LM4930 Datasheet, PDF (13/40 Pages) National Semiconductor (TI) – Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers

LM4930
www.ti.com
SNAS212C – JULY 2003 – REVISED MAY 2013
Electrical Characteristics DV_DD = 3V, AV_DD = 3V, R_LHP = 32Ω, R_LHF = 8Ω^(1)(2)(3) (continued)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T_A= 25°C.
Parameter
Test Conditions
LM4930
Typ⁽⁴⁾ Limits ⁽⁵⁾⁽⁶⁾
Units
(Limits)
SNR
Signal-to-Noise Ratio
Signal = Vo at f = 1kHz @1% THD+N, 32Ω
72
dB
(Voice) (Voice DAC Path)
Stereo Load; Noise = digital zero, A-
weighted; 0dB gain setting
SNR
Signal-to-Noise Ratio (Music Audio Signal = Vo at f = 1kHz @1% THD+N, 32Ω
86
dB
(Music) Path)
Stereo Load; Noise = digital zero, A-
weighted; 0dB gain setting
DR
Dynamic Range (Voice DAC Path) Signal = Vo at f = 1kHz @1% THD+N, 32Ω
72
dB
(Voice)
Stereo Load; Noise for -60dBFS digital input;
A-weighted, 0dB gain setting
DR
Dynamic Range (Music Audio Path) Signal = Vo at f=1kHz @1% THD+N, 32Ω
86
dB
(Music)
Stereo Load; Noise for -60dBFS digital input;
A-weighted, 0dB gain setting
SNR_ADC Signal-to-Noise Ratio
Reference signal = 0dBFS
75
dB
(Voice ADC Path)
MIC_P, MIC_N terminated with 10Ω to
ground;
A-weighted; 47dB MIC preamp gain setting
DR_ADC Dynamic Range
Reference signal = 0dBFS
75
dB
(Voice ADC Path)
Noise for -60dBFS digital input;
A-weighted; 47dB MIC preamp gain setting
X_TALK
Stereo Channel-to-Channel
f_S = 48kHz, f_IN = 1kHz sinewave at -3dB_FS
73
dB
Crosstalk
V_MIC-IN Maximum Differential MIC Input
17dB MIC Preamp gain setting
570
Voltage
mV_P-P
R_VDAC
R_VADC
PB_VDAC
SBA_VDAC
UPB_VADC
Voice DAC Ripple
Voice ADC Ripple
Voice DAC Passband
Voice DAC Stopband Attenuation
Voice ADC Upper Passband Cutoff
Frequency.
300Hz - 3.3kHz through head-phone output.
300Hz - 3.3kHz through head-phone output.
-3dB Point
Above 4kHz
Upper -3dB Point
+/-0.15
+/-0.25
3.46
72
3.47
+/-0.2
+/-0.3
dB (max)
dB (max)
kHz
dB
kHz
LPB_VADC Voice ADC Lower Passband Cutoff Lower -3dB Point
Frequency.
0.230
kHz
SBA_VADC
SBA_NOTC
H
R_DAC
PB_DAC
SBA_DAC
DR_DAC
Voice ADC Stopband Attenuation
Voice ADC Notch Attenuation
Audio DAC Ripple
Audio DAC Passband Width
Audio DAC Stopband Attenuation
Audio DAC Dynamic Range Digital
Filter Section
Above 4kHz
Centered on 55Hz, figure gives worst case
attenuation for 50Hz & 60Hz.
20Hz - 20kHz through head-phone output.
-3dB point
Above 24kHz
Signal = VO at f = 1kHz @ 1% THD+N;
f = 1kHz; Noise for -60dBFS digital input;
0dB gain; A-weighted
65
58
+/-0.1
22.7
76
97
+/-0.2
dB
dB
dB (max)
kHz
dB
dB
SNR_DAC Audio DAC SNR Digital Filter
Signal = VO at f = 1kHz @ 1% THD+N;
97
dB
Section
f = 1kHz; Noise for -60dBFS digital input;
0dB gain; A-weighted
ΔA_CH-CH Stereo Channel-to-Channel Gain
Mismatch
0.3
dB
V_IL
Digital Input: Logic Low Voltage
Level
0.4
V
V_IH
Digital Input: Logic High Voltage
Level
1.4
V
Volume Control Range (Headphone Maximum Attenuation
amplifiers)
Minimum Attenuation
-46.5
dB
0
dB
Volume Control Range (Mono
speaker amplifier)
Minimum Gain
Maximum Gain
-34.5
dB
12
dB
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