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PDF PAM8908 Data sheet ( Hoja de datos )
| Número de pieza | PAM8908 | |
| Descripción | 25-mW TrueCapFree Stereo Headphone Amplifier | |
| Fabricantes | PAM | |
| Logotipo |  |
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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
1 page  
PAM8908
25-mW TrueCapFree Stereo Headphone Amplifier
Electrical Characteristic
TA=25°C,PVDD=3.6V, RL=16Ω(unless otherwise noted)
Paramete r
Symbol Test Condition
Min Typ Max Unit
Supply Voltage
PVDD
2.5 5.5 V
Quiescent Current
Output Power per Channel
IQ EN=PVDD, No load
THD=1%, f=1kHz, RL=16Ω
PO THD=1%, f=1kHz, RL=32Ω
4 mA
35
mW
25
Shutdown Curr ent
Isd EN=0V, PVDD=2.5V to 5.5V
0.1 1 uA
EN High level input voltage
VIH
1.4 V
EN Low level input voltage
VIL
0.6 V
G0,G1 High level input voltage
VGH
1.4 V
G0,G1 Low level input voltage
VGL
0.6 V
Output Offset voltage
Vos
1 3 mV
G0=0V, G1=0V
-6 dB
Closed-loop voltage gain
G0=PVDD,G1=0V
AV
G0=0V,G1=PVDD
0 dB
3 dB
G0=PVDD,G1=PVDD
6 dB
Power supply rejection ratio
PSRR Input AC-GND, f=1KHz, Vpp=200mV
75
dB
Total Harmonic distortion plus noise THD+N Po=20mW,f=1kHz
Signal to noise ratio
SNR Po=20mW into 16Ω
0.03 %
100 dB
Noise output voltage
En A-weighted
10 uVrms
Corsstalk
CS Po=15mW,f=1kHz
80 dB
Chargepump switching frequency
Fosc
1.2 1.5 1.8 MHz
start-up time
Ton EN from low to high
0.4 mS
Thermal shutdown
OTP Threshold
150 °C
Thermal shutdown Hyster esis
OTPH Hysteresis
20 °C
Power Analog Microelectronics, Inc
www.poweranalog.com
5
05/2011 Rev1.0
5 Page 
PAM8908
25-mW TrueCapFree Stereo Headphone Amplifier
Ordering Information
PAM8908 X X X
Shipping Package
Pin Assignment
Package Type
Part Num ber
PAM8908JER
Package Type
TQFN3X3-16L
Shipping Package
3,000 Units/ Tape & Reel
Power Analog Microelectronics, Inc
www.poweranalog.com
11
05/2011 Rev1.0
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PAM8908.PDF ] | |
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