aduc831bcp-reel Analog Devices, Inc., aduc831bcp-reel Datasheet - Page 11

• Manufacturer Part Number: aduc831bcp-reel
• Description: Microconverter, 12-bit Adcs And Dacs With Embedded 62 Kbytes Flash Mcu
• Manufacturer: Analog Devices, Inc.

The typical performance plots presented in this section illustrate
typical performance of the ADuC831 under various operating
conditions.
TPC 1 and TPC 2 below 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 and the
typically worst-case errors in both plots is just less than 0.3 LSBs.
TPC 3 and TPC 4 below show the variation in Worst Case
Positive (WCP) INL and Worst Case Negative (WCN) INL
versus external reference input voltage.
TPC 5 and TPC 6 show typical ADC differential nonlinearity
(DNL) errors from ADC code 0 to code 4095 at 5 V and 3 V sup-
plies, respectively. The ADC is using its internal reference (2. V) and
operating at a sampling rate of 152 kHz and the typically worst case
errors in both plots is just less than 0.2 LSBs.
TPC 7 and TPC 8 show the variation in worst case positive
(WCP) DNL and worst-case negative (WCN) DNL versus
external reference input voltage.
TPC 9 shows a histogram plot of 10,000 ADC conversion
results on a dc input with V
excellent code distribution pointing to the low noise perfor-
mance of the on-chip precision ADC.
REV. 0
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–0.8
–1.0
0.8
0.4
1.0
0.8
0.6
0.4
0.2
1.0
0.6
0.2
0
0
0
0
TPC 1. Typical INL Error, V
TPC 2. Typical INL Error, V
511
511
1023
1023
1535
1535
DD
ADC CODES
ADC CODES
= 5 V. The plot illustrates an
2047
2047
2559
2559
AV
f
S
DD
DD
AV
f
3071
= 152kHz
3071
DD
S
= 5 V
= 3 V
= 152kHz
DD
/ DV
/DV
DD
3583
3583
DD
= 5V
Typical Performance Characteristics–ADuC831
= 3V
4095
4095
–11–
TPC 10 shows a histogram plot of 10,000 ADC conversion
results on a dc input for V
very tight code distribution of 1 LSB with the majority of codes
appearing in one output bin.
TPC 11 and TPC 12 show typical FFT plots for the ADuC831.
These plots were generated using an external clock input. The
ADC is using its internal reference (2.5 V) sampling a full-scale,
10 kHz sine wave test tone input at a sampling rate of 149.79 kHz.
The resultant FFTs shown at 5 V and 3 V supplies illustrate an
excellent 100 dB noise floor, 71 dB Signal-to-Noise Ratio (SNR)
and THD greater than –80 dB.
TPC 13 and TPC 14 show typical dynamic performance versus
external reference voltages. Again excellent ac performance can
be observed in both plots with some roll-off being observed as
V
TPC 15 shows typical dynamic performance versus sampling
frequency. SNR levels of 71 dBs are obtained across the sam-
pling range of the ADuC831.
TPC 16 shows the voltage output of the on-chip temperature
sensor versus temperature. Although the initial voltage output at
25ºC can vary from part to part, the resulting slope of
–2 mV/ºC is constant across all parts.
REF
TPC 4. Typical Worst Case INL Error vs. V
TPC 3. Typical Worst Case INL Error vs. V
falls below 1 V.
–0.2
–0.4
–0.6
–0.2
–0.4
–0.6
–0.8
1.2
1.0
0.8
0.6
0.4
0.2
0.8
0.6
0.4
0.2
0
0
0.5
0.5
1.0
1.0
EXTERNAL REFERENCE – V
EXTERNAL REFERENCE – V
DD
1.5
1.5
= 3 V. The plot again illustrates a
2.0
2.0
WCN INL
WCN INL
2.5
2.5
WCP INL
AV
WCP INL
f
AV
f
S
S
= 152kHz
DD
= 152kHz
DD
/DV
/DV
5.0
3.0
DD
REF,
DD
REF,
= 5V
= 3V
V
V
DD
DD
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
0.8
0.6
0.4
0.2
–0.2
–0.4
–0.6
–0.8
0
= 3 V
= 5 V