Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
1 Watt Audio Power Amplifier
PT2301
DESCRIPTION
The PT2301 is an integration audio power amplifier IC utilizing advanced CMOS technology.
Supports 2 mono MIC input and 2 stereo line input, input gain of each amp can be set individually to
meet customers’ needs. Built-in digital controlled volumes have 49 steps from +15dB ~ -90dB and all
the functions can be controlled via I
2
C bus. In the output section, the PT2301 is equipped with both
stereo headphone driver and mono speaker amp maximum output up to 1 watt.
The PT2301 also equipped “Energy Save” power management systems; user can turn off the unused
portion to minimize total power consumption for extended battery endurance. For different applications,
the headphone section of the PT2301 has two mode types for different purposes, A-type (Output
Capacitor-less) or B-type (Output with Capacitor).
FEATURES
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1W (8
Ω)
mono channel speaker driver + stereo headphone driver
Digital controlled volume (49 steps /+15dB ~ -90dB)
2 mono microphone inputs, 1 microphone output
2 stereo line input
Input gain can be setting individually in each input port.
Eliminate DC block capacitor in the headphone driver output (Only PT2301-A supported)
Standby mode and Mute function
Thermal shutdown protection circuit
Energy Save function
Very low “POP” noise during function changed.
Wide operation voltage range: 2.7V ~ 5.5V
Low Distortion: earphone output < 0.05%, speaker output< 0.04%
Available in 24 Pin, space saving TSSOP Package
APPLICATIONS
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Electronic dictionary
Translator
PDA
DSC (Digital Still Camera)
GPS
PT2301 V1.4
-1-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
1 Watt Audio Power Amplifier
PT2301
APPLICATION CIRCUIT I (PT2301-A)
VCC
4.7K
4.7K
External
MIC IN
Microphone Jack
C8 1uF
Internal MIC IN
C2 1uF
MIC OUT
C7 1uF
L1L
C6 1uF
L2L
RL2 24K
RL1 24K
1
2
3
4
SCL
VCC
SDA
5
6
7
100uF
C4 1uF
L2R
C5 1uF
L1R
RR1 24K
Cb
1uF
RR2 24K
8
9
L1L
L2L
MIC1
VSS2
SCL
SDA
VCC
MICOUT
MIC2
MIC_SENSE
HP_SENSE
LOUT
VP1
SP+
VEE
24
23
22
21
20
19
18
17
16
15
14
13
/SHUTDOWN
MUTE
100uF
VCC
C3
100uF
8 ohm
VCC
Headphone Jack
R4 10K
C9 1uF
R3 10K
Cb1
10uF
PT2301-A
SP-
VP2
ROUT
VSS1
10 L2R
11 L1R
12 REF
/SHUTDOWN
MUTE
Notes
1. The (+) polarity of DC block capacitor installed in the I/O pin of the PT2301 should face towards the
higher potential.
2. HP_SENSE (Pin 23) must be connected to Pin22 LOUT.
3. The gain setting resistors (R3、R4、RL1、RL2、RR1、RR2 ) should keep as close as possible with
the PT2301 chip to prevent pick up noises.
4. DO NOT CONNECT HEADPHONE COMMON (VEE) TO OTHER AUDIO EQUIPMENT! THIS
MAY CAUSES IC DAMAGE.
PT2301 V1.4
-3-
April, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
1 Watt Audio Power Amplifier
PT2301
APPLICATION CIRCUIT II (PT2301-B)
VCC
4.7K
4.7K
External
MIC IN
Microphone Jack
C8 1uF
Internal MIC IN
C2 1uF
MIC OUT
C7 1uF
L1L
C6 1uF
L2L
RL2 24K
RL1 24K
1
2
3
4
SCL
VCC
SDA
5
6
7
100uF
C4 1uF
L2R
C5 1uF
L1R
RR1 24K
Cb
1uF
RR2 24K
8
9
L1L
L2L
MIC1
VSS2
SCL
SDA
VCC
MICOUT
MIC2
MIC_SENSE
HP_SENSE
LOUT
VP1
SP+
NC
24
23
22
21
20
19
18
17
16
15
14
13
/SHUTDOWN
MUTE
100uF
VCC
C3
100uF
8 ohm
C12
300uF
VCC
Headphone Jack
R4 10K
R7
10K
C11
300uF
C9 1uF
R3 10K
VCC
R8
10K
R10 1K
R9 1K
Cb1
10uF
PT2301-B
SP-
VP2
ROUT
VSS1
10 L2R
11 L1R
12 REF
/SHUTDOWN
MUTE
Notes
1. The (+) polarity of DC block capacitor installed in the I/O pin of the PT2301 should face towards the
higher potential.
2. The gain setting resistors (R3、R4、RL1、RL2、RR1、RR2 ) should be kept as close as possible
with the PT2301 chip to prevent pick up noises.
PT2301 V1.4
-4-
April, 2006
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