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