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AD7738 Datasheet(PDF) 10 Page - Analog Devices

Part # AD7738
Description  8-Channel, High Throughput, 24-Bit ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7738 Datasheet(HTML) 10 Page - Analog Devices

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REV. 0
–10–
AD7738
CHOPPING DISABLED
The second mode, in which the AD7738 is configured with chopping disabled (CHOP = 0), provides faster conversion time while still
maintaining high resolution. Tables IV to VI show the –3 dB frequencies and typical performance versus channel conversion time or
equivalent output data rate, respectively. Table IV shows the typical output rms noise. Table V shows the typical effective resolution
based on the rms noise. Table VI shows the typical output peak-to-peak resolution, representing values for which there will be no code
flicker within a six-sigma limit. The peak-to-peak resolutions are not calculated based on rms noise, but on peak-to-peak noise.
These typical numbers are generated from 4096 data samples acquired in Continuous Conversion mode with an analog input voltage
set to 0 V and MCLK = 6.144 MHz. The Conversion Time is selected via the Channel Conversion Time register.
Table IV. Typical Output RMS Noise in
V vs. Conversion Time and Input Range with
Chopping Disabled
Conversion
Conversion
Output
–3 dB
Input Range
Time
Time
Data Rate
Frequency
FW
Register
( s)
(Hz)
(Hz)
2.5 V, +2.5 V
1.25 V, +1.25 V,
625 mV, +625 mV
127
7Fh
1357
737
671
2.7
1.5
92
5Ch
992
1008
917
3.0
1.8
35
23h
398
2511
2285
5.1
3.0
16
10h200
4991
2510
7.5
4.5
99h127
7847
7141
10.2
5.9
88h
117
8545
7776
11.4
6.5
33h65
15398
14013
15.5
10.3
Table V. Typical RMS Resolution in Bits vs. Conversion Time and Input Range with
Chopping Disabled
Conversion
Conversion
Output
–3 dB
Input Range
Time
Time
Data Rate
Frequency
FW
Register
( s)
(Hz)
(Hz)
2.5 V
+2.5 V
1.25 V
+1.25 V
625 mV
+625 mV
127
7Fh
1357
737
671
20.8
19.8
20.6
19.6
19.6
18.6
92
5Ch
992
1008
917
20.6
19.6
20.4
19.4
19.4
18.4
35
23h
398
2511
2285
19.9
18.9
19.6
18.6
18.6
17.6
16
10h200
4991
2510
19.3
18.3
19.0
18.0
18.0
17.0
99h127
7847
7141
18.9
17.9
18.7
17.7
17.7
16.7
88h
117
8545
7776
18.7
17.7
18.5
17.5
17.5
16.5
33h65
15398
14013
18.0
16.7
17.8
17.1
17.1
16.1
Table VI. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with
Chopping Disabled
Conversion
Conversion
Output
–3 dB
Input Range
Time
Time
Data Rate
Frequency
FW
Register
( s)
(Hz)
(Hz)
2.5 V
+2.5 V
1.25 V
+1.25 V
625 mV
+625 mV
127
7Fh
1357
737
671
17.9
16.9
17.8
16.8
16.8
15.8
92
5Ch
992
1008
917
17.8
16.8
17.4
16.4
16.4
15.4
35
23h
398
2511
2285
17.0
16.0
16.8
15.8
15.8
14.8
16
10h200
4991
2510
16.3
15.3
16.2
15.2
15.2
14.2
99h127
7847
7141
16.1
15.1
15.9
14.9
14.9
13.9
88h
117
8545
7776
16.0
15.0
15.7
14.7
14.7
13.7
33h65
15398
14013
15.0
14.0
14.8
13.8
13.8
12.8


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