AVDD = 2.7 V to 5.25 V; DV
參數(shù)資料
型號： EVAL-AD7785EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 23/32頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7785
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 20
采樣率（每秒）： 470
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7785
已供物品： 板，纜線，CD
相關(guān)產(chǎn)品： AD7785BRUZ-REEL-ND - IC ADC 20BIT 3CH LN LP 16-TSSOP
AD7785BRUZ-ND - IC ADC 20BIT SIGMA-DELTA 16TSSOP
AD7785
Rev. 0 | Page 3 of 32
SPECIFICATIONS
AVDD = 2.7 V to 5.25 V; DVDD = 2.7 V to 5.25 V; GND = 0 V; all specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
Unit
Test Conditions/Comments
ADC CHANNEL
Output Update Rate
4.17 to 470
Hz nom
No Missing Codes2
20
Bits min
Resolution
Output Noise and Update Rates
Integral Nonlinearity
±15
ppm of FSR max
Offset Error3
±1
μV typ
Offset Error Drift vs. Temperature4
±10
nV/°C typ
Full-Scale Error3, 5
±10
μV typ
Gain Drift vs. Temperature4
±1
ppm/°C typ
Gain = 1 to 16, external reference
±3
ppm/°C typ
Gain = 32 to 128, external reference
Power Supply Rejection
100
dB min
AIN = 1 V/gain, gain ≥ 4, external reference
ANALOG INPUTS
Differential Input Voltage Ranges
±VREF/Gain
V nom
VREF = REFIN(+)
REFIN() or internal reference,
gain = 1 to 128
Absolute AIN Voltage Limits2
Unbuffered Mode
GND – 30 mV
V min
Gain = 1 or 2
AVDD + 30 mV
V max
Buffered Mode
GND + 100 mV
V min
Gain = 1 or 2
AVDD – 100 mV
V max
In-Amp Active
GND + 300 mV
V min
Gain = 4 to 128
AVDD – 1.1
V max
Common-Mode Voltage, VCM
0.5
V min
VCM = (AIN(+) + AIN(
))/2, gain = 4 to 128
Analog Input Current
Buffered Mode or In-Amp Active
Average Input Current2
±1
nA max
Gain = 1 or 2, update rate < 100 Hz
±250
pA max
Gain = 4 to 128, update rate < 100 Hz
Average Input Current Drift
±2
pA/°C typ
Unbuffered Mode
Gain = 1 or 2
Average Input Current
±400
nA/V typ
Input current varies with input voltage
Average Input Current Drift
±50
pA/V/°C typ
Normal Mode Rejection2
Internal Clock
@ 50 Hz, 60 Hz
65
dB min
80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
External Clock
@ 50 Hz, 60 Hz
80
dB min
90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz
94
dB min
100 dB typ, 50 ± 1 Hz, FS[3:0] = 10016
@ 60 Hz
90
dB min
100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006
Common-Mode Rejection
@ DC
100
dB min
AIN = 1 V/gain, gain ≥ 4
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106
@ 50 Hz, 60 Hz2
100
dB min
50 ± 1 Hz (FS[3:0] = 1001)6, 60 ± 1 Hz
(FS[3:0] = 1000)6
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