UNISONIC TECHNOLOGIES CO., LTD
PA2308
LINEAR INTEGRATED CIRCUIT
CLASS AB STEREO
HEADPHONE DRIVER

DESCRIPTION
As operating on a single 5V supply, the UTC PA2308 is
capable of delivering 280mW of max. Output power to an 8Ωload
or 110mW to a 32Ωload with less than 10% (THD+N).
The device is very sutible for portable digital audio application.

SOP-8
FEATURES
* Output power less than 10% THD+N, VDD=5V(TYP)
--280mW/CH (typical) into a 8Ω load
--110mW/CH (typical) into a 32Ω load
*Very High signal-to-noise ratio
*Large output voltage swing
*Good power supply ripple rejection
*Low power consumption and Low distortion
*Fix wide temperature range
*Without switch ON/OFF clicks

ORDERING INFORMATION
Ordering Number
PA2308G-S08-R

Package
SOP-8
Packing
Tape Reel
MARKING
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PA2308

PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8

PIN NAME
VOUT A
Inverting Input A
Non- Inverting Input A
VSS
Non- Inverting Input B
Inverting Input B
VOUT B
VDD
I/O
O
I
I
I
I
O
I
PIN DESCRIPTION
Channel A output pin
Inverting input for channel A
Non-inverting input for channel A
Ground
Non-inverting input for channel B
Inverting input for channel B
Channel B output pin
Supply voltage input pin
BLOCK DIAGRAM
1
8
VDD
Inverting Inut A
2
7
VOUT B
Non-inverting Input A
3
VSS
4
- +
VOUT A
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6 Inverting Input B
+ -

LINEAR INTEGRATED CIRCUIT
5 Non-inverting Input B
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PA2308
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VDD
7
V
Junction Temperature
TJ
150
°C
Operating Temperature
TOPR
-40 to 85
°C
Storage Temperature
TSTG
-65 to +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
SYMBOL
θJA
Junction to Ambient

MIN
TYP
210
MAX
UNIT
K/W
ELECTRICAL CHARACTERISTICS(TA=25°C; unless otherwise specified)
VDD=5V, VSS=0V, f=1kHz, RL=32Ω
PARAMETER
SUPPLY
Supply Voltage
SYMBOL
Single
Dual
Negative Supply Voltage
Supply Current
Total Power Dissipation
DC CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Common Mode Voltage
Closed Loop Voltage Gain
Max. Output Current
Output Resistance
AC CHARACTERISTICS
Output Voltage Swing
CONDITIONS
VDD
VSS
IDD
PD
VIN(OFF)
IBIAS
VCM
Gv
IOUT
Ro
VOUT
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TYP
MAX UNIT
3.0
±1.5
-1.5
5.0
±2.5
-2.5
2.5
12.5
6.0
±3.0
-3.0
5
25
No Load
No Load
5
10
0
RL=5kΩ
(THD+N)/S<0.1%
RL=32Ω(Note 1)
RL=16Ω(Note 1)
fIN=100Hz, VRIPPLE(P.P)=100mV
RL=32Ω
Power Supply Rejection Ratio
PSRR
Channel Separation
αCS
Load Capacitance
CL
Total Harmonic Distortion Plus Noise to
(THD+N)/S RL=32Ω(Note 2)
Signal Ratio
Signal to Noise Ratio
S/N
Unity Gain Frequency
FG
RL=5kΩ
Max.Output Power
POUT
(THD+N)/S<0.1%
Input Capacitance
CI
Power Bandwidth
B
Unity Gain Inverting
Notes: 1. Values are proportional to VDD;(THD+N)/S<0.1%
2. VDD=5V; VOUT(P-P)=3.5V(at 0dB)
UNISONIC TECHNOLOGIES CO., LTD
MIN
3.5
75
140
0.25
0.25
0.5
4.75
4.5
65
95
90
-65
0.05
100
5
84
3
20
200
-60
0.1
V
V
mA
mW
mV
pA
V
dB
mA
Ω
V
dB
dB
pF
dB
%
dB
MHz
mW
PF
kHz
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TYPICAL APPLICATION
220pF
2.2μF
VIN A
15kΩ
220μF
VOUT A
VDD
15kΩ
RL
8
1
2
+

LINEAR INTEGRATED CIRCUIT
VREF
1/2VDD(typ.)
100μF
3
+
-
6
5
15kΩ
VIN B
2.2μF
15kΩ
4
VOUT B
220μF
RL
220pF
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www.unisonic.com.tw
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PA2308
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
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