參數(shù)資料
型號： EVAL-AD7738EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 12/28頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7738
標準包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 15.4k
數(shù)據(jù)接口： 串行
輸入范圍： ±2.5 V
在以下條件下的電源（標準）： 85mW @ 5V
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7738
已供物品： 板
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REV. 0
–2–
AD7738–SPECIFICATIONS
Parameter
Min
Typ
Max
Unit
Test Conditions/Comment
ADC PERFORMANCE—
CHOPPING ENABLED
Conversion Time Rate
372
12190
Hz
Configure via Conversion Time Register
No Missing Codes
1
24
Bits
FW
≥ 6 (Conversion Time ≥ 165 s)
See Typical Performance Characteristics
Output Noise
See Table I
Resolution
See Tables II and III
Integral Nonlinearity (INL)
±0.0015
% of FSR
AIN Range =
±2.5 V
±0.0015
% of FSR
AIN Range =
±1.25 V
Offset Error (Unipolar, Bipolar)
2
±10
V
Before Calibration
Offset Drift vs. Temperature
1
±280
nV/
°C
Gain Error
2
±0.2
%
Before Calibration
Gain Drift vs. Temperature
1
±2.5
ppm of FS/ C
Positive Full-Scale Error
2
±0.2
% of FSR
Before Calibration
Positive Full-Scale Drift vs. Temperature
1
±2.5
ppm of FS/ C
Bipolar Negative Full-Scale Error
3
±0.0030
% of FSR
After Calibration
3
Common-Mode Rejection
80
100
dB
At DC, AIN = 1 V
Power Supply Rejection
70
80
dB
At DC, AIN = 1 V
ADC PERFORMANCE—
CHOPPING DISABLED
Conversion Time Rate
737
15437
Hz
Configure via Conversion Time Register
No Missing Codes
1
24
Bits
FW
≥ 8 (Conversion Time ≥ 117 s)
See Typical Perfomance Charateristics
Output Noise
See Table IV
Resolution
See Tables V and VI
Integral Nonlinearity (INL)
±0.0015
% of FSR
Offset Error (Unipolar, Bipolar)
4
± 1mV
Before Calibration
Offset Drift vs. Temperature
±1.5
V/ C
Gain Error
2
±0.2
%
Before Calibration
Gain Drift vs. Temperature
±2.5
ppm of FS/ C
Positive Full-Scale Error
2
±0.2
% of FSR
Before Calibration
Positive Full-Scale Drift vs. Temperature
±2.5
ppm of FS/ C
Bipolar Negative Full-Scale Error
3
±0.0030
% of FSR
After Calibration
3
Common-Mode Rejection
75
dB
At DC, AIN = 1 V
Power Supply Rejection
65
dB
At DC, AIN = 1 V
ANALOG INPUTS
Analog Input Voltage Ranges
1, 5
±2.5 V Range
–2.9
±2.5
+2.9
V
+2.5 V Range
0
0 to 2.5
2.9
V
±1.25 V Range
–1.45
±1.25
+1.45
V
+1.25 V Range
0
0 to 1.25 1.45
V
±0.625 V Range
–725
±625
+725
mV
+0.625 V Range
0
0 to 625
725
mV
AIN, AINCOM Common-Mode Voltage
1
0.2
AVDD – 0.3 V
AIN, AINCOM Input Current
6
200
nA
Only One Channel, Chop Disabled
AIN to MUXOUT On Resistance
1
200
REFERENCE INPUT
REFIN(+) to REFIN(–) Voltage
1, 7
2.475
2.5
2.525
V
NOREF Trigger Voltage
0.5
V
NOREF Bit in Channel Status Register
REFIN(+), REFIN(–)
Common-Mode Voltage
1
0AVDD
V
Reference Input Current
8
400
A
SYSTEM CALIBRATION1, 9
Full Scale Calibration Limit
+1.05
FS V
Zero Scale Calibration Limit
–1.05
FS
V
Input Span
0.8
FS
2.1
FS
V
(–40 C to +105 C, AVDD = 5 V
5%, DVDD = 2.7 V to 3.6 V or 5 V
5%,
REFIN(+) = 2.5 V, REFIN(–) = 0 V, AINCOM = 2.5 V, MUXOUT(+) = ADCIN(+), MUXOUT(–) = ADCIN(–), Internal Buffer ON, AIN Range =
1.25 V,
fMCLK = 6.144 MHz; unless otherwise noted.)
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