Datasheet
ADuC814
Rev. A | Page 13 of 72
TYPICAL PERFORMANCE CURVES
The typical performance plots presented in this section
illustrate typical performance of the ADuC814 under various
operating conditions. Note that all typical plots in this section
were generated using the ADuC814BRU, i.e., the B-grade part.
Figure 3 and Figure 4 show typical ADC integral nonlinearity
(INL) errors from ADC Code 0 to Code 4095 at 5 V and 3 V
supplies, respectively. The ADC is using its internal reference
(2.5 V) and operating at a sampling rate of 152 kHz. The typical
worst-case errors in both plots are just less than 0.3 LSBs.
ADC CODES
LSBs
0
–0.4
–0.3
–0.2
–0.1
0
0.1
0.4
0.3
0.2
1023511 35833071255920471535 4095
02748-A-010
AV
DD
/DV
DD
= 5V
f
S
= 152kHz
Figure 3. Typical INL Error, V
DD
= 5 V
ADC CODES
LSBs
0
–0.4
–0.3
–0.2
–0.1
0
0.1
0.4
0.3
0.2
1023511 35833071255920471535 4095
02748-A-011
AV
DD
/DV
DD
= 3V
f
S
= 152kHz
Figure 4. Typical INL Error, V
DD
= 3 V
Figure 5 and Figure 6 show the variation in worst-case positive
(WCP) INL and worst-case negative (WCN) INL versus
external reference input voltage.
EXTERNAL REFERENCE (V)
1.2
WCP–INL (LSBs)
0.8
0.4
0
–0.4
–0.6
1.0
0.6
0.2
–0.2
AV
DD
/DV
DD
= 5V
f
S
= 152kHz
0.5 1.0 1.5 2.0 2.5 5.0
0.6
0.4
0
–0.4
–0.6
0.2
–0.2
WCN–INL (LSBs)
WCN INL
WCP INL
02748-A-012
Figure 5. Typical Worst-Case INL Error vs. V
REF
, V
DD
= 5 V
EXTERNAL REFERENCE (V)
WCP–INL (LSBs)
0.8
0.4
0
–0.4
–0.8
0.6
0.2
–0.2
AV
DD
/DV
DD
= 3V
f
S
= 152kHz
0.5 1.5 2.5
WCN–INL (LSBs)
–0.6
0.8
0.4
0
–0.4
–0.8
0.6
0.2
–0.2
–0.6
3.02.01.0
WCN INL
WCP INL
02748-A-013
Figure 6. Typical Worst-Case INL Error vs. V
REF
, V
DD
= 3 V
Figure 7 and Figure 8 show typical ADC differential nonlinearity
(DNL) errors from ADC Code 0 to Code 4095 at 5 V and 3 V
supplies, respectively. The ADC is using its internal reference
(2.5 V) and operating at a sampling rate of 152 kHz. The typical
worst-case errors in both plots are just less than 0.2 LSBs.