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PDF PT2257-S Data sheet ( Hoja de datos )
| Número de pieza | PT2257-S | |
| Descripción | Electronic Volume Controller IC | |
| Fabricantes | Princeton Technology Corp | |
| Logotipo |  |
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Electronic Volume Controller IC
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2257
DESCRIPTION
PT2257 is an Electronic Volume Controller IC utilizing CMOS Technology specially designed for the
new generation of AV entertainment products. It has two (2) built-in channels making it ideally suitable
for mono and stereo sound applications. PT2257 provides an I2C Control Interface, an attenuation
range of 0 to -79dB, low noise, and high channel separation. It is housed in an 8 pins, DIP or SOP
Package, PT2257’s pin assignments and application circuit are optimized for easy PCB layout and cost
saving advantages.
FEATURES
• CMOS Technology
• Low Power Consumption
• Least External Components
• Attenuation Range: 0 to -79dB at 1dB/step
• Operating Voltage: 4 to 9V
• Low Noise, S/N Ratio>100dB (A-weighting)
• Two Channel Output
• Available in 8 pins, DIP or SOP
APPLICATIONS
• AV Surround Audio Equipment
• Car Audio
• Mini Compo
• Computer Multi-Media Speaker
• Other Audio Equipment
PT2257 V1.3
- 1 - December, 2006
1 page  
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2257
BYTE FORMAT
Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an
Acknowledge Bit. The MSB is transmitted first.
ACKNOWLEDGE
During the Acknowledge Clock Pulse, the master (µP) puts a resistive HIGH level on the SDA Line.
The peripheral (audio processor) that acknowledges has to pull-down (LOW) the SDA line during the
Acknowledge Clock Pulse so that the SDA Line is in a Stable Low State during this Clock Pulse. Please
refer to the diagram below.
SC L
12 34
78 9
SD A
Start
MSB
A cknowledgment
from R eceiver
The audio processor that has been addressed has to generate an Acknowledge after receiving each
byte; otherwise, the SDA Line will remain at the High Level during the ninth (9th) Clock Pulse. In this
case, the master transmitter can generate the STOP Information in order to abort the transfer.
TRANSMISSION WITHOUT ACKNOWLEDGE
If you want to avoid the acknowledge detection of the audio processor, a simpler µP transmission may
be used. Wait one clock and do not check the slave acknowledge of this same clock then send the new
data. If you use this approach, there are greater chances of faulty operation as well as decrease in
noise immunity.
PT2257 V1.3
- 5 - December, 2006
5 Page 
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Electronic Volume Controller IC
PT2257
PT2257 THD - FAST FOURIER TRANSFORM (FFT) ANALYSIS 1
(Conditions: Rload=10K, Volume Att=0dB, VCC=9V, Output Level=1Vrms)
+0
-20
-40
dB -60
-80
-100
-120
-140
-160
20
50 100 200
500
Hz
1k
2k
5k 10k
PT2257 THD - FAST FOURIER TRANSFORM (FFT) ANALYSIS 2
(Conditions: Rload=10K, Volume Att=0dB, VCC=9V, Output Level=200m Vrms)
+0
-20
-40
dB -60
-80
-100
-120
-140
-160
20
50 100 200
500
Hz
1k
2k
5k 10k
PT2257 V1.3
- 11 -
December, 2006
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet PT2257-S.PDF ] | |
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