Datasheet

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Digital Inputs and Outputs
ADC PATH FILTER
ADC DYNAMIC PERFORMANCE
TLV320AIC20, TLV320AIC21
TLV320AIC24, TLV320AIC25
TLV320AIC20K, TLV320AIC24K
SLAS363D – MARCH 2002 – REVISED APRIL 2005
FS = 8 KHz, outputs not loaded
PARAMETER MIN TYP MAX UNIT
V
OH
High-level output voltage, DOUT 0.8 IOVDD V
V
OL
Low-level output voltage, DOUT 0.1 IOVDD V
I
IH
High-level input current, any digital input 5 µA
I
IL
Low-level input current, any digital input 5 µA
C
i
Input capacitance 3 pF
C
o
Output capacitance 5 pF
FS = 8 KHz
(1) (2)
TEST
PARAMETER MIN TYP MAX MIN TYP MAX UNIT
CONDITIONS
PATH FILTER FIR FILTER IIR FILTER
0 Hz to 60 Hz -27 / 0.07 -27 / 0.15
60 Hz to 200 Hz -1 / 0.07 -0.75 / 0.15
200 Hz to 300 Hz -0.03 / 0.05 0. 11 / 0.15
300 Hz to 2.4 KHz -0.1 0.15 -0.1 0.25
Filter gain relative to gain
2.4 kHz to 3 kHz -0.05 0.15 -0.5 0.2 dB
at 1020 Hz
3 kHz to 3.4 KHz -0.5 0.1 -0.5 0.2
3.4 kHz to 3.6 KHz -0.4 0.15
4 KHz -26 -42
4.5 KHz to 72 kHz -52 -52
(1) The filter gain outside of the passband is measured with respect to the gain at 1020 Hz. The analog input test signal is a sine wave with
0 dB = 4 V
I(PP)
as the reference level for the analog input signal. The pass band is 0 to 3600 Hz for an 8-KHz sample rate. This pass
band scales linearly with the sample rate.
(2) The filter characteristics are specified by design and are not tested in production. In places where more than one value is specified, the
first value is with the High Pass Filter on and the second value is with the HPF off
With FIR Filter, FS = 8 KHz
(1)
TEST
PARAMETER MIN TYP MAX MIN TYP MAX UNIT
CONDITIONS
Line In Driver AIC20/21/24/25 AIC20k/24k
V
I
= -3 dB 81 84 70 84
SNR Signal-to-noise ratio
V
I
= -9 dB 73 76 76
V
I
= -3 dB 83 90 70 90
THD Total harmonic distortion dB
V
I
= -9 dB 81 88 88
V
I
= -3 dB 80 83 83
Signal-to-harmonic
THD+N
distortion + noise
V
I
= -9 dB 73 76 76
(1) The test condition is a differential 1020-Hz input signal with an 8-KHz conversion rate. Input and output common mode is 1.35 V.
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