LME49610 Datasheet, PDF (10/21 Pages) National Semiconductor (TI) – High Performance, High Fidelity, High Current Audio Buffer

LME49610
SNAS435B – APRIL 2008 – REVISED APRIL 2013
www.ti.com
V+
C19
V+
C1
0.1 PF
C24
2
J1 1
HP31
3
5
4
2
1
VR1-A
10k
3 ^{8 1.0 PF}
+
1
U1-A
2_-
LME49860NA
2 ^{5 4.7 PF}
+
4
U3
1 _BW
LME49610
R1
4 ^C2
3
C23
1k
JU1
1.0 PF
V-
C5
R3
1k
4.7 PF
C20
R9
1.0 PF
1M
6
LME49860NA
R5
-
1k
7
R10
U1-B
5₊
1M
C6
0.1 PF
V-
V+
C21
3
JU15
5
4
2
JU14
1
2
1.0 PF
0.1 PF
C10
J2 1
JU17
VR1-B
10k
R2
1k
V+
C3
3 ^{8 1.0 PF}
+
1
U2-A
2_-
LME49860NA
4 ^C4
1.0 PF
V-
2 ^{5 4.7 PF}
+
4
U4
1 _BW
LME49610
3
C9
4.7 PF
C22
R4
1k
0.1 PF
V-
C7
R11
1.0 PF
1M
6
LME49860NA
R6
-
1k
7
R12
U2-B
5₊
1M
C8
1.0 PF
HP32
Figure 28. LME49610 Delivers High Output Current for this High Performance Headphone Amplifier
AUDIO BUFFERS
Audio buffers or unity-gain followers, have large current gain and a voltage gain of one. Audio buffers serve
many applications that require high input impedance, low output impedance and high output current. They also
offer constant gain over a very wide bandwidth.
Buffers serve several useful functions, either in stand-alone applications or in tandem with operational amplifiers.
In stand-alone applications, their high input impedance and low output impedance isolates a high impedance
source from a low impedance load.
SUPPLY BYPASSING
The LME49610 will place great demands on the power supply voltage source when operating in applications that
require fast slewing and driving heavy loads. These conditions can create high amplitude transient currents. A
power supply’s limited bandwidth can reduce the supply’s ability to supply the needed current demands during
these high slew rate conditions. This inability to supply the current demand is further exacerbated by PCB trace
or interconnecting wire inductance. The transient current flowing through the inductance can produce voltage
transients.
10
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