Cirrus Logic CS42L55 - Manual (Page 12)

12 DS773F1
CS42L55
ANALOG INPUT CHARACTERISTICS
Test Conditions (unless otherwise specified): Connections to the CS42L55 are shown in the Figure 1. "Typical Connection Dia-
gram" on page 10 ; Input is a 1 kHz sine wave through the passive input filter, PGA = 0 dB; All Supplies = VA;
GND = AGND = 0 V; T
A
= +25 °C; Measurement bandwidth is 20 Hz to 20 kHz. Sample Frequency = 48 kHz.
4. Referred to the typical full-scale voltage. Applies to all THD+N and Dynamic Range values in the table.
5. See test figure shown below.
6. SDOUT Code with HPFx=1;HPFRZx=0.
7. Measured between AINxx and AGND.
VA = 2.5 V VA = 1.8 V
Parameter (Note 4) Min Typ Max Min Typ Max Unit
Analog In to ADC (PGA bypassed)
Dynamic Range A-weighted
unweighted
89
86 95
92 -
- 86
83 92
89 -
- dB
dB
Total Harmonic Distortion + Noise -1 dBFS
-20 dBFS
-60 dBFS
-
-
- -85
-72
-32 -79
-
-26
-
-
- -85
-69
-29 -79
-
-23
dB
dB
dB
Analog In to PGA to ADC
Dynamic Range
PGA Setting: 0 dB A-weighted
unweighted
88
85 94
91 -
- 85
82 91
88 -
- dB
dB
PGA Setting: +12 dB A-weighted
unweighted
81
78 87
84 -
- 78
75 84
81 -
- dB
dB
Total Harmonic Distortion + Noise
PGA Setting: 0 dB -1 dBFS
-60 dBFS
-
- -87
-31 -81
-25 -
- -85
-28 -79
-22 dB
dB
PGA Setting: +12 dB -1 dBFS - -83 -77 - -81 -75 dB
Common Mode Rejection (Note 5) - 40 - - 40 - dB
DC Accuracy
Interchannel Gain Mismatch - 0.2 - - 0.2 - dB
Gain Drift - ±100 - - ±100 - ppm/°C
Offset Error (Note 6) - 352 - - 352 - LSB
Input
Interchannel Isolation (1 kHz) - 90 - - 90 - dB
HP Amp to Analog Input Isolation R
L
= 10 k Ω
R
L
= 16 Ω
-
- 90
83 -
- -
- 90
83 -
- dB
dB
Full-scale Input Voltage ADC
PGA (0 dB)
PGA (+12 dB)
0.76•VA
0.78•VA 0.80•VA
0.82•VA
0.198•VA
0.84•VA
0.86•VA 0.76•VA
0.78•VA 0.80•VA
0.82•VA
0.198•VA
0.84•VA
0.86•VA Vpp
Vpp
Vpp
Input Impedance (Note 7) ADC
PGA -
- 60
40 -
- -
- 60
40 -
- k Ω
k Ω
100 mV
PP
,
25 Hz
100 Ω
1 μF
AINxA
AINxREF
Figure 2. CMRR Test Configuration