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Electrical characteristics<br />
<strong>STM32W108C8</strong><br />
Table 141. ADC module key parameters for 1 MHz sampling (1) (continued)<br />
Parameter<br />
Performance<br />
THD (dB)<br />
Single-Ended<br />
Differential<br />
-45<br />
-45<br />
-54<br />
-54<br />
-62<br />
-63<br />
-67<br />
-71<br />
-69<br />
-75<br />
-69<br />
-76<br />
-69<br />
-76<br />
-<br />
69<br />
-76<br />
ENOB (from SNR)<br />
Single-Ended<br />
Differential<br />
5.6<br />
5.6<br />
7.1<br />
7.1<br />
8.6<br />
8.6<br />
10.0<br />
10.1<br />
11.3<br />
11.4<br />
12.2<br />
12.5<br />
12.4<br />
12.9<br />
12.5<br />
12.9<br />
ENOB (from SINAD)<br />
Single-Ended<br />
Differential<br />
5.5<br />
5.6<br />
7.0<br />
7.0<br />
8.5<br />
8.5<br />
9.9<br />
10.0<br />
10.9<br />
11.3<br />
11.2<br />
12.1<br />
11.3<br />
12.3<br />
11.3<br />
12.4<br />
Equivalent ADC Bits 7 [15:9] 8 [15:8]<br />
9<br />
[15:7]<br />
10<br />
[15:6]<br />
11<br />
[15:5]<br />
12<br />
[15:4]<br />
13<br />
[15:3]<br />
14<br />
[15:2]<br />
1. INL and DNL are referenced to a LSB of the Equivalent ADC Bits shown in the last row of Table 141.<br />
ENOB (effective number of bits) can be calculated from either SNR (signal to non-harmonic noise ratio) or<br />
SINAD (signal-to-noise and distortion ratio).<br />
Table 142 describes the key ADC parameters measured at 25°C and VDD_PADS at 3.0 V,<br />
for a sampling rate of 6 MHz. ADC_HVSELP and ADC_HVSELN are programmed to 0 to<br />
disable the input buffer. The single-ended measurements were done at f input = 7.7% f Nyquist ;<br />
0 dBFS level (where full-scale is a 1.2 V p-p swing). The differential measurements were<br />
done at f input = 7.7% f Nyquist ; -6 dBFS level (where full-scale is a 2.4 V p-p swing) and a<br />
common mode voltage of 0.6 V.<br />
Table 142.<br />
ADC module key parameters for input buffer disabled<br />
and 6 MHz sampling (1)<br />
Parameter<br />
Performance<br />
ADC_PERIOD 0 1 2 3 4 5 6 7<br />
Conversion Time (µs) 5.33 10.7 21.3 42.7 85.3 171 341 683<br />
Nyquist Freq (kHz) 93.8 46.9 23.4 11.7 5.86 2.93 1.47 0.732<br />
3 dB Cut-off (kHz) 56.6 28.3 14.1 7.07 3.54 1.77 0.884 0.442<br />
INL (codes peak) 0.084 0.084 0.15 0.274 0.518 1.057 2.106 4.174<br />
INL (codes RMS) 0.046 0.044 0.076 0.147 0.292 0.58 1.14 2.352<br />
DNL (codes peak) 0.026 0.023 0.044 0.052 0.096 0.119 0.196 0.371<br />
DNL (codes RMS) 0.007 0.009 0.013 0.015 0.024 0.03 0.05 0.082<br />
ENOB (from single-cycle test) 5.6 7.0 8.5 10.0 11.4 12.6 13.1 13.2<br />
SNR (dB)<br />
Single-Ended<br />
Differential<br />
35<br />
35<br />
44<br />
44<br />
53<br />
53<br />
62<br />
62<br />
70<br />
71<br />
75<br />
77<br />
76<br />
79<br />
77<br />
80<br />
SINAD (dB)<br />
Single-Ended<br />
Differential<br />
35<br />
35<br />
44<br />
44<br />
53<br />
53<br />
62<br />
62<br />
68<br />
70<br />
71<br />
75<br />
71<br />
77<br />
71<br />
77<br />
195/215 Doc ID 018587 Rev 2
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