AVDD = 2.7 V to 5.25 V, V
參數(shù)資料
型號: AD7781BRZ
廠商: Analog Devices Inc
文件頁數(shù): 10/16頁
文件大小: 0K
描述: IC ADC 20BIT 1CH LP SD 14SOIC
產(chǎn)品培訓(xùn)模塊: Weigh Scale Introduction
設(shè)計資源: Weigh Scale Design Using AD7781 with Internal PGA (CN0108)
標(biāo)準(zhǔn)包裝: 56
位數(shù): 20
采樣率(每秒): 16.7
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 14-SO
包裝: 管件
輸入數(shù)目和類型: 1 個差分,雙極
產(chǎn)品目錄頁面: 779 (CN2011-ZH PDF)
AD7781
Rev. 0 | Page 3 of 16
SPECIFICATIONS
AVDD = 2.7 V to 5.25 V, VREF = AVDD, DVDD = 2.7 V to 5.25 V, GND = 0 V, all specifications TMIN to TMAX, unless otherwise noted.1
Table 2.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
ADC CHANNEL
Output Update Rate (fADC)
10
Hz
FILTER = 1, settling time = 3/fADC
16.7
Hz
FILTER = 0, settling time = 2/fADC
No Missing Codes2
20
Bits
Resolution, Peak-to-Peak
RMS Noise
Integral Nonlinearity
±6
ppm FSR
Offset Error
±6
μV
Gain = 128 with FILTER = 1
±200
μV
Gain = 1 with FILTER = 1
±1
μV
Gain = 128 with FILTER = 0
±10
μV
Gain = 1 with FILTER = 0
Offset Error Drift vs. Temperature
±10
nV/°C
Gain = 128
±150
nV/°C
Gain = 1 with FILTER = 1
±10
nV/°C
Gain = 1 with FILTER = 0
Full-Scale Error
±0.25
% of FS
Gain Drift vs. Temperature
±2
ppm/°C
Power Supply Rejection
100
dB
Gain = 128, FILTER = 1, AIN = 7.81 mV
120
dB
Gain = 128, FILTER = 0, AIN = 7.81 mV
Normal Mode Rejection2
50 Hz, 60 Hz
63
75
dB
50 Hz ± 1 Hz, 60 Hz ± 1 Hz, fADC = 16.7 Hz
72
90
dB
50 Hz ± 1 Hz, 60 Hz ± 1 Hz, fADC = 10 Hz
Common-Mode Rejection
DC
90
dB
Gain = 1, AIN = 1 V
90
dB
Gain = 128, AIN = 7.81 mV
50 Hz, 60 Hz
110
dB
50 Hz ± 1 Hz, 60 Hz ± 1 Hz
ANALOG INPUTS
Differential Input Voltage Range
±VREF/gain
V
VREF = REFIN(+) REFIN(),
gain = 1 or 128
Absolute AIN Voltage Limits2
GND + 100 mV
AVDD 100 mV
V
Gain = 1
GND + 450 mV
AVDD 1.1
V
Gain = 128, FILTER = 0
GND + 1.1
AVDD 1.1
V
Gain = 128, FILTER = 1, AVDD ≤ 3.6 V
GND + 1.5
AVDD 1.5
V
Gain = 128, FILTER = 1, AVDD > 3.6 V
Average Input Current
±1
nA
Gain = 1
±250
pA
Gain = 128
Average Input Current Drift
±3
pA/°C
REFERENCE
External REFIN Voltage
AVDD
V
REFIN = REFIN(+) REFIN()
Reference Voltage Range2
0.5
AVDD
V
Absolute REFIN Voltage Limits2
GND 30 mV
AVDD + 30 mV
V
Average Reference Input Current
400
nA/V
Average Reference Input Current
Drift
±0.15
nA/V/°C
Normal Mode Rejection
Same as for analog inputs
Common-Mode Rejection
110
dB
BRIDGE POWER-DOWN SWITCH
(BPDSW)
Controlled via the PDRST pin
RON
9
Ω
Allowable Current2
30
mA
Continuous current
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