AD7798/AD7799
Parameter
REFERENCE
External REFIN Voltage
Reference Voltage Range
AD7798B/AD7799B
2.5
0.1
AV
DD
GND − 30 mV
AV
DD
+ 30 mV
400
±0.03
Same as for analog
inputs
100
0.3
0.65
7
9
30
AV
DD
− 0.6
0.4
4
0.4
64 ± 3%
Unit
V nom
V min
V max
V min
V max
nA/V typ
nA/V/°C typ
Test Conditions/Comments
REFIN = REFIN(+) − REFIN(−)
Data Sheet
When V
REF
= AV
DD
, the differential input must be
limited to (0.9 x V
REF
/gain) if the in-amp is active.
Absolute REFIN Voltage Limits
Average Reference Input Current
Average Reference Input Current Drift
Normal Mode Rejection
Common-Mode Rejection
Reference Detect Levels
LOW-SIDE POWER SWITCH
R
ON
Allowable Current
DIGITAL OUTPUTS (P1 and P2)
Output High Voltage, V
OH2
Output Low Voltage, V
Output High Voltage, V
OH2
Output Low Voltage, V
INTERNAL CLOCK
Frequency
LOGIC INPUTS
CS
Input Low Voltage, V
INL
Input High Voltage, V
INH
SCLK and DIN
(Schmitt-Triggered Input)
V
T
(+)
V
T
(–)
V
T
(+) – V
T
(–)
V
T
(+)
V
T
(–)
V
T
(+) − V
T
(–)
Input Currents
Input Capacitance
LOGIC OUTPUTS
Output High Voltage, V
OH2
Output Low Voltage, V
Output High Voltage, V
OH2
Output Low Voltage, V
Floating-State Leakage Current
Floating-State Output Capacitance
Data Output Coding
dB typ
V min
V max
Ω max
Ω max
mA max
V min
V max
V min
V max
kHz min/max
NOXREF bit active if V
REF
< 0.3 V
AV
DD
= 5 V
AV
DD
= 3 V
Continuous current
AV
DD
= 3 V, I
SOURCE
= 100 µA
AV
DD
= 3 V, I
SINK
= 100 µA
AV
DD
= 5 V, I
SOURCE
= 200 µA
AV
DD
= 5 V, I
SINK
= 800 µA
0.8
0.4
2.0
V max
V max
V min
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V or 5 V
1.4/2
0.8/1.7
0.1/0.17
0.9/2
0.4/1.35
0.06/0.13
±10
10
DV
DD
− 0.6
0.4
4
0.4
±10
10
Offset binary
V min/max
V min/max
V min/max
V min/max
V min/max
V min/max
µA max
pF typ
V min
V max
V min
V max
µA max
pF typ
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V
DV
DD
= 3 V
V
IN
= DV
DD
or GND
All digital inputs
DV
DD
= 3 V, I
SOURCE
= 100 µA
DV
DD
= 3 V, I
SINK
= 100 µA
DV
DD
= 5 V, I
SOURCE
= 200 µA
DV
DD
= 5 V, I
SINK
= 1.6 mA
Rev. B | Page 4 of 28
AD [ ANALOG DEVICES ]
