23
2.3.1.3 Microphone Bias
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Bias voltage
3/4 AVDD 100 m
3/4 AVDD
3/4 AVDD + 100 m
V
Bias-current source
3
mA
Output noise voltage
1 kHz to 20 kHz
25
nV/
√Hz
2.3.2
DAC
2.3.2.1 Line Output, Load = 10 k
, 50 pF
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0-dB full-scale output voltage (FFFFFF)
1.0
VRMS
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3, 4, and 5)
AVDD = 3.3 V
fs = 48kHz
90
100
dB
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3, 4, and 5)
AVDD = 2.7 V
fs = 48 kHz
100
dB
Dynamic range, A-weighted (see Note 4)
AVDD = 3.3 V
85
90
dB
Dynamic range, A-weighted (see Note 4)
AVDD = 2.7 V
TBD
dB
AVDD = 3.3 V
1 kHz, 0 dB
–88
–80
dB
Total harmonic distortion
AVDD = 3.3 V
1 kHz, 3 dB
92
86
dB
Total harmonic distortion
AVDD = 2.7 V
1 kHz, 0 dB
85
dB
AVDD = 2.7 V
1 kHz, 3 dB
88
dB
Power supply rejection ratio
1 kHz, 100 mVpp
50
dB
DAC channel separation
100
dB
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
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0-dB full-scale output voltage
1.0
VRMS
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3 and 4)
AVDD = 3.3 V
90
95
dB
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3 and 4)
AVDD = 2.7 V
95
dB
AVDD = 3.3 V
1 kHz, 0 dB
–86
–80
dB
Total harmonic distortion
AVDD = 3.3 V
1 kHz, 3 dB
92
86
dB
Total harmonic distortion
AVDD = 2.7 V
1 kHz, 0 dB
86
dB
AVDD = 2.7 V
1 kHz, 3 dB
92
dB
Power supply rejection ratio
1 kHz, 100 mVpp
50
dB
DAC channel separation (left to right)
1 kHz, 0 dB
80
dB
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.