Filter
Top Products
8−4
8.6 Input Multiplexer
T
A
= 25°C, AV
DD
= 3.3 V, DV
DD
= 3.3 V, f
S
= 48 kHz, 20-bit I
2
S mode
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input impedance 20 kΩ
Crosstalk 85 dB
Full-scale input voltage range 1.7 V
PP
8.7 DAC Interpolation Filter
T
A
= 25°C, AV
DD
= 3.3 V, DV
DD
= 3.3 V, f
S
= 48 kHz, 20-bit I
2
S mode
All terms characterized by frequency are scaled with the normal mode sampling frequency, f
S
. See Figure 8−5 and
Figure 8−6 for performance curves of the DAC digital filter.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Pass band 0.0 20.0 kHz
Pass-band ripple ±0.005 dB
Stop band 24.1 kHz
Stop-band attenuation 28.8 kHz to 3 MHz 75 dB
Group delay 700 µs
−60
−100
Amplitude − dB
−40
−20
f − Frequency − Hz
0
−80
R
0f
s/2
1 f
s
2 f
s
3 f
s
4 f
s
5 f
s
Figure 8−5. DAC Filter Overall Frequency Characteristics
−0.1
0
Amplitude − dB
0.05
0.1
−0.05
0
f − Frequency − Hz
0.1 f
s
0.2 f
s
0.3 f
s
0.4 f
s
0.5 f
s
Figure 8−6. DAC Digital Filter Pass-Band Ripple Characteristics