EVAL-ADUC836QS AD [Analog Devices], EVAL-ADUC836QS Datasheet - Page 22

• Manufacturer Part Number: EVAL-ADUC836QS
• Description: MicroConverter, Dual 16-Bit ADCs with Embedded 62 kB Flash MCU
• Manufacturer: AD [Analog Devices]

PRIMARY AND AUXILIARY ADC NOISE PERFORMANCE
Tables X, XI, and XII show the output rms noise in mV and output
peak-to-peak resolution in bits (rounded to the nearest 0.5 LSB)
for some typical output update rates on both the pri ma ry and
auxiliary ADCs. The numbers are typical and are generated at a
differential input voltage of 0 V. The output up date rate is selected
SF
Word
13
69
255
SF
Word
13
69
255
SF
Word
13
69
255
*Based on a six-sigma limit, the rms resolution is 2.7 bits greater than the peak-to-peak resolution.
SF
Word
13
69
255
*ADC converting in Bipolar mode
ADuC836
Typical Output RMS Noise vs. Update Rate*
Data Update
Rate (Hz)
105.3
19.79
5.35
Data Update
Rate (Hz)
105.3
19.79
5.35
Data Update
Rate (Hz)
105.3
19.79
5.35
Output RMS Noise in V
Peak-to-Peak Resolution vs. Input Range and Update Rate; Peak-to-Peak Resolution in Bits
Data
R
105.3
19.79
5.35
Typical Output RMS Noise vs. Input Range and Update Rate; Output RMS Noise in V
ate (Hz)
Typical RMS Resolution vs. Input Range and Update Rate: RMS Resolution in Bits*
Update
1.50
0.60
0.35
12
13.5
14
14.7
16
16
20 mV
20 mV
20 mV
Table XI. Primary ADC, Peak-to-Peak Resolution (Bits)
Table X. Primary ADC, Typical Output RMS Noise ( V)
1.50
0.65
0.35
13
14
15
15.7
16
16
Input Range
2.5 V
10.75
2.00
1.15
40 mV
40 mV
40 mV
Table XII. Auxiliary ADC
0.37
1.60
0.65
14
15
16
16
16
16
80 mV
80 mV
80 mV
–22–
via the Sinc Filter (SF) SFR. It is im por tant to note that the
peak-to-peak resolution fi gures represent the resolution for which
there will be no code fl icker within a six-sigma limit.
The QuickStart Development system PC software comes com-
plete with an ADC noise evaluation tool. This tool can be easily
used with the evaluation board to see these fi gures from silicon.
Input Range
1.75
0.65
0.37
Input Range
15
16
16
Input Range
16
16
16
SF
Word
13
69
255
NOTES
1
2
ADC converting in Bipolar mode
In Unipolar mode, peak-to-peak resolution at 105 Hz is 15 bits.
160 mV
160 mV
160 mV
Peak-to-Peak Resolution vs. Update Rate
Peak-to-Peak Res o lu tion in Bits
3.50
0.65
0.37
15
16
16
16
16
16
320 mV
320 mV
320 mV
Data Update
Rate (Hz)
105.3
19.79
5.35
4.50
0.95
0.51
15.5
16
16
16
16
16
640 mV
640 mV
640 mV
6.70
1.40
0.82
16
16
16
16
16
16
1.28 V
Input Range
2.5 V
16
16
16
1.28 V
1.28 V
2
1
11.75
2.30
1.25
16
16
16
16
16
16
2.56 V
REV. 0
2.56 V
2.56 V