參數(shù)資料
型號(hào)： AD7738
廠商： Analog Devices, Inc.
英文描述： 8-Channel, High Throughput,
中文描述： 8通道，高通量，
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 407K
代理商： AD7738
REV. 0
AD7738
–9–
OUTPUT NOISE AND RESOLUTION SPECIFICATION
The AD7738 can be operated with chopping enabled or disabled, allowing the ADC to be programmed either to optimize the
throughput rate and channel switching time or to optimize offset drift performance. Noise tables for these two primary modes of
operation are outlined below for a selection of output rates and settling times.
CHOPPING ENABLED
The first mode, in which the AD7738 is configured with chopping enabled (CHOP = 1), provides very low noise numbers with lower
output rates. Tables I to III show the –3 dB frequencies and typical performance versus channel conversion time or equivalent output
data rate, respectively. Table I shows the typical output rms noise. Table II shows the typical effective resolution based on the rms
noise. Table III 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 I. Typical Output RMS Noise in V vs. Conversion Time and Input Range with
Chopping Enabled
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
46
17
8
4
2
FFh
AEh
91h
88h
84h
82h
2686
999
395
207
124
82
372
1001
2534
4826
8074
12166
194
521
1317
2510
4198
6326
1.8
3.0
5.1
8.1
9.3
17.0
1.1
1.8
3.0
4.5
5.3
10.6
Table II. Typical Effective Resolution in Bits vs. Conversion Time and Input Range with
Chopping Enabled
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
46
17
8
4
2
FFh
AEh
91h
88h
84h
82h
2686
999
395
207
124
82
372
1001
2534
4826
8074
12166
194
521
1317
2510
4198
6326
21.4
20.6
19.9
19.2
19.0
18.1
20.4
19.6
18.9
18.2
18.0
17.1
21.1
20.4
19.6
19.0
18.8
17.8
20.1
19.4
18.6
18.0
17.8
16.8
20.1
19.4
18.6
18.0
17.8
16.8
19.1
18.4
17.6
17.0
16.8
15.8
Table III. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with
Chopping Enabled
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
46
17
8
4
2
FFh
AEh
91h
88h
84h
82h
2686
999
395
207
124
82
372
1001
2534
4826
8074
12166
194
521
1317
2510
4198
6326
18.4
17.8
16.8
16.5
16.0
15.0
17.4
16.8
15.8
15.5
15.0
14.0
18.2
17.5
16.7
16.2
16.0
15.0
17.2
16.5
15.7
15.2
15.0
14.0
17.2
16.5
15.7
15.2
15.0
14.0
16.2
15.5
14.7
14.2
14.0
13.0
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