Datasheet

ELECTRICAL CHARACTERISTICS
TLV320AIC31
www.ti.com ............................................................................................................................................. SLAS497C – AUGUST 2006 – REVISED DECEMBER 2008
At +25 ° C, AVDD, DRVDD, IOVDD = 3.3 V, DVDD = 1.8 V, F
S
= 48 kHz, 16-bit audio data (unless otherwise noted).
TLV320AIC31
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
AUDIO ADC
Input signal level (0 dB) Single-ended input 0.707 V
RMS
Signal-to-noise ratio, F
S
= 48 kHz, 0-dB PGA gain, IN1 inputs selected
80 92 dB
A-weighted
(1) (2)
and ac-shorted together
F
S
= 48 kHz, 1-kHz – 60 dB full-scale input applied
Dynamic range, A-weighted
(1) (2)
92 dB
at IN1 inputs, 0-dB PGA gain
– 90 – 75 dB
F
S
= 48 kHz, 1-kHz – 2dB full-scale input applied at
THD Total harmonic distortion
IN1 inputs, 0-dB PGA gain
0.003% 0.018%
1 kHz, 100 mV
PP
on AVDD, DRVDD, single-ended
46
input
Power-supply rejection ratio dB
1 kHz, 100 mV
PP
on AVDD, DRVDD, differential
68
input
ADC channel separation 1 kHz, – 1 dB IN2L to IN2R – 87 dB
ADC gain error 1-kHz input, 0-dB PGA gain 0.7 dB
ADC programmable gain amplifier
1-kHz input tone, R
SOURCE
< 50 Ω 59.5 dB
maximum gain
ADC programmable gain amplifier
0.5 dB
step size
IN1 inputs, routed to single ADC Input mix
20
attenuation = 0 dB
IN2 inputs, input mix attenuation = 0 dB 20
Input resistance k Ω
IN1 inputs, Input mix attenuation = – 12 dB 80
IN2 inputs, Input mix attenuation = – 12 dB 80
Input capacitance IN1 inputs 10 pF
Input level control minimum
0 dB
attenuation setting
Input level control maximum
12 dB
attenuation setting
Input level control attenuation
1.5 dB
step size
ADC DIGITAL DECIMATION FILTER, F
S
= 48 kHz
Filter gain from 0 to 0.39 F
S
± 0.1 dB
Filter gain at 0.4125 F
S
– 0.25 dB
Filter gain at 0.45 F
S
– 3 dB
Filter gain at 0.5 F
S
– 17.5 dB
Filter gain from 0.55 F
S
to 64 F
S
– 75 dB
Filter group delay 17/F
S
Sec
MICROPHONE BIAS
2.0
Bias voltage Programmable settings, load = 750 Ω 2.25 2.5 2.75 V
AVDD – 0.2
Current sourcing 2.5 V setting 4 mA
(1) Ratio of output level with 1-kHz full-scale sine wave input, to the output level with the inputs short-circuited, measured A-weighted over a
20-Hz to 20-kHz bandwidth using an audio analyzer.
(2) All performance measurements made with 20-kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter may
result 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.
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