Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
Electronic Volume Controller IC
PT2256V
PIN CONFIGURATION
16
15
14
13
12
11
10
9
VSS
OUT1
IN1
1
2
3
4
5
6
7
8
VDD
OUT2
IN2
LT1
LT2
AGND
AGND
/UP
DCO
/INH
/RST
/DN
OSC
PT2256V
PIN DESCRIPTION
Pin Number
VSS
I/O
-
Description
Pin No.
Negative Power Supply
1
2
3
OUT1
IN1
O
I
Volume Output Pin 1
Volume Input Pin 1
LT1
AGND
O
-
Tap Output Pin 1 for Loudness Function
Analog Ground Pins 1
4
5, 12
Volume UP Control Input Pin. The
1 step/1 push volume is controlled by pressing the UP Key. If
the key has been pushed continuously increase. Built-in
Pull-up Resistor.
Volume DOWN Control Input Pin. The
1 step/1 push volume is controlled by pressing the DOWN
Key. If the key is continuously pressed, the volume control will
continuously decrease. Built-in Pull-up Resistor.
Oscillation Pin.
UP
DN
I
I
6
7
OSC
RST
I/O
I
The oscillation circuit of a resistor and capacitor connection.
Oscillator is activated when the key is pressed.
Reset Pin.
This pin sets the initial volume level. The volume level is set to
-46dB by “L” Input. Built-in Pull-up Resistor Low Active
Backup Mode Input Pin
DC Output Pin for Volume Level Meter
Tap Output Pin 2 for Loudness Function
Volume Input Pin 2
8
9
/INH
DCO
LT2
IN2
OUT2
VDD
I
O
O
I
O
-
10
11
13
14
15
16
Volume Output Pin 2
Positive Power Supply
PT2256V V1.2
- 3 -
August, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
