PT2334
Stereo 2W Class-D Amplifier with Built-In
Audio Processor
DESCRIPTION
The PT2334 is an integrated stereo 2W Class-D
amplifier accompany with a Class-AB headphone
driver. The input interface accepts both analog and
digital audio sources; the chip included a 16-bit DAC to
convert digital audio source to analog signal. The
signal process is basically in analog domain to
maintain the high performances and low power
consumption. The PT2334 also provide very useful
multi-sources selection (Up to 4 sources) and tone
control functions, thanks for the advanced CMOS
technology now we could combine both audio
processing and amplification into a single chip. The
whole chip functions are controlled via I
2
C bus.
FEATURES
•
Supply Voltage: 3.7~6V
•
Differential input power amplifier for improved
CMRR.
•
2W X 2 Class-D power amplifier (VDD=5V,
RL=4Ω)
•
70mW X 2 Class-AB headphone driver (RL=32Ω)
•
BASS and TREBLE control
•
32 steps volume controller
•
4 Inputs selection
•
Audio line out (same level with volume and tone)
•
Built-In 16 bits DAC for digital audio sources
•
Pop-Free circuitry eliminates unpleasant noises
during power ON/OFF.
•
Low power shutdown
•
Over Heat/Over current protection circuitry
•
Controlled by I
2
C interface
•
High Power CMOS processing
•
Available in 48 Pins, LQFP
APPLICATIONS
•
•
•
•
•
Flat panel display and TV
Portable media player
Portable player ducking system
Digital photo frame
Other audio applications
BLOCK DIAGRAM
DACRO
R1
R2
R3
R4
RT
RB2
RB1
ROUT
HVDD
RHPO
RINP
RINN
SDI
LRCI
BCKI
SDI
LRCI
BCKI
TREBLE
RCH
BASS
RCH
HPR
R1
R2
R3
16-Bit
DAC
Vref
R-VOL
R4
RCH 2W
Bypass
VDDA
GNDA
SD
OE
SDA
SCL
RVDD
RGND
ROP
RON
SPR
CLASS-D
BYPASS
AVDD
AGND
SD
OE
SDA
SCL
HPEN
Pow er
Management
Vref
LCH 2W
Vref
LGND
LVDD
LON
LOP
SPL
CLASS-D
L-VOL
HPL
Control
Interface
L1
L2
HPEN
L3
DACLO
L1
L2
L3
L4
TREBLE
LCH
BASS
LCH
L4
LT
LB2
LB1
LOUT
HGND
LHPO
LINP
LINN
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan