PT2812 [PTC]
3W Stereo Class-D Amplifier with 3 Inputs and Volume;
| 型号： | PT2812 |
| 厂家： | 
PRINCETON TECHNOLOGY CORP |
| 描述： | 3W Stereo Class-D Amplifier with 3 Inputs and Volume |
| 文件： | 总5页 (文件大小：210K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT2812
3W Stereo Class-D Amplifier with
3 Inputs and Volume
DESCRIPTION
FEATURES
The PT2812 is an integrated 3W stereo Class-D
amplifier with audio processor. The input selector
supports 2 Single-Ended and 1 Fully-Differential input
can be chose. The highly integration of the audio
processor and class-D amplifier can further reduce
external components BOM and provides better audio
experience. All of functions are controlled via I2C bus.
Supply Voltage: 3~6V
3W X 2 Class-D power amplifier (VDD=5V, RL=4Ω)
1 Fully-Differential input
2 Single-Ended audio inputs
Programmable input gain from 0 to +15dB
Master volume in 1dB/step from 0 to -79dB
Advanced soft-mute and multiple soft-step volume
technology eliminate audible click during volume and
input sources changing.
APPLICATIONS
Built-in RF noise filter
PC/Video Projector
Portable media player
Audio duck system
Shutdown function for power saving
Over temperature and over current protection
Controlled by I2C interface
Flat panel display with audio inputs
Available in 32 Pins, 4x4 mm QFN package
BLOCK DIAGRAM
LON
LGND
LVDD
LOP
ROP
RVDD
RGND
RON
LINP
RINP
RINN
LCH CLASS-D
(+20/+26 dB)
RCH CLASS-D
(+20/+26 dB)
OSC Generator
LINN
SD
OE
VDD
Digital
Interface
Logic
Control
SDA
SCL
Power
Management
Bypass
GND
LOUT
ROUT
Volume
(0~-79dB)
Volume
(0~-79dB)
Protection Circuitry
INPUT
Gain
INPUT
Gain
Fully-Differential
input
INPUT
Multiplexer
INPUT
Multiplexer
L2
L1
DIFFL- DIFFR- DIFFR+
R1
R2
DIFFL+
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
PT2812
3W Stereo Class-D Amplifier with
Audio Processor
APPLICATION CIRCUIT
P1
L1
L2
FB
FB
+5V
C14
10u
1uF
C10
C15
100u
P2
HOST MCU
C12 1uF
GND
C16 10uF
L3
FB
C1
C2
1u
1u
1u
1u
1u
1u
1u
1u
25
26
27
28
29
30
31
32
16
15
14
13
12
11
10
9
R2
RON
RGND
RVDD
ROP
U1
R1
Tuner
C3
C4
C5
C6
C7
C8
C17 1uF
C18 1uF
RSPK
DIFFR+
DIFFR-
DIFFL-
DIFFL+
L1
L4
L5
FB
FB
BT
PT2812
LOP
LVDD
LGND
LON
U2
AUX
LSPK
L2
L6
FB
Lowpass Filter (option)
C9
2.2u
1u
C13
1uF
C21
C11 1uF
V1.0
2
August 2013
PT2812
3W Stereo Class-D Amplifier with
Audio Processor
ORDER INFORMATION
Valid Part Number
Package Type
Top Code
PT2812-QFN
32 Pins, QFP, 4 X 4 mm
PT2812-QFN
PIN CONFIGURATION
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1
RINN
RINP
VDD1
VDD2
SD
LINN
LINP
GND1
GND2
OE
PT2812-QFN
SDA
BYPASS
NC
SCL
ROUT
LOUT
V1.0
3
August 2013
PT2812
3W Stereo Class-D Amplifier with
Audio Processor
PIN DESCRIPTION
Pin Name
LOUT
NC
I/O
O
-
Description
Pin No.
1
Left channel line out
No connection
2
BYPASS
OE
GND1
GND2
LINP
LINN
LON
LGND
LVDD
LOP
P
I
P
P
I
Bypass cap for Internal Voltage Reference, a 2.2µF cap is recommended.
Output Enable setting, connect a 0.22F cap to GND.
Ground for internal circuits
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Ground for internal circuits
Positive input of left channel Class-D amp
Negative input of left channel Class-D amp
Negative output of left channel Class-D amp
Power ground of left channel Class-D amp
Power input of left channel Class-D amp
Positive output of left channel Class-D amp
Positive output of right channel Class-D amp
Power input of right channel Class-D amp
Power ground of right channel Class-D amp
Negative output of right channel Class-D amp
Negative input of right channel Class-D amp
Positive input of right channel Class-D amp
Power input for internal circuits
I
O
P
P
O
O
P
P
O
I
ROP
RVDD
RGND
RON
RINN
RINP
VDD1
VDD2
I
P
P
Power input for internal circuits
Shutdown. Sets to low level will turn off whole chip and pull up to High level is back to
normal operation.
SD
I
21
SDA
SCL
ROUT
R2
I
I
O
I
I
I
I
I
I
I
I2C bus data input
22
23
24
25
26
27
28
29
30
31
32
I2C bus clock input
Right channel line out
Input 2 of right channel
Input 1 of right channel
Differential right channel “+” input
Differential right channel “-” input
Differential left channel “-“ input
Differential left channel “+” input
Input 1 of left channel
R1
DIFFR+
DIFFR-
DIFFL-
DIFFL+
L1
L2
I
Input 2 of left channel
V1.0
4
August 2013
PT2812
3W Stereo Class-D Amplifier with
Audio Processor
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian Dist., New Taipei City 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
V1.0
17
August 2013
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