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AD7798 Folha de dados(PDF) 4 Page - Analog Devices

Nome de Peças AD7798
Descrição Electrónicos  Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD7798 Folha de dados(HTML) 4 Page - Analog Devices

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AD7798/AD7799
Data Sheet
Rev. B | Page 4 of 28
Parameter
AD7798B/AD7799B1
Unit
Test Conditions/Comments
REFERENCE
External REFIN Voltage
2.5
V nom
REFIN = REFIN(+) − REFIN(−)
Reference Voltage Range2
0.1
V min
AVDD
V max
When VREF = AVDD, the differential input must be
limited to (0.9 x VREF/gain) if the in-amp is active.
Absolute REFIN Voltage Limits2
GND − 30 mV
V min
AVDD + 30 mV
V max
Average Reference Input Current
400
nA/V typ
Average Reference Input Current Drift
±0.03
nA/V/°C typ
Normal Mode Rejection
Same as for analog
inputs
Common-Mode Rejection
100
dB typ
Reference Detect Levels
0.3
V min
0.65
V max
NOXREF bit active if VREF < 0.3 V
LOW-SIDE POWER SWITCH
RON
7
Ω max
AVDD = 5 V
9
Ω max
AVDD = 3 V
Allowable Current2
30
mA max
Continuous current
DIGITAL OUTPUTS (P1 and P2)
Output High Voltage, VOH2
AVDD − 0.6
V min
AVDD = 3 V, ISOURCE = 100 µA
Output Low Voltage, VOL2
0.4
V max
AVDD = 3 V, ISINK = 100 µA
Output High Voltage, VOH2
4
V min
AVDD = 5 V, ISOURCE = 200 µA
Output Low Voltage, VOL2
0.4
V max
AVDD = 5 V, ISINK = 800 µA
INTERNAL CLOCK
Frequency2
64 ± 3%
kHz min/max
LOGIC INPUTS
CS2
Input Low Voltage, VINL
0.8
V max
DVDD = 5 V
Input High Voltage, VINH
0.4
2.0
V max
V min
DVDD = 3 V
DVDD = 3 V or 5 V
SCLK and DIN
(Schmitt-Triggered Input)2
VT(+)
1.4/2
V min/max
DVDD = 5 V
VT(–)
0.8/1.7
V min/max
DVDD = 5 V
VT(+) – VT(–)
0.1/0.17
V min/max
DVDD = 5 V
VT(+)
0.9/2
V min/max
DVDD = 3 V
VT(–)
0.4/1.35
V min/max
DVDD = 3 V
VT(+) − VT(–)
0.06/0.13
V min/max
DVDD = 3 V
Input Currents
±10
µA max
VIN = DVDD or GND
Input Capacitance
10
pF typ
All digital inputs
LOGIC OUTPUTS
Output High Voltage, VOH2
DVDD − 0.6
V min
DVDD = 3 V, ISOURCE = 100 µA
Output Low Voltage, VOL2
0.4
V max
DVDD = 3 V, ISINK = 100 µA
Output High Voltage, VOH2
4
V min
DVDD = 5 V, ISOURCE = 200 µA
Output Low Voltage, VOL2
0.4
V max
DVDD = 5 V, ISINK = 1.6 mA
Floating-State Leakage Current
±10
µA max
Floating-State Output Capacitance
10
pF typ
Data Output Coding
Offset binary


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