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LM4922 데이터시트 PDF




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부품번호 LM4922 기능
기능 80mW Stereo Headphone Amplifier
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LM4922 데이터시트, 핀배열, 회로
December 2005
LM4922
Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW
Stereo Headphone Amplifier
General Description
The LM4922 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 80mW of continuous average
power into a 16single-ended load with less than 1%
THD+N from a 3V power supply.
The LM4922 features a new circuit technology that utilizes a
charge pump to generate a negative reference voltage. This
allows the outputs to be biased about ground, thereby elimi-
www.DataSnhaetiengt4oUu.ctpoumt-coupling capacitors typically used with normal
single-ended loads.
The LM4922 features an Automatic Standby Mode circuitry
(patent pending). In the absence of an input signal, after
approximately 12 seconds, the LM4922 goes into low cur-
rent standby mode. The LM4922 recovers into full power
operating mode immediately after a signal is applied to either
the left or right input pins. This feature saves power supply
current in battery operated applications.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4922 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4922 features a low-power consumption shutdown
mode selectable for either channel separately. This is ac-
complished by driving either the SD_RC (Shutdown Right
Channel) or SD_LC (Shutdown Left Channel) (or both) pins
with logic low, depending on which channel is desired shut-
down. Additionally, the LM4922 features an internal thermal
shutdown protection mechanism.
The LM4922 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4922 has an internal fixed gain of 1.5V/V.
Key Specifications
j Improved PSRR at 217Hz
j Power Output at VDD = 3V,
RL = 16, THD % 1%
j Shutdown Current
j Internal Fixed Gain
j Operating Voltage
70dB (typ)
80mW (typ)
0.01µA (typ)
1.5V/V (typ)
1.6V to 4.2V
Features
n Fixed Logic Levels
n Ground referenced outputs
n High PSRR
n Available in space-saving micro SMD package
n Ultra low current shutdown mode
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
n Shutdown either channel independently
Applications
n Notebook PCs
n Mobile Phone
n PDAs
n Portable electronic devices
n MP3 Players
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201582
www.national.com




LM4922 pdf, 반도체, 판매, 대치품
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
4.5V
−65˚C to +150˚C
-0.3V to VDD + 0.3V
Internally Limited
2000V
200V
Junction Temperature
Thermal Resistance
θJA (typ) TLE1411A (Note 11)
Operating Ratings
Temperature Range
TMIN TA TMAX
Supply Voltage (VDD)
150˚C
86˚C/W
−40˚C TA 85˚C
1.6V VDD 4.2V
Electrical Characteristics VDD = 3V (Note 1)
The following specifications apply for VDD = 3V and 16load unless otherwise specified. Limits apply to TA = 25˚C.
Symbol
Parameter
Conditions
LM4922
Units
Typ
Limit
(Limits)
www.DataSheet4U.com
Quiescent Power Supply Current VIN = 0V, inputs terminated
Auto Standby Mode
both channels enabled
(Note 6) (Notes 7, 8)
2.3
mA
IDD
VIN = 0V, inputs terminated
Quiescent Power Supply Current both channels enabled
7 10 mA (max)
Full Power Mode
VIN = 0V, inputs terminated
one channel enabled
5
mA
ISD Shutdown Current
VOS Output Offset Voltage
AV Voltage Gain
AV Gain Match
RIN Input Resistance
VSD_LC = VSD_RC = GND
RL = 32, VIN = 0V
0.1
0.7
–1.5
1
20
1.8 µA (max)
5 mV (max)
V/V
%
15 k(min)
25 k(max)
PO
THD+N
Output Power
Total Harmonic Distortion +
Noise
THD+N = 1% (max); f = 1kHz,
RL = 16, one channel
THD+N = 1% (max); f = 1kHz,
RL = 32, one channel
THD+N = 1% (max); f = 1kHz,
RL = 16, (two channels in phase)
THD+N = 1% (max); f = 1kHz,
RL = 32, (two channels in phase)
PO = 60mW, f = 1kHz, RL = 16
single channel
PO = 50mW, f = 1kHz, RL = 32
single channel
80
65
43
50
0.04
0.03
mW
mW
38 mW (min)
45 mW (min)
%
PSRR
Power Supply Rejection Ratio
Full Power Mode
VRIPPLE = 200mVp-p, Input Referred
f = 217Hz
f = 1kHz
70
65
dB
f = 20kHz
50
SNR
Signal-to-Noise Ratio
RL = 32, POUT = 20mW,
(A-weighted)
100
dB
f = 1kHz, BW = 20Hz to 22kHz
VIH
VIL
TWU
Shutdown Input Voltage High
Shutdown Input Voltage Low
Wake Up Time From
Auto-Standby
VDD = 1.8V to 4.2V
VDD = 1.8V to 4.2V
1.2 V (min)
0.45
V (max)
5 µs
XTALK
Crosstalk
RL = 16, PO = 1.6mW,
f = 1kHz
60
dB
www.national.com
4

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LM4922 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
THD+N vs Frequency
VDD = 3V, RL = 16, PO = 50mW
THD+N vs Frequency
VDD = 3V, RL = 32, PO = 50mW
www.DataSheet4U.com
THD+N vs Frequency
VDD = 3.6V, RL = 16, PO = 100mW
20158232
THD+N vs Frequency
VDD = 3.6V, RL = 32, PO = 100mW
20158233
20158234
7
20158235
www.national.com

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