AD7798 Analog Devices, AD7798 Datasheet - Page 4

• Manufacturer Part Number: AD7798
• Description: 3-Channel, Low Noise, Low Power, 16-Bit, Sigma Delta ADC with On-Chip In-Amp
• Manufacturer: Analog Devices

Specifications of AD7798

• Resolution (bits): 16bit
• # Chan: 3
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7798/AD7799
Parameter
REFERENCE
LOW-SIDE POWER SWITCH
DIGITAL OUTPUTS (P1 and P2)
INTERNAL CLOCK
LOGIC INPUTS
LOGIC OUTPUTS
External REFIN Voltage
Reference Voltage Range
Absolute REFIN Voltage Limits
Average Reference Input Current
Average Reference Input Current Drift
Normal Mode Rejection
Common-Mode Rejection
Reference Detect Levels
R
Allowable Current
Output High Voltage, V
Output Low Voltage, V
Output High Voltage, V
Output Low Voltage, V
Frequency
CS
SCLK and DIN
Input Currents
Input Capacitance
Output High Voltage, V
Output Low Voltage, V
Output High Voltage, V
Output Low Voltage, V
Floating-State Leakage Current
Floating-State Output Capacitance
Data Output Coding
ON
Input Low Voltage, V
Input High Voltage, V
(Schmitt-Triggered Input)
V
V
V
V
V
V
2
T
T
T
T
T
T
(+)
(–)
(+) – V
(+)
(–)
(+) − V
2
T
T
(–)
(–)
2
OL
OL
OL
OL
OH
OH
INL
OH
OH
INH
2
2
2
2
2
2
2
2
2
2
2
0.4
AD7798B/AD7799B
2.5
0.1
AV
GND − 30 mV
AV
400
±0.03
Same as for analog
inputs
100
0.3
0.65
7
9
30
AV
4
0.4
64 ± 3%
0.8
0.4
2.0
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
0.4
4
0.4
±10
10
Offset binary
DD
DD
DD
DD
+ 30 mV
− 0.6
− 0.6
Rev. A | Page 4 of 28
1
Unit
V nom
V min
V max
V min
V max
nA/V typ
nA/V/°C typ
dB typ
V min
V max
Ω max
Ω max
mA max
V min
V max
V min
V max
kHz min/max
V max
V max
V min
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
Test Conditions/Comments
REFIN = REFIN(+) − REFIN(−)
When V
limited to (0.9 x V
NOXREF bit active if V
AV
AV
Continuous current
AV
AV
AV
AV
DV
DV
DV
DV
DV
DV
DV
DV
DV
V
All digital inputs
DV
DV
DV
DV
IN
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
= DV
= 5 V
= 3 V
= 3 V, I
= 3 V, I
= 5 V, I
= 5 V, I
= 5 V
= 3 V
= 3 V or 5 V
= 5 V
= 5 V
= 5 V
= 3 V
= 3 V
= 3 V
= 3 V, I
= 3 V, I
= 5 V, I
= 5 V, I
REF
DD
= AV
or GND
SOURCE
SINK
SOURCE
SINK
SOURCE
SINK
SOURCE
SINK
= 100 μA
= 800 μA
DD
= 100 μA
= 1.6 mA
, the differential input must be
= 100 μA
= 200 μA
REF
= 100 μA
= 200 μA
/gain) if the in-amp is active.
REF
< 0.3 V