2.3.1.3 Microphone Bias
PARAMETER
Bias voltage
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
3/4 AVDD − 100 m 3/4 AVDD 3/4 AVDD + 100 m
Bias-current source
Output noise voltage
3
mA
1 kHz to 20 kHz
25
nV/√Hz
2.3.2 DAC
2.3.2.1 Line Output, Load = 10 kΩ, 50 pF
PARAMETER
TEST CONDITIONS
MIN
90
TYP
1.0
MAX
UNIT
0-dB full-scale output voltage (FFFFFF)
V
RMS
AV
AV
AV
AV
= 3.3 V
= 2.7 V
= 3.3 V
= 2.7 V
f
f
= 48kHz
= 48 kHz
100
100
90
DD
DD
DD
DD
s
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3, 4, and 5)
Dynamic range, A-weighted (see Note 4)
dB
s
85
dB
dB
dB
TBD
–88
−92
−85
−88
50
1 kHz, 0 dB
1 kHz, −3 dB
1 kHz, 0 dB
1 kHz, −3 dB
–80
−86
AV
= 3.3 V
= 2.7 V
DD
Total harmonic distortion
AV
DD
Power supply rejection ratio
DAC channel separation
1 kHz, 100 mV
pp
dB
dB
100
NOTES: 3. Ratio of output level with 1-kHz full-scale input, to the output level with the input short circuited, measured A-weighted over a 20-Hz
to 20-kHz bandwidth using an audio analyzer.
4. All performance measurements done with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter
results in higher THD + N and lower SNR and dynamic range readings than shown in the Electrical Characteristics. The low-pass
filter removes out-of-band noise, which, although not audible, may affect dynamic specification values.
5. Ratio of output level with 1-kHz full-scale input, to the output level with all zeros into the digital input, measured A-weighted over
a 20-Hz to 20-kHz bandwidth.
2.3.3 Analog Line Input to Line Output (Bypass)
PARAMETER
0-dB full-scale output voltage
TEST CONDITIONS
MIN
TYP
1.0
95
MAX
UNIT
V
RMS
AV
AV
= 3.3 V
90
DD
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3 and 4)
dB
= 2.7 V
95
DD
1 kHz, 0 dB
–86
−92
−86
−92
50
–80
−86
AV
= 3.3 V
dB
dB
DD
1 kHz, −3 dB
Total harmonic distortion
1 kHz, 0 dB
AV
= 2.7 V
DD
1 kHz, −3 dB
Power supply rejection ratio
1 kHz, 100 mV
1 kHz, 0 dB
dB
dB
pp
DAC channel separation (left to right)
80
NOTES: 3. Ratio of output level with 1-kHz full-scale input, to the output level with the input short circuited, measured A-weighted over a 20-Hz
to 20-kHz bandwidth using an audio analyzer.
4. All performance measurements done with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter
results in higher THD + N and lower SNR and dynamic range readings than shown in the Electrical Characteristics. The low-pass
filter removes out-of-band noise, which, although not audible, may affect dynamic specification values.
2−3
TI [ TEXAS INSTRUMENTS ]
