Princeton Technology Corp
.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2253B
PT2253B v 1.7
Page 1 Revised October 1999
DESCRIPTION
PT2253B is an electronic volume controller IC utilizing CMOS Technology
specially designed for use on audio equipment. It has two (2) built-in channels
making it ideally suitable for mono and stereo sound applications. PT2253B
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 = 4 ~ 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 pins, DIP or SO Package
APPLICATIONS
!
Audio Equipment Volume Control
!
Traditional VR Replacement
Princeton Technology Corp
.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2253B
PT2253B v 1.7
Page 2 Revised October 1999
PIN CONFIGURATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V ss
L -O U T 1
L -IN 1
A -G N D
L -IN 2
L -O U T 2
IN H
D C O
V c c
R -O U T 1
R -IN 1
A -G N D
R -IN 2
R -O U T 2
U /D
O S C
P T 2 2 5 3 B
ORDER INFORMATION
Note: PTC also offers PT2253A for an Operating Voltage Range = 6.0 ~12.0 V.
Valid Part Number
Package
PT2253B
16 Pins, DIP
PT2253B-SN
16 Pins, SO (150 mil)
Princeton Technology Corp
.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2253B
PT2253B v 1.7
Page 3 Revised October 1999
APPLICATION CIRCUIT 1
Dual Power Supply (L-Channel Only)
V ss
L -O U T 1
L -IN 1
A -G N D
L -IN 2
L -O U T 2
IN H
D C O
V c c
R -O U T 1
R -IN 1
A -G N D
R -IN 2
R -O U T 2
U /D
O S C
P T 2 2 5 3 B
10uF
+
10uF
+
+
4.7
CX
100K
RS
33K
RX
IN4148
+
1uF
IN4148
DOWN
SW
UP
SW
INPUT
GROUND
OUTPUT
LM358
+
_
10uF
Vss -6V
10K
10uF
VDD +6V
3
2
8
1
4
fosc = 1
(0.7)(CX)( RX)
RS 3RX
+
+
Princeton Technology Corp
.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2253B
PT2253B v 1.7
Page 4 Revised October 1999
APPLICATION CIRCUIT 2
Dual Power Supply (L-Channel Only)
V ss
L -O U T 1
L -IN 1
A -G N D
L -IN 2
L -O U T 2
IN H
D C O
V c c
R -O U T 1
R -IN 1
A -G N D
R -IN 2
R -O U T 2
U /D
O S C
P T 2 2 5 3 B
10uF
+
10uF +
+
4.7
CX
100K
RS
33K
RX
IN4148
+
1uF
IN4148
DOWN
SW
UP
SW
INPUT
GROUND
OUTPUT
LM358
+
_
10uF
Vss -6V
10K
10uF
VDD +6V
3
0.15uF
51K
68pF
110K
2
8
1
4
fosc = 1
(0.7)(CX)( RX)
RS 3RX
+
+
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.
Princeton Technology Corp
.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2253B
PT2253B v 1.7
Page 5 Revised October 1999
APPLICATION CIRCUIT 3
Single Power Supply
Vs
s
L-
O
U
T
1
L-
I
N
1
A-
GN
D
L-
I
N
2
L-
O
U
T
2
IN
H
DC
O
Vc
c
R-
O
U
T
1
R-
I
N
1
A-
GN
D
R-
I
N
2
R-
O
U
T
2
U/
D
OSC
10u
f
10uf
10u
f
10uf
+
+
+
+
-
-
+
+
4
4
2
6
3
5
1
7
L
M
358
L
M
358
8
8
I
nput
(
L
ef
t
C
h
an
n
e
l
)
C1
C2
C3
C4
Ou
t
p
u
t
(
L
ef
t
C
h
an
n
e
l
)
Vc
c
+
100uf
10
K
10K
Vc
c
P
T
22
53
B
Vc
c
(
4
~
1
2
V
)
0.
1
u
f
In
p
u
t
(
R
ig
h
t
C
h
a
n
n
e
l)
O
u
t
put
(R
i
g
h
t
C
h
a
n
n
e
l
)
1
2
I
N
414
8
I
N
414
8
33
K
2
2
2
2
1
2
1u
f
+
Vc
c
+
4.
7uf
100K
Up
K
e
y
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