EVAL-ADUC834QS Analog Devices Inc, EVAL-ADUC834QS Datasheet - Page 22

• Manufacturer Part Number: EVAL-ADUC834QS
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADUC834QS

• Lead Free Status / RoHS Status: Not Compliant

ADuC834
PRIMARY AND AUXILIARY ADC NOISE
PERFORMANCE
Tables X, XI, and XII show the output rms noise in V and
output peak-to-peak resolution in bits (rounded to the nearest
0.5 LSB) for some typical output update rates on both the primary
and auxiliary ADCs. The numbers are typical and are generated
at a differential input voltage of 0 V. The output update rate is
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
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
Peak-to-Peak Resolution vs. Input Range and Update Rate; Peak-to-Peak Resolution in Bits
Output RMS Noise in V
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
16.2
16.7
20 mV
20 mV
20 mV
Table X. Primary ADC, Typical Output RMS Noise ( V)
Table XI. Primary ADC, Peak-to-Peak Resolution (Bits)
1.50
0.65
0.35
13
14
15
15.7
16.7
17.7
Input Range
2.5 V
10.75
2.00
1.15
40 mV
40 mV
40 mV
Table XII. Auxiliary ADC
1.60
0.65
0.37
14
15
16
16.7
17.7
18.7
80 mV
80 mV
80 mV
–22–
selected via the Sinc Filter (SF) SFR. It is important to note
that the peak-to-peak resolution figures represent the resolution
for which there will be no code flicker within a six-sigma limit.
The QuickStart Development system PC software comes
complete with an ADC noise evaluation tool. This tool can be
easily used with the evaluation board to see these figures from
silicon.
Input Range
1.75
0.65
0.37
Input Range
15
16
17
Input Range
17.7
18.7
19.7
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 Resolution in Bits
3.50
0.65
0.37
15
17
18
17.7
19.7
20.7
320 mV
320 mV
320 mV
Data Update
Rate (Hz)
105.3
19.79
5.35
4.50
0.95
0.51
15.5
17.5
18.5
18.2
20.2
21.2
640 mV
640 mV
640 mV
6.70
1.40
0.82
16
18
19
18.7
20.7
21.7
16
16
16
Input Range
2.5 V
1.28 V
1.28 V
1.28 V
2
1
16
18.5
19.5
18.7
21.2
22.2
REV. A
11.75
2.30
1.25
2.56 V
2.56 V
2.56 V