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