LM3875 Datasheet, PDF (5/29 Pages) National Semiconductor (TI) – OverturTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier

LM3875
www.ti.com
SNAS083D – JUNE 1999 – REVISED APRIL 2013
Electrical Characteristics⁽¹⁾⁽²⁾
The following specifications apply for V⁺ = +35V, V^− = −35V with R_L = 8Ω unless otherwise specified. Limits apply for T_A =
25°C.
Symbol
|V⁺| + |V^−|
Parameter
Power Supply Voltage
Conditions
P_O ⁽⁵⁾
Output Power (Continuous Average) THD + N = 0.1% (Max)
f = 1 kHz, f = 20 kHz
LM3875
Typical⁽³⁾ Limit⁽⁴⁾
20
84
56
40
Units
(Limits)
V (Min)
V (Max)
W (Min)
Peak P_O
THD + N
SR ⁽⁵⁾
I+
Instantaneous Peak Output Power
Total Harmonic Distortion Plus Noise
Slew Rate⁽⁶⁾
Total Quiescent Power Supply
Current ⁽⁷⁾
40W, 20 Hz ≤ f ≤ 20 kHz
A_V = 26 dB
V_IN = 1.414 Vrms, f = 10 kHz
Square-wave, R_L = 2 kΩ
V_CM = 0V, V_O = 0V, I_o = 0 mA
100
W
0.06
%
11
5
V/µs (Min)
30
70
mA (Max)
V_OS
Input Offset
Voltage ⁽⁷⁾
V_CM = 0V, I_o = 0 mA
V_CM = 0V, I_o = 0 mA
1
10
mV (Max)
0.2
1
µA (Max)
I_OS
I_o
V_od ⁽⁷⁾
Input Offset Current
Output Current Limit
Output Dropout Voltage⁽⁸⁾
PSRR
Ratio ⁽⁷⁾
Power Supply Rejection
CMRR ⁽⁷⁾
A_VOL ⁽⁷⁾
GBWP
e_IN ⁽⁵⁾
Common Mode Rejection Ratio
Open Loop Voltage Gain
Gain-Bandwidth Product
Input Noise
Signal-to-Noise Ratio
SNR
IMD
Intermodulation Distortion Test
V_CM = 0V, I_o = 0 mA
|V⁺| = |V^−| = 10V, t_on = 10 ms, V_O = 0V
|V⁺−V_o^−|, V⁺ = 20V, I_o = +100 mA
|V_o−V^−|, V^− = −20V, I_o = −100 mA
V⁺ = 40V to 20V, V^− = −40V,
V_cm = 0V, I_o = 0 mA
V⁺ = 40V, V = −40V to −20V,
V_cm = 0V, I_o = 0 mA
V⁺ = 60V to 20V, V^− = −20V to −60V,
V_cm = 20V to −20V, I_o = 0 mA
|V⁺| = |V^−| = 40V, R_L = 2 kΩ, ΔV_O = 60V
|V⁺| = |V^−| = 40V
f_O = 100 kHz, V_IN = 50 mVrms
IHF − A Weighting Filter
R_IN = 600Ω (Input Referred)
P_O = 1W, A-Weighted,
Measured at 1 kHz, R_S =25Ω
P_O = 40W, A-Weighted,
Measured at 1 kHz, R_S =25Ω
P_pk = 100W, A-Weighted,
Measured at 1 kHz, R_S =25Ω
60 Hz, 7 kHz, 4:1 (SMPTE)
60 Hz, 7 kHz, 1:1 (SMPTE)
0.01
6
1.6
2.7
120
120
120
120
8
2.0
98 dB
114 dB
122 dB
0.004
0.006
0.2
µA (Max)
4
A(Min)
5
V (Max)
5
V (Max)
85
85
dB (Min)
80
dB (Min)
90
dB (Min)
2
MHz (Min)
8.0
µV (Max)
dB
dB
dB
%
(1) 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.
(2) All voltages are measured with respect to supply GND, unless otherwise specified.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Limits are ensured to AOQL (Average Outgoing Quality Level).
(5) AC Electrical Test; refer to Test Circuit #2.
(6) The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the
high frequency roll-off. Without feedback compensation, the slew rate is typically 16V/μs.
(7) DC Electrical Test; refer to Test Circuit #1.
(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.
Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM3875
Submit Documentation Feedback
5