LM4857 Datasheet, PDF (8/39 Pages) National Semiconductor (TI) – Stereo 1.2W Audio Sub-system with 3D Enhancement

LM4857
SNAS229I – OCTOBER 2003 – REVISED APRIL 2013
www.ti.com
Audio Amplifier Electrical Characteristics V_DD = 3.0V⁽¹⁾⁽²⁾
The following specifications apply for V_DD = 3.0V, unless otherwise specified. Limits apply for T_A = 25°C.
Symbol
Parameter
Conditions
LM4857
Typical⁽³⁾ Limits⁽⁴⁾⁽⁵⁾
V_IN = 0V, No load;
LD5 = RD5 = 0⁽⁶⁾
I_DD
Supply Current
Mode 1, 6, 11
Mode 4, 5, 9, 10, 14, 15
5.5
9
4.5
7.5
I_SD
Shutdown Current
P_O
Output Power
Mode 2, 3, 7, 8, 12, 13
Mode 0⁽⁶⁾
LM4857SP
Speaker; THD+N = 1%;
f = 1kHz; 4Ω BTL
11.2
19
0.06
2.5
530
Speaker; THD+N = 1%;
f = 1kHz; 8Ω BTL
400
320
P_O
Output Power
Headphone; THD+N = 1%;
f = 1kHz; 32Ω SE
Earpiece; THD+N = 1%;
f = 1kHz; 32Ω BTL; CD4 = 0
25
20
30
22
Earpiece; THD+N = 1%;
f = 1kHz; 32Ω BTL; CD4 = 1
30
LD5 = RD5 = 0
Speaker; P_O= 200mW;
f = 1kHz; 8Ω BTL
0.05
THD+N
Total Harmonic Distortion Plus
Noise
Headphone; P_O= 10mW;
f = 1kHz; 32Ω SE
0.04
Earpiece; P_O=10mW;
f = 1kHz; 32Ω BTL; CD4 = 0
0.06
Line Out; V_O= 1V_RMS;
f = 1kHz; 5kΩ SE
0.015
V_OS
Offset Voltage
Speaker; LD5 = RD5 = 0
Earpiece; LD5 = RD5 = 0
A-weighted; 0dB gain;⁽⁷⁾
LD5 = RD5 = 0; All Inputs Terminated
5
40
5
30
Speaker; Mode 2, 3, 7, 8
27
Speaker; Mode 12, 13
38
Headphone; Mode 3, 4, 8, 9
10
Headphone; Mode 13, 14
14
N_OUT
Output Noise
Earpiece; Mode 1
13
Earpiece; Mode 6
18
Earpiece; Mode 11
21
Line Out; Mode 5
11
Line Out; Mode 10
14
Line Out; Mode 15
17
Units
(Limits)
mA (max)
mA (max)
mA (max)
µA (max)
mW
mW (min)
mW (min)
mW (min)
mW
%
%
%
%
mV (max)
mV (max)
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV
(1) All voltages are measured with respect to the GND pin 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 specify specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which specify 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) Typicals are measured at +25°C and represent the parametric norm.
(4) Limits are ensured to AOQL (Average Outgoing Quality Level).
(5) Datasheet min/max specification limits are ensured by design, test, or statistical analysis.
(6) Shutdown current and supply current are measured in a normal room environment. All digital input pins are connected to I²CV_DD.
(7) “0dB gain” refers to the volume control gain setting of M_IN, L_IN, and R_IN set at 0dB.
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