Datasheet
LM4780, LM4780TABD
www.ti.com
SNAS193B –JULY 2003–REVISED APRIL 2013
Electrical Characteristics
(1)(2)
The following specifications apply for V
+
= +35V, V
-
= −35V, I
MUTE
= -1mA and R
L
= 8Ω unless otherwise specified. Limits
apply for T
A
= 25°C.
LM4780
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)(5)
20 V (min)
|V
+
| + |V
-
| Power Supply Voltage
(6)
GND − V
-
≥ 9V 18
84 V (max)
A
M
Mute Attenuation I
MUTE
= 0mA 110 80 dB (min)
THD+N = 0.5% (max)
f = 1kHz; f = 20kHz
P
O
Output Power (RMS) |V
+
| = |V
-
| = 25V, R
L
= 4Ω 55 50 W (min)
|V
+
| = |V
-
| = 30V, R
L
= 6Ω 55 50 W (min)
|V
+
| = |V
-
| = 35V, R
L
= 8Ω 60 50 W (min)
P
O
= 30W, f = 20Hz - 20kHz
A
V
= 26dB
Total Harmonic Distortion +
THD+N |V
+
| = |V
-
| = 25V, R
L
= 4Ω 0.07 %
Noise
|V
+
| = |V
-
| = 30V, R
L
= 6Ω 0.05 %
|V
+
| = |V
-
| = 35V, R
L
= 8Ω 0.03 %
P
O
= 10W, f = 1kHz 70 dB
X
talk
Channel Separation
(7)
P
O
= 10W, f = 10kHz 72 dB
SR Slew Rate V
IN
= 2.0V
P-P
, t
RISE
= 2ns 19 8 V/μs (min)
Total Quiescent Power V
CM
= 0V, 110 170 mA (max)
I
DD
Supply Current V
O
= 0V, I
O
= 0A
V
OS
Input Offset Voltage V
CM
= 0V, I
O
= 0mA 1 10 mV (max)
I
B
Input Bias Current V
CM
= 0V, I
O
= 0mA 0.2 1 μA (max)
I
O
Output Current Limit |V
+
| = |V
-
| = 20V, t
ON
= 10ms 11.5 7 A (min)
|V
+
- V
O
|, V
+
= 28V, I
O
= +100mA 1.6 2.0 V (max)
V
OD
Output Dropout Voltage
(8)
|V
-
- V
O
|, V
-
= -28V, I
O
= -100mA 2.5 3.0 V (max)
V
+
= 40V to 20V, V
-
= -40V,
120 85 dB (min)
V
CM
= 0V, I
O
= 0mA
PSRR Power Supply Rejection Ratio
(9)
V
+
= 40V, V
-
= -40V to -20V,
105 85 dB (min)
V
CM
= 0V, I
O
= 0mA
V
+
= 60V to 20V, V
-
= -20V to -60V,
CMRR Common Mode Rejection Ratio
(9)
110 85 dB (min)
V
CM
= 20V to -20V, I
O
= 0mA
A
VOL
Open Loop Voltage Gain R
L
= 2kΩ, ΔV
O
= 40V 115 90 dB (min)
GBWP Gain Bandwidth Product f
IN
= 100kHz, V
IN
= 50mV
RMS
8 2 MHz (min)
IHF-A-Weighting Filter,
e
IN
Input Noise 2.0 10 μV (max)
R
IN
= 600Ω (Input Referred)
P
O
= 1W
RMS
; A-Weighted Filter
97 dB
f
IN
= 1kHz, R
S
= 25Ω
SNR Signal-to-Noise Ratio
P
O
= 50W
RMS
; A-Weighted Filter
114 dB
f
IN
= 1kHz, R
S
= 25Ω
(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 specified 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 specified to 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 - 9V 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 input and output traces be separated by as much distance as possible. Return ground traces from outputs should be
independent back to a single ground point and use as wide of traces as possible.
(8) The output dropout voltage is defined as 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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