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LM4947 Datasheet(PDF) 6 Page - Texas Instruments

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Part No. LM4947
Description  Mono Class D and Stereo Audio Sub-System
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM4947 Datasheet(HTML) 6 Page - Texas Instruments

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LM4947, LM4947TLEVAL
SNAS349D – JUNE 2006 – REVISED MAY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS 3.3V
(1)(2) (continued)
The following specifications apply for VDD = 3.3V, TA = 25°C, and all gains are set for 0dB unless otherwise specified.
Symbol
Parameter
Conditions
LM4947
Units
(Limits)
Typical(3)
Limits(4)
A-weighted, 0dB
inputs terminated, output referred
Speaker; Mode 1
39
μV
Speaker; Mode 3
39
μV
Speaker; Mode 5
42
μV
Speaker; Mode 7
38
μV
NOUT
Output Noise
Headphone; SE, Mode 2
15
μV
Headphone; SE, Mode 4
15
μV
Headphone; SE, Mode 6
17
μV
Headphone; OCL, Mode 2
12
μV
Headphone; OCL, Mode 4
15
μV
Headphone; OCL, Mode 6
17
μV
VRIPPLE = 200mVPP; f = 217Hz,
RL = 8Ω, CB = 2.2µF, BTL
All audio inputs terminated to GND;
output referred
Power Supply Rejection Ratio
BTL, Output Mode 1
79
dB
Loudspeaker out
BTL, Output Mode 3
78
dB
BTL, Output Mode 5
79
dB
BTL, Output Mode 7
80
dB
VRIPPLE = 200mVPP; f = 217Hz,
PSRR
RL = 32Ω, CB = 2.2µF, BTL
All audio inputs terminated to GND;
output referred
SE, Output Mode 2
78
dB
Power Supply Rejection Ratio
SE, Output Mode 4
71
dB
ROUT and LOUT
SE, Output Mode 6
71
dB
OCL, Output Mode 2
83
dB
OCL, Output Mode 4
74
dB
OCL, Output Mode 6
74
dB
η
Class D Efficiency
Output Mode 1, 3, 5
86
%
f = 217Hz, VCM = 1Vpp,
CMRR
Common-Mode-Rejection Ratio
–49
dB
Mode 1, BTL, RL = 8Ω
Headphone, PO = 12mW,
–58
dB
f = 1kHz, OCL, Mode 4, RL = 32Ω
XTALK
Crosstalk
Headphone, PO = 12mW,
–73
dB
f = 1kHz, SE, Mode 4, RL = 32Ω
CB = 2.2µF, OCL, RL = 32Ω
90
ms
TWU
Wake-Up Time from Shutdown
CB = 2.2µF, SE, RL = 32Ω
115
ms
Volume Control Step Size Error
±0.2
dB
–60.25
dB (min)
Input referred maximum attenuation
-59.5
–58.75
dB (max)
Digital Volume Range
17.25
dB (min)
Input referred maximum gain
+18
18.75
dB (max)
Mute Attenuation
Output Mode 1, 3, 5
87
dB (min)
8
k
Ω (min)
Maximum gain setting
12
14
k
Ω (max)
MONO_IN Input Impedance
RIN and LIN Input Impedance
75
k
Ω (min)
Maximum attenuation setting
100
125
k
Ω (max)
6
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LM4947 LM4947TLEVAL


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