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Princeton Technology Corp.
Electronic Volume Controller IC DESCRIPTION
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
PT2253A
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
Princeton Technology Corp.
Electronic Volume Controller IC PIN CONFIGURATION
V ss L -O U T 1 L -IN 1 A -G N D L -IN 2 L -O U T 2 IN H DCO 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V cc
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
PT2253A
R -O U T 1 R -IN 1 A -G N D R -IN 2 R -O U T 2 U /D OSC
P T 2 2 53 A
ORDER INFORMATION
Valid Part Number PT2253A Package Type 16 Pins, DIP
PT2253A v 2.6
Page 2
Revised October 1999
Princeton Technology Corp.
Electronic Volume Controller IC APPLICATION CIRCUIT 1 Dual Power Supply (L-Channel Only)
Vss -6V
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
PT2253A
3 10uF
+
+ 4 1 LM358 _ 8 2
VDD
+6V 10uF
+
V ss
Vcc
10uF INPUT GROUND 10uF OUTPUT + + 10K fosc = RS 3RX
L -O U T 1 R -O U T 1 L -IN 1 A -G N D L -IN 2 R -IN 1 A -G N D R -IN 2
L -O U T 2 R -O U T 2 IN H DCO U /D
+
OSC
CX 4.7
P T 2 253A
100K RS 1 (0.7)(CX)( RX) 33K RX 1N4148 UP SW DOWN SW 1N4148
+ 1uF
PT2253A v 2.6
Page 3
Revised October 1999
Princeton Technology Corp.
Electronic Volume Controller IC APPLICATION CIRCUIT 2 Dual Power Supply (L-Channel Only)
Vss -6V
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
PT2253A
4 3 10uF
LM358
8
1
+
2
68pF VDD +6V 10uF
+
0.15uF 51K
V ss V cc
110K
10uF INPUT GROUND OUTPUT + 10uF + 10K fosc = RS 3RX
L -O U T 1 R -O U T 1 L -IN 1 A -G N D L -IN 2 R -IN 1 A -G N D R -IN 2
L -O U T 2 R -O U T 2 IN H D CO U /D O SC
CX 4.7
PT2253A
100K RS 1 (0.7)(CX)( RX) 33K RX 1N4148 UP SW
1N4148
1uF
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 4
Revised October 1999
A-GN D L -IN 2 R -IN 2 R -O U T 2 U /D OSC V cc + 4 .7 u f + C4 10uf
Princeton Technology Corp.
Page 5
A -G N D 10u f L -O U T 2 IN H V cc DCO C3 +
O u tp u t (L e ft C h a n n e l)
V cc
P T 22 53 A
10 K 100K 33K IN414 8 1 2 2 U p K ey
10K
+ 100uf
+
PT2253A v 2.6
V c c (6 ~ 1 2 V ) 3 2 0.1 u f 6 8 1 + - L M 358 4 5 8 7 + - LM 358 4 V ss L -O U T 1 10u f L -IN 1 C2 R -IN 1 C1 + 10uf In p u t (R ig h t C h a n n el) R -O U T 1 Vcc O u tp u t (R ig h t C h an n e l) 1 IN 4 1 4 8 2 2 + 1uf 2 2
Single Power Supply
APPLICATION CIRCUIT 3
Electronic Volume Controller IC
In p u t (L e ft C h a n n e l)
PT2253A
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
Revised October 1999
Princeton Technology Corp.
Electronic Volume Controller IC APPLICATION CIRCUIT 4 Single Power Supply
In put (R ight C ha nnel) O u tpu t (R ig ht C han ne l)
Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
PT2253A
V c c (6 ~ 12V )
8 7 + - L M 358 4 110 K
6 8p F
5
6
0.1 5uf 51 K
IN 4 148
+
1 uf
1
33K
IN 41 48
1
2
2
1 0uf
+ 4.7uf
C4
1 00 K
2
0 .1u f
1 0u f
V cc
R -O U T 1
R -IN 1
R -IN 2
R -O U T 2
A -G N D
U /D
OSC
L -O U T 1
L -O U T 2
A -G N D
L -IN 1
L -IN 2
10u f
10u f
C1
+
C3
+
D CO
IN H
V ss
PT 2 253A
V cc
8 1 + - L M 3 58 4 110K
68 pF
V cc
3
2
10 K
0.1 5u f
5 1K
Inp ut (L eft C han nel)
O utp ut (L e ft C h ann el)
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 6 Revised October 1999
V cc
10 K
+ 100 uf
U p K ey
C2
2
2
+
+
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