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LM4854MT Datasheet

  • LM4854MT

  • AUDIO AMPLIFIER|DUAL|TSSOP|14PIN|PLASTIC

  • 25頁

  • ETC

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LM4854 1.9W Monaural, 85mW Stereo Headphone Audio Amplifier
May 2002
LM4854
1.9W Monaural, 85mW Stereo Headphone Audio
Amplifier
General Description
The unity-gain stable LM4854 is both a mono differential
output (for bridge-tied loads, or BTL) audio power amplifier
and a single-ended (SE) stereo headphone amplifier. Oper-
ating on a single 5V supply, the mono BTL mode delivers
1.1W (typ) to an 8鈩?load, 1.7W (typ) to a 4鈩?load (Note 1) at
1% THD+N. In SE stereo mode, the amplifier will deliver
85mW to 32鈩?loads. The LM4854 features a new circuit
topology that suppresses output transients (鈥檆lick and pops鈥?
and eliminates SE-mode output coupling capacitors, saving
both component and board space costs. The LM4854 has
three inputs: one pair for a two-channel stereo signal and the
third for a single-channel mono input.
The LM4854 is designed for PDA, cellular telephone, note-
book, and other handheld portable applications. It delivers
high quality output power from a surface-mount package and
requires few external components. Other features include an
active-low micropower shutdown mode, an 鈥檌nstant-on鈥?low
power standby mode, and thermal shutdown protection.
The LM4854 is available in the very space-efficient 12-lead
micro SMD, exposed-DAP LLP for higher power applica-
tions, and TSSOP packages. (Contact NSC鈥檚 Audio Market-
ing for availability of the TSSOP packaged part.)
Note 1:
An LM4854LD that has been properly mounted to a circuit board will
deliver 1.7W (typ) into a 4鈩?load.
j
SE output power (R
L
= 32鈩?and THD+N
= 1.0%)
V
DD
= 3.0V
V
DD
= 5.0V
j
Micropower shutdown supply current
32mW (typ)
93mW (typ)
0.005碌A(chǔ) (typ)
0.05碌A(chǔ) (typ)
16碌A(chǔ) (typ)
27碌A(chǔ) (typ)
V
DD
= 3.0V
V
DD
= 5.0V
j
Standby supply current
V
DD
= 3.0V
V
DD
= 5.0V
j
PSRR (f = 1kHz, 3.0V
鈮?/div>
V
DD
鈮?/div>
5.0V,
(Fig. 1))
BTL
SE
60dB (typ)
66dB (typ)
Features
n
Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off
time
n
Eliminates SE amplifier output coupling capacitors
n
Advanced 鈥檆lick and pop鈥?suppression circuitry
n
Stereo headphone amplifier mode
n
Low-power standby and ultra-low current micropower
shutdown modes
n
Thermal shutdown protection circuitry
n
2.4V to 5.5V operation
n
Unity-gain stable
n
Gain set with external resistors
n
Space-saving micro SMD package, exposed-DAP LLP,
and TSSOP (Contact NSC鈥檚 Audio Marketing for
availability of the TSSOP packaged part)
Key Specifications
j
LLP BTL output power (R
L
= 3.2鈩?and
THD+N = 1%)
V
DD
= 3.0V
V
DD
= 5.0V
j
LLP BTL output power (R
L
= 4鈩?and
1.0W (typ)
1.9W (typ)
THD+N = 1%)
V
DD
= 3.0V
V
DD
= 5.0V
j
LLP BTL output power (R
L
= 8鈩?and
900mW (typ)
1.7W (typ)
Applications
n
n
n
n
PDAs
Notebook computers
Cellular phones
Handheld portable electronic devices
THD+N = 1%)
V
DD
= 3.0V
V
DD
= 5.0V
380mW (typ)
1.1W (typ)
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200382
www.national.com

LM4854MT相關(guān)型號(hào)PDF文件下載

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