Analog characteristics, Cs4228a – Cirrus Logic CS4228A User Manual
Page 5
CS4228A
5
ANALOG CHARACTERISTICS
(Test conditions (unless otherwise specified): Input test signal is a
997 Hz sine wave at 0 dBFS; measurement bandwidth is 10 Hz to 20 kHz; test load R
L
= 10 k
Ω, C
L
= 15 pF)
Notes: 4. Referenced to typical full-scale differential input voltage (2 Vrms). Tested at -1 dBFS
5. Filter characteristics scale with output sample rate.
6. The analog modulator samples the input at 128 times Fs. For example, to obtain an output sample rate
of 48 kHz the input must be sampled at 6.144 MHz. There is no rejection of input signals which are
multiples of the sampling frequency (n × 6.144 MHz ±20.0 kHz where n = 0,1,2,3...).
7. High Pass Filter characteristics are specified for Fs=44.1 kHz.
Base Rate Mode
High Rate Mode
Parameter
Symbol
Min
Typ
Max
Min
Typ
Max
Units
Analog Input Characteristics - Minimum gain setting (0 dB) Differential Input; unless otherwise specified.
Dynamic Range, -60 dBFS input
(A weighted)
(unweighted)
91
97
94
-
-
91
97
94
-
-
dB
dB
Total Harmonic Distortion + Noise
(Note 4) THD+N
-
-88
-83
-
-88
-83
dB
Interchannel Isolation
-
100
-
-
100
-
dB
Interchannel Gain Mismatch
-
0.1
-
-
0.1
-
dB
Offset Error (with high pass filter)
-
-
0
-
-
0
LSB
Full Scale Input Voltage (Differential):
5.24
5.66
6.09
5.24
5.66
6.09
Vp-p
Gain Drift
-
100
-
-
100
-
ppm/°C
Input Resistance
10
-
-
10
-
-
k
Ω
Input Capacitance
-
-
15
-
-
15
pF
A/D Decimation Filter Characteristics
Passband
(Note 5)
0.022
-
21.77 0.022
-
43.54
kHz
Passband Ripple
-
-
0.01
-
-
0.05
dB
Stopband
(Note 5)
30.0
-
6114
72.41
-
6071
kHz
Stopband Attenuation
(Note 6)
80
-
-
45
-
-
dB
Group Delay
t
gd
-
17/Fs
-
-
17/Fs
-
s
Group Delay Variation vs. Frequency
∆ t
gd
-
-
0
-
-
0
µs
High Pass Filter Characteristics
Frequency Response:
-3 dB
(Note 7)
-0.13 dB
-
-
3.4
20
-
-
-
-
3.4
20
-
-
Hz
Hz
Phase Deviation
@ 20 Hz (Note 7)
-
10
-
-
10
-
Degree
Passband Ripple
-
-
0
-
-
0
dB