2.3 Electrical Characteristics Over Recommended Operating Conditions, AV
DD
,
HPV
DD
, BV
DD
= 3.3 V, DV
DD
= 1.5 V, Slave Mode, XTI/MCLK = 256fs, f
s
= 48 kHz
(unless otherwise stated)
2.3.1
ADC
2.3.1.1 Line Input to ADC
PARAMETER
Input signal level (0 dB)
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3
and 4)
Dynamic range, A-weighted, −60-dB full-scale input (see
Note 4)
Total harmonic distortion, −1-dB input, 0-dB gain
Power supply rejection ratio
ADC channel separation
Programmable gain
Programmable gain step size
Mute attenuation
Input resistance
Input capacitance
AVDD = 3.3 V
AVDD = 2.7 V
AVDD = 3.3 V
AVDD = 2.7 V
1 kHz, 100 mVpp
1 kHz input tone
1 kHz input tone, RSOURCE < 50
Ω
Monotonic
0 dB, 1 kHz input tone
12 dB Input gain
0 dB input gain
10
30
35
10
–34.5
1.5
80
20
kΩ
pF
fs = 48 kHz (3.3 V)
fs = 48 kHz (2.7 V)
85
85
TEST CONDITIONS
MIN
TYP
1
90
90
90
90
–80
80
50
90
12
dB
dB
dB
dB
dB
dB
dB
dB
MAX
UNIT
VRMS
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.
2.3.1.2 Microphone Input to ADC, 0-dB Gain, f
s
= 8 kHz (40-KΩ Source Impedance, see Section 1.2,
Functional Block Diagram)
PARAMETER
Input signal level (0 dB)
Signal-to-noise ratio, A-weighted, 0-dB gain (see Notes 3 and 4)
Dynamic range, A-weighted, −60-dB full-scale input (see Note 4)
Total harmonic distortion, −1-dB input, 0-dB gain
Power supply rejection ratio
Programmable gain boost
Microphone-path gain
Mute attenuation
Input resistance
Input capacitance
AVDD = 3.3 V
AVDD = 2.7 V
AVDD = 3.3 V
AVDD = 2.7 V
AVDD = 3.3 V
AVDD = 2.7 V
1 kHz, 100 mVpp
1 kHz input tone, RSOURCE < 50
Ω
MICBOOST = 0, RSOURCE < 50
Ω
0 dB, 1 kHz input tone
60
8
80
80
TEST CONDITIONS
MIN
TYP
1.0
85
84
85
84
–60
−60
50
20
14
80
14
10
dB
dB
dB
dB
dB
kΩ
pF
dB
dB
MAX
UNIT
VRMS
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.
2−2
TI [ TEXAS INSTRUMENTS ]
