參數(shù)資料
型號： AD7738BRU
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 8-Channel, High Throughput,
中文描述： 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝： MO-153AE, TSSOP-28
文件頁數(shù)： 10/28頁
文件大小： 407K
代理商： AD7738BRU
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
Time
Register
Conversion
Time
( s)
Output
Data Rate
(Hz)
–3 dB
Frequency
(Hz)
Input Range
FW
2.5 V, +2.5 V
1.25 V, +1.25 V, 625 mV, +625 mV
127
92
35
16
9
8
3
7Fh
5Ch
23h
10h
9h
8h
3h
1357
992
398
200
127
117
65
737
1008
2511
4991
7847
8545
15398
671
917
2285
2510
7141
7776
14013
2.7
3.0
5.1
7.5
10.2
11.4
15.5
1.5
1.8
3.0
4.5
5.9
6.5
10.3
Table V. Typical RMS Resolution in Bits vs. Conversion Time and Input Range with
Chopping Disabled
Conversion
Time
Register
Conversion
Time
( s)
Output
Data Rate
(Hz)
–3 dB
Frequency
(Hz)
Input Range
FW
2.5 V
+2.5 V
1.25 V
+1.25 V
625 mV
+625 mV
127
92
35
16
9
8
3
7Fh
5Ch
23h
10h
9h
8h
3h
1357
992
398
200
127
117
65
737
1008
2511
4991
7847
8545
15398
671
917
2285
2510
7141
7776
14013
20.8
20.6
19.9
19.3
18.9
18.7
18.0
19.8
19.6
18.9
18.3
17.9
17.7
16.7
20.6
20.4
19.6
19.0
18.7
18.5
17.8
19.6
19.4
18.6
18.0
17.7
17.5
17.1
19.6
19.4
18.6
18.0
17.7
17.5
17.1
18.6
18.4
17.6
17.0
16.7
16.5
16.1
Table VI. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with
Chopping Disabled
Conversion
Time
Register
Conversion
Time
( s)
Output
Data Rate
(Hz)
–3 dB
Frequency
(Hz)
Input Range
FW
2.5 V
+2.5 V
1.25 V
+1.25 V
625 mV
+625 mV
127
92
35
16
9
8
3
7Fh
5Ch
23h
10h
9h
8h
3h
1357
992
398
200
127
117
65
737
1008
2511
4991
7847
8545
15398
671
917
2285
2510
7141
7776
14013
17.9
17.8
17.0
16.3
16.1
16.0
15.0
16.9
16.8
16.0
15.3
15.1
15.0
14.0
17.8
17.4
16.8
16.2
15.9
15.7
14.8
16.8
16.4
15.8
15.2
14.9
14.7
13.8
16.8
16.4
15.8
15.2
14.9
14.7
13.8
15.8
15.4
14.8
14.2
13.9
13.7
12.8
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