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PDF PT2256 Data sheet ( Hoja de datos )
| Número de pieza | PT2256 | |
| Descripción | Electronic Volume Controller IC | |
| Fabricantes | Princeton Technology Corp | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PT2256 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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Electronic Volume Controller IC
Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
www.DataSheet4U.com
PT2256
DESCRIPTION
PT2256 is an electronic volume controller IC utilizing CMOS Technology specially designed for use on
audio equipment. It has 2 built-in channels making it ideally suitable for mono and stereo sound
applications. PT2256 provides the Loudness Function, a wide frequency response range and a very
low total harmonic distortion, thereby guaranteeing a highly effective and reliable performance. It is
housed in 16-pin DIP or SOP package and is functionally compatible with TC9235P. Pin assignments
and application circuit are optimized for low cost advantages and easy PCB Layout.
FEATURES
• CMOS technology
• Low power consumption
• Least external components
• 2 channels in the same chip
• 0dB to -78dB attenuation can be controlled by up and down pin
• 20dB tap for loudness circuit
• Built-in DC output circuit (8 levels) for volume level metering
• Wide frequency response range
• Low total harmonic distortion
• Available in 16 pins DIP or SOP
APPLICATION
• Audio equipment volume control
PT2256 V1.7
-1-
August, 2006
1 page  
Electronic Volume Controller IC
Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
www.DataSheet4U.com
PT2256
FUNCTION DESCRIPTION
ATTENUATION
The PT2256 volume control circuit consists of ladder resistors and analog switches. The Tap for
loudness function is connected to the Step 10 (-20dB). When the (3.9KΩ) resistor is connected
between LT and AGND pins, the attenuation is given in table below.
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Attenuation
(dB)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
Step
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Attenuation
(dB)
-32
-34
-36
-38
-40
-42
-46
-50
-54
-58
-62
-66
-70
-74
-78
∞
The equivalent circuit is shown below:
OUT
IN
Step 0
Step 1
2 9 KΩ
Step 2
LT
2 2 KΩ
Step 9
Step 10
Step 11
AGND
Step 30
Step 31
Note: Step 22 has an initial value of -46dB.
PT2256 V1.7
-5-
August, 2006
5 Page 
Electronic Volume Controller IC
Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
www.DataSheet4U.com
PT2256
APPLICATION CIRCUIT
SINGLE POWER SUPPLY (NO LOUDNESS AND NO BACKUP CIRCUIT)
VDD (4.5 to 12V)
L-Ch Output
L-Ch Input
10µF
10µF
+
+
3.9K
UP Key
Down Key
Rx
+
Cx
VSS
OUT1
IN1
LT1
AGND
/UP
/DN
OSC
VDD
OUT2
IN2
LT2
AGND
DCO
/INH
/RST
PT2256
0.1µF
3.9K
10µF
10µF
100K
0.1µF
R-Ch Output
R-Ch Input
10K
+
10K 100µF
Note:
Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is big,
then the volume control change is fast. Likewise, if the Fosc value is small, the volume control change
is slow. It is suggested that Rx=33K, Cx=2.2µF.
The table for the Rx, Cx and Fosc values are given below:
Rx Cx Fosc
33K 1.0µF 34.1Hz
33K 2.2µF 17.8Hz
33K
10µF
3.4Hz
Rx
33K
51K
100K
Cx
1.0µF
1.0µF
1.0µF
Fosc
34.1Hz
22.7Hz
11.8Hz
PT2256 V1.7
- 11 -
August, 2006
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet PT2256.PDF ] | |
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