Datasheet
LM4782, LM4782TABD
SNAS231B –FEBRUARY 2004–REVISED MARCH 2013
www.ti.com
Electrical Characteristics
(1)(2)
The following specifications apply for V
+
= +25V, V
-
= −25V, and R
L
= 8Ω unless otherwise specified. Limits apply for
T
A
= 25°C.
Symbol Parameter Conditions LM4782 Units
(Limits)
Typical
(3)
Limit
(4)(5)
20 V (min)
|V
+
| + |V
-
| Power Supply Voltage
(6)
GND − V
-
≥ 9.5V 18
64 V (max)
V
M
Mute Attenuation V
MUTE
= 2.5V 115 80 dB (min)
THD+N = 0.5% (max)
f = 1kHz; f = 20kHz
P
O
Output Power (RMS) |V
+
| = |V
-
| = 19V, R
L
= 4Ω 20 15 W (min)
|V
+
| = |V
-
| = 22V, R
L
= 6Ω 23 20 W (min)
|V
+
| = |V
-
| = 25V, R
L
= 8Ω 25 20 W (min)
P
O
= 15W, f = 20Hz - 20kHz
A
V
= 26dB
Total Harmonic Distortion +
THD+N |V
+
| = |V
-
| = 19V, R
L
= 4Ω 0.4 %
Noise
|V
+
| = |V
-
| = 22V, R
L
= 6Ω 0.3 %
|V
+
| = |V
-
| = 25V, R
L
= 8Ω 0.2 %
P
O
= 10W, f = 1kHz 70 dB
X
talk
Channel Separation
(7)
P
O
= 10W, f = 10kHz 60 dB
SR Slew Rate V
IN
= 1.414V
RMS
, t
rise
= 2ns 18 12 V/μs (min)
I
DD
Total Quiescent Power Supply V
CM
= 0V, V
O
= 0V, I
O
= 0A
Current V
STANDBY
= GND, Standby = Off 75 120 mA (max)
V
STANDBY
= 5V, Standby = On 8 10 mA (max)
V
OS
Input Offset Voltage V
CM
= 0V, I
O
= 0mA 2.0 15 mV (max)
I
B
Input Bias Current V
CM
= 0V, I
O
= 0mA 0.2 0.5 μA (max)
I
O
Output Current Limit |V
+
| = |V
-
| = 10V, t
ON
= 10ms, V
O
= 0V 3.5 2.9 A (min)
|V
+
- V
O
|, V
+
= 20V, I
O
= +100mA 1.8 2.3 V (max)
V
OD
Output Dropout Voltage
(8)
|V
O
- V
-
|, V
-
= -20V, I
O
= -100mA 2.5 3.2 V (max)
V
+
= 25V to 10V, V
-
= -25V
115 85 dB (min)
V
CM
= 0V, I
O
= 0mA
PSRR Power Supply Rejection Ratio
(9)
V
+
= 25V, V
-
= -25V to -10V
110 85 dB (min)
V
CM
= 0V, I
O
= 0mA
CMRR Common Mode Rejection Ratio
(9)
V
+
= 25V to 10V, V
-
= -10V to -25V 110 80 dB (min)
V
CM
= 10V to -10V, I
O
= 0mA
A
VOL
Open Loop Voltage Gain |V
+
| = |V
-
| = 25V, R
L
= 2kΩ
110 90 dB (min)
ΔV
O
= 20V
GBWP Gain Bandwidth Product |V
+
| = |V
-
| = 25V, f
IN
= 100kHz 7.5 5 MHz (min)
V
IN
= 50mV
RMS
e
IN
Input Noise IHF-A-Weighting Filter, 2.0 8 μV (max)
R
IN
= 600Ω (Input Referred)
(1) All voltages are measured with respect to the ground pins, unless otherwise specified.
(2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication
of device performance.
(3) Typical specifications are measured at 25°C and represent the parametric norm.
(4) Tested limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(5) Datasheet min/max specification limits are specified by design, test, or statistical analysis.
(6) V
-
must have at least - 9.5V at its pin with reference to GND in order for the under-voltage protection circuitry to be disabled. In addition,
the voltage differential between V
+
and V
-
must be greater than 14V.
(7) Cross talk performance was measured using the demo board shown in the datasheet. PCB layout will affect cross talk. It is
recommended that the input and output traces be separated by as much distance as possible. Return ground traces from outputs should
also be independent back to single ground point and use as wide of traces as possible.
(8) The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in
the Typical Performance Characteristics section.
(9) DC electrical test.
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