to be fully effective, it is necessary to satisfy the following conditions: 1. The INH Terminal must be raised simultaneously with the Supply Voltage. 2. Initial attenuation level is -40dB Please refer to the following diagram.

Vcc-Vss = 4.0 V Vcc-Vss or INH TERMINAL VOLTAGE

T

1 msec

T

* If Vcc-Vss drops below 4.0 V, the auto-initializing function is actuated.

Back Up When Power OFF When INH Pin is set at “L” Level, all input and output pins are disabled and the current consumption is reduced to the minimum. Under this conditions, the backup by means of a capacitor becomes possible. An example of this application when a backup capacitor is used is shown below.

PT2253A v 2.6

Page 8

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

Vcc

VDD 10K

Vcc

PT2253A

10K 1000u 16V

Vss

INH

Vss 51K

• If Vcc-Vss drops below 4.0 V, the backup becomes impossible.

DC ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vcc = 12 V, Vss = 0 V and Ta = 25 oC) PARAMETER

SYMBOL

Operating Supply Voltage Operating Supply Current Stand-by-Current

Vcc Icc ISB

Input Voltage “H” Level (INH,U/D) “L” Level Attenuator 1 (10dB/step) Resistor

VIH VIL RATT-1

Attenuator 2 (2dB/step) Resistor

RATT-2

Max. Input Amplitude

Vin

Operating Oscillation Frequency DCO Output Current

fosc

PT2253A v 2.6

IDCO

CONDITION

Vcc=12V INH=0V OSC=12V

Attenuation Level is set to 0dB Attenuation Level is set to 0dB Bias Vcc/2 = 6V Fin=1KHz ATT=0dB

1 Step

Page 9

MIN.

TYP.

MAX.

6 -

1 -

12 3 10

0.8 x Vcc Vss - 0.3 25

50

Vcc + 0.3 0.2 x Vcc 70



10

20

28



-

-

4.0

Vrms

5

-

10k

Hz

70

100

140

uA

Revised October 1999

UNI T V mA uA

V

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vcc = 6V, Vss = -6V, GND = 0V)

IN1 ~ OUT1 Characteristic Signal to Noise Ratio

Symbol S/N

Frequency Response

Fr

Noise Floor

NF

Total Harmonic Distortion

THD

Condition ATT=0dB Fin=1KHz Vin=1.0Vrms ATT=-10dB Fin=1KHz Vin=1.0Vp-p Vin=0V, ATT=0dB ATT=-10dB Fin=1KHz Vin=1.0Vrms

Max. 97

Unit dB

657

KHz

0.015

mv

0.010

%

IN2 ~ OUT2 Characteristic Signal to Noise Ratio

Symbol S/N

Frequency Response

Fr

Noise Floor

NF

Total Harmonic Distortion

THD

PT2253A v 2.6

Condition ATT = 0dB Fin=1KHz Vin=1.0Vrms ATT=-2dB Fin=1KHz Vin=1.0Vp-p Vin=0V ATT=0dB ATT=-2dB Fin=1KHz Vin=1.0Vrms

Page 10

Max. 95

Unit dB

1820

KHz

0.022

mv

0.009

%

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

APPLICATION CIRCUIT 1 Dual Power Supply (L-Channel Only) Vss

-6V + 4 1 LM358 _ 8 2

3 10uF

VDD

+

+6V 10uF

+

Vss

L-OUT1 R-OUT1

10uF +

INPUT GROUND

L-IN1 A-GND

10uF

L-IN2

+

OUTPUT

Vcc

R-IN1 A-GND R-IN2

L-OUT2 R-OUT2 INH

U/D

DCO

OSC

+ CX 4.7

PT2253A

10K

+ 1N4148

100K RS fosc =

RS

1 (0.7)(CX)( RX)

Page 11

33K RX 1N4148

3RX UP SW

PT2253A v 2.6

1uF

DOWN SW

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

APPLICATION CIRCUIT 2 Dual Power Supply (L-Channel Only) Vss

-6V 4 3 10uF

LM358

+

1

8

2

68pF VDD

+6V 10uF

0.15uF

+

51K Vss

10uF

L-OUT1 R-OUT1

+

INPUT GROUND

L-IN1 A-GND

10uF

L-IN2

+

OUTPUT

110K

Vcc

R-IN1 A-GND R-IN2

L-OUT2 R-OUT2 INH

U/D

DCO

OSC

CX 4.7

PT2253A

10K

1N4148

100K RS fosc =

RS

1 (0.7)(CX)( RX)

1uF

33K RX 1N4148

3RX UP SW

DOWN SW

Note: Since the Buffer Amp between Att-1 and Att-2 is already 10dB Voltage Gain, higher input level may cause OP Amp’s Output Clipping. To avoid unwanted distortion, the input signal level applied at IN-1 should not be over 1 Vrms.

PT2253A v 2.6

Page 12

Revised October 1999

Page 13

Vcc

Output (Left Channel)

Input (Left Channel)

10K

10K

Vcc

2

8 1 + - LM358 4

+ 100uf

C3

C1

10uf

+

10uf

+

Vcc

R-IN2

OSC

DCO

PT2253A

U/D

INH

R-OUT2

L-IN2 L-OUT2

A-GND

R-IN1

R-OUT1

A-GND

L-IN1

L-OUT1

Vss

Vcc

10uf C2

0.1uf

Up Key

100K

10uf C4

4.7uf +

+

PT2253A v 2.6 +

3

2

2

IN4148 1 2

33K

IN4148

2

2

2

1

6

5

+ 1uf

8 7 + - LM358 4

Vcc (6 ~ 12V)

Output (Right Channel)

Input (Right Channel)

ANGUS ELECTRONICS COMPANY LIMITED

Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC PT2253A

APPLICATION CIRCUIT 3

Single Power Supply

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

APPLICATION CIRCUIT 4

Output (Right Channel)

110K

68pF

7

2

2

2

2

2

1 Up Key

10uf

Vcc OSC DCO

C3

+

PT2253A

U/D INH

R-IN2

R-OUT2 L-OUT2

L-IN2

10uf

A-GND

R-IN1 L-IN1 10uf

+ 100uf

68pF

110K

10K

Vcc

Output (Left Channel)

Input (Left Channel)

51K

0.15uf

10K

Vcc

8 3 + 2 - LM358 4

1

C1

+

Vcc

R-OUT1 L-OUT1

Vss

+ A-GND

0.1uf

+

100K

+ 4.7uf

C4

C2

10uf

33K

IN4148

1

0.15uf 51K

IN4148

+

1uf

8 5 + 6 LM358 4

Vcc (6 ~ 12V)

Input (Right Channel)

Single Power Supply

Note: Since the Buffer Amp between Att-1 and Att-2 is already 10dB Voltage Gain, higher input level may cause OP Amp’s Output Clipping. To avoid unwanted distortion, the input signal level applied at IN-1 should not be over 1 Vrms. PT2253A v 2.6

Page 14

Revised October 1999

ANGUS ELECTRONICS COMPANY LIMITED Princeton Technology Corp.Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk

Electronic Volume Controller IC

PT2253A

ORDER INFORMATION Valid Part Number PT2253A

Package Type 16 Pins, DIP

PACKAGE INFORMATION 16 Pins, DIP Package

PT2253A v 2.6

Symbol

Dimension in Mil

A

750

B

65

C

55

Page 15

Revised October 1999