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PAM

PAM8908 Datasheet Preview

PAM8908 Datasheet

25-mW TrueCapFree Stereo Headphone Amplifier

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PAM8908
25-mW TrueCapFree Stereo Headphone Amplifier
Key Features
n Patent Pending 3 Phase Power Line Shift
Charge Pump Eliminates Need for DC-
Blocking Capacitors
n TrueCapFree Architecture, Output Biased at
0V (System Ground)
n Excellent Low Frequency Fidelity
n High PSRR
n Less Than 1uA Shutdown Current
n Support Both Fully Differential and Single-
Ended Inputs
n Short Circuit and Over Temperature
Protection
n Selectable Gain Settings:-6dB,0dB,3dB and
6dB
n Available in Space Saving Packages:
TQFN3x3-16L
Applications
n Smart Phones/Cellular Phones
n Notebook Computers
n Portable DVD Player
n Personal Digital Assistants (PDAs )
n Electronic Dictionaries
n Digital Still Cameras
n Potable Gaming
Typical Application Circuit
General Description
The PAM8908 stereo headphone driver is
designed for portable equipment where board
space is at a premium. The PAM8908 uses a
unique, patent pending architecture to produce a
ground-refer enced output from a single supply,
eliminating the need for large DC-blocking
capacitors, saving cost, board space, and
component height.
The PAM8908 delivers up to 25mW per channel
into a 16Ω load and has low 0.03% THD+N. A high
power-supply rejection ratio allows this device to
operate from noisy digital supplies without an
additional linear regulator.
The PAM8908 operates from a single supply from
2.5V to 5.5V, has short-circuit and over
temperature protection. Shutdown mode reduces
supply current to less than 1uA.
Typical Application Configuration with Differential Input Signals
OUTR+
Audio OUTR-
Source
OUTL+
OUTL-
1uF
1uF
1uF
1uF
ENABLE
G0
G1
INR+
INR-
OUTR
INL+
OUTL
INL-
PAM8908
EN
G0 SGND
G1 PGND
VBAR
2.2uF
PVDD
HPVDD
CAP+
1uF
HPVSS
CAP-
1uF
1uF
Power Analog Microelectronics, Inc
www.poweranalog.com
1
05/2011 Rev1.0




PAM

PAM8908 Datasheet Preview

PAM8908 Datasheet

25-mW TrueCapFree Stereo Headphone Amplifier

No Preview Available !

PAM8908
25-mW TrueCapFree Stereo Headphone Amplifier
Typical Application Circuit
Typical Application Configuration with Single-Ended Input Signal
RIGHT IN
Audio
Source
LEFT IN
ENABLE
G0
G1
VBAT
2.2uF
1uF INR-
1uF INR+
OUTR
1uF INL-
1uF
INL+
OUTL
EN PAM8908
G0 SGND
G1 PGND
PVDD
HPVDD
CAP+
1uF
HPVSS
CAP-
1uF
1uF
Block Diagram
PVDD
INL-
INL+
INR -
INR +
G0
G1
Resistor
Array
HPVDD
-
+
HPVSS
Supply
Control
Short -Circuit
Protection
PGND
OUTL
Resistor
Array
HPVDD
-
+
HPVSS
Gain
Select
On/Off
Pop Free
Thermal
Protection
PVDD
3 Phase
Charge Pump
*Patent Pending
OUTR
CAP+
1uF
CAP-
SGND EN
HPVSS
1uF
HPVDD
1uF
Power Analog Microelectronics, Inc
www.poweranalog.com
2
05/2011 Rev1.0


Part Number PAM8908
Description 25-mW TrueCapFree Stereo Headphone Amplifier
Maker PAM
Total Page 12 Pages
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