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LM4937 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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LM4937 bảng dữ liệu(HTML) 5 Page - Texas Instruments

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LM4937
www.ti.com
SNAS369J – OCTOBER 2006 – REVISED MAY 2013
AUDIO AMPLIFIER ELECTRICAL CHARACTERISTICS AVDD = 3.0V, DVDD = 3.0V
(1)(2) (continued)
The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise
specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
LM4937
Units
(Limits)
Typical(3)
Limits(4)(5)
Speaker; THD = 1%; f = 1kHz, 8
Ω BTL
420
370
mW (min)
PO
Output Power
Headphone; THD = 1%; f = 1kHz, 32
Ω SE
27
24
mW (min)
Earpiece; THD = 1%; f = 1kHz, 32
Ω BTL
45
40
mW (min)
VFS DAC
Full Scale DAC Output
2.4
Vpp
Speaker; PO = 200mW;
0.04
%
f = 1kHz, 8
Ω BTL
Headphone; PO = 10mW;
THD+N
Total Harmonic Distortion
0.01
%
f = 1kHz, 32
Ω SE
Earpiece; PO = 20mW;
0.04
%
f = 1kHz, 32
Ω BTL
Speaker
10
55
mV (max)
VOS
Offset Voltage
Earpiece
8
50
mV (max)
Headphone (OCL)
8
40
mV (max)
O
Output Noise
A = weighted; 0dB gain;
Table 1
See Table 1
PSRR
Power Supply Rejection Ratio
f = 217Hz; Vripple = 200mVP-P
Table 2
CB = 2.2μF; See Table 2
Headphone; PO= 10mW
Xtalk
Crosstalk
–60
dB
f = 1kHz; OCL
TWU
Wake-Up Time
CB = 2.2μF, CD6 = 0
35
ms (max)
CB = 2.2μF, CD6 = 1
85
ms (max)
CMRR
Common-Mode Rejection Ratio
f = 217Hz, VRMS = 200mVpp
56
dB
AUDIO AMPLIFIER ELECTRICAL CHARACTERISTICS AVDD = 5.0V, DVDD = 3.3V
(1) (2)
The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise
specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
LM4937
Units
(Limits)
Typical(3)
Limits(4)(5)
VIN = 0, No Load
17.5
mA (max)
All Amps On + DAC, OCL(6)
Headphone Mode Only (OCL)
5.8
mA (max)
IDD
Supply Current
Mono Loudspeaker Mode Only(6)
11.6
mA (max)
Mono Earpiece Mode Only(6)
5
mA (max)
DAC Off, All Amps On (OCL)(6)
12.9
mA (max)
ISD
Shutdown Current
1.6
μA (max)
Speaker; THD = 1%;
1.25
mW (min)
f = 1kHz, 8
Ω BTL
Headphone; THD = 1%;
PO
Output Power
80
mW (min)
f = 1kHz, 32
Ω SE
Earpiece; THD = 1%;
175
mW (min)
f = 1kHz, 32
Ω BTL
(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 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)
Typicals are measured at 25°C and represent the parametric norm.
(4)
Limits are specified to AOQL (Average Outgoing Quality Level).
(5)
Datasheet min/max specification limits are specified by design, test, or statistical analysis.
(6)
Enabling mono bit (D_6 in Output Control Register 01h) will save 400
μA (typ) from specified current.
Copyright © 2006–2013, Texas Instruments Incorporated
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