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LM49251 Scheda tecnica(PDF) 7 Page - Texas Instruments

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Il numero della parte LM49251
Spiegazioni elettronici  Stereo Audio Subsystem with Class G Headphone Amplifier and Class D Speaker Amplifier with Speaker Protection
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM49251
www.ti.com
SNAS498A – FEBRUARY 2011 – REVISED APRIL 2013
Electrical Characteristics
(1)(2)(3) (continued)
The following specifications apply for AV = 0dB, RL = 15μH+8Ω+15μH (Loudspeaker), RL = 32Ω (Headphone), CSET = 100nF, f
= 1kHz, ALC off, unless otherwise specified. Limits apply for TA = 25°C.
LM49251
Units
Parameter
Test Conditions
(Limits)
Typ(4)
Limit(5)
LS Mode
11.5
dB (min)
Gain 0
12
12.5
dB (max)
17.5
dB (min)
Gain 1
18
19
dB (max)
HP Mode
–0.5
dB (min)
Gain 0
0
0.5
dB (max)
AV
Gain
Gain 1
–1.7
dB
Gain 2
–3
dB
Gain 3
–6
dB
Gain 4
–9
dB
Gain 5
–12
dB
Gain 6
–15
dB
–18.5
dB (min)
Gain 7
–18
–17.5
dB (max)
LS Output
–93
dB
AV(MUTE)
Mute Attenuation
HP Output
–98
dB
MONO, RIN, LIN inputs
9.5
k
Ω min)
Maximum Gain Setting
13
RIN
Input Resistance
15.5
k
Ω (max)
97
k
Ω (min)
Minimum Gain Setting
110
122
k
Ω (max)
Mode 3, AV = 18dB, RL = 8Ω
LSVDD = 3.3V
570
mW
LSVDD = 3.6V
680
600
mW (min)
LSVDD = 4.2V
955
mW
PO
Output Power
LSVDD = 5.0V
1370
mW
Mode 6
RL = 16Ω
20
mW
RL= 32Ω
20
16
mW (min)
f = 1kHz, Mode 3
0.02
%
Mono Input, PO = 250mW
THD+N
Total Harmonic Distortion + Noise
f = 1kHz, Mode 6
0.02
%
Stereo Input, PO = 12mW
f = 217Hz, VRIPPLE = 200mVP-P, Inputs AC GND, CB = 2.2μF
Mode 3, mono input, AV = 6dB
77
dB
Mode 2, stereo input, AV = 6dB
65
dB
PSRR
Power Supply Rejection Ratio
Mode 4, ripple on VDD, mono input
93
dB
Mode 4, ripple on HPVDD, mono input
83
dB
Mode 6, ripple on VDD, stereo input
80
dB
Mode 6, ripple on HPVDD, stereo input
80
dB
VRIPPLE = 1VP-P, fRIPPLE = 217Hz, mono input
CMRR
Common Mode Rejection Ratio
Mode 3
52
dB
Mode 4
63
dB
η
Efficiency
LS Mode, PO = 680mW
90
%
XTALK
Crosstalk
PO = 12mW, f = 1kHz, Mode 6
84
dB
Copyright © 2011–2013, Texas Instruments Incorporated
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