Datasheet
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ADC DYNAMIC PERFORMANCE
ADC CHANNEL CHARACTERISTICS
DAC PATH FILTER
TLV320AIC20, TLV320AIC21
TLV320AIC24, TLV320AIC25
TLV320AIC20K, TLV320AIC24K
SLAS363D – MARCH 2002 – REVISED APRIL 2005
With IIR Filter, FS = 8 KHz
TEST
PARAMETER MIN TYP MAX MIN TYP MAX UNIT
CONDITIONS
AIC20/21/24/25 AIC20k/24k
V
I
= -3 dB 82 82
SNR Signal-to-noise ratio
V
I
= -9 dB 76 76
V
I
= -3 dB 83 83
THD Total harmonic distortion dB
V
I
= -9 dB 77 77
V
I
= -3 dB 78 78
Signal-to-harmonic
THD+N
distortion + noise
V
I
= -9 dB 70 70
AIC20/21/24/25/20k/24k
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
V
I(pp)
Differential-ended input level PGA gain = 0 dB 4 V
V
IO
Input offset voltage ±5 mV
I
B
Input bias current 125 µA
Common mode voltage 1.35 V
Dynamic range V
I
= -3 dB 87 dB
Zero Digital
Mute attenuation PGA = MUTE dB
Code
Intrachannel isolation 87 dB
E
G
Gain error V
I
= -3 dB at 1020 Hz -0.45 dB
E
O(ADC)
ADC converter offset error ±15 mV
Common-mode rejection ratio at INMx and
CMRR V
I
= -100 mV at 1020 Hz 50 dB
INPx
Idle channel noise V
(INP,INM,MICIN)
= 0 V 70 µVrms
R
i
Input resistance T
A
= 25°C 10 k Ω
C
i
Input capacitance T
A
= 25°C 2 pF
IIR 5/f
s
S
Channel delay
FIR 17/f
s
S
FS = 8 KHz
(1) (2)
FIR FILTER IIR FILTER
PARAMETER TEST CONDITIONS
MIN TYP MAX MIN TYP MAX UNIT
PATH FILTER, FS = 8 KHz
0 Hz to 200 Hz 0.1 0.05
200 Hz to 300 Hz -0.05 0.05
300 Hz to 2.4 KHz -0.25 0.15 -0.1 0.1
2.4 kHz to 3 kHz -0.3 0.1 -0.2 0.1
Filter gain relative to gain
dB
at 1020 Hz
3 kHz to 3.4 KHz -0.55 0.05 -0.25 0.05
3.4 kHz to 3.6 KHz -30 0
4 KHz -28 -34
4.5 KHz to 72 KHZ -70 -70
(1) The filter gain outside of the passband is measured with respect to the gain at 1020 Hz. The input signal is the digital equivalent of a
sine wave (digital full scale = 0 dB). The nominal differential DAC channel output with this input condition is 4 V
I(PP)
. The pass band is
0 to 3600 Hz for an 8-kHz sample rate. This pass band scales linearly with the conversion rate.
(2) The filter characteristics are specified by design and are not tested in production.
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