AD7711A Analog Devices, AD7711A Datasheet - Page 3

• Manufacturer Part Number: AD7711A
• Description: CMOS, 24-Bit Sigma-Delta, Signal Conditioning ADC with RTD Current Source
• Manufacturer: Analog Devices

Specifications of AD7711A

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 19.5kSPS
• Interface: Ser
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip (Vref)/(PGA Gain),Uni (Vref)/(PGA Gain)
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC

Parameter
V
LOGIC INPUTS
LOGIC OUTPUTS
TRANSDUCER BURNOUT
RTD EXCITATION CURRENT
SYSTEM CALIBRATION
NOTES
12
13
14
15
REV. D
BIAS
The AD7711A is tested with the following V
Guaranteed by design, not production tested.
After calibration, if the analog input exceeds positive full scale, the converter will output all 1s. If the analog input is less than negative full scale, then the device will
These calibration and span limits apply provided the absolute voltage on the analog inputs does not exceed AV
AV
output all 0s.
The offset calibration limit applies to both the unipolar zero point and the bipolar zero point.
Input Voltage Range
V
Input Current
All Inputs except MCLK IN
MCLK IN Only
V
V
Floating State Leakage Current
Floating State Output Capacitance
Current
Initial Tolerance @ 25∞C
Drift
Output Current
Initial Tolerance @ 25∞C
Drift
Line Regulation (AV
Load Regulation
Output Compliance
Positive Full-Scale Calibration Limit
Negative Full-Scale Calibration Limit
Offset Calibration Limit
Input Span
BIAS
OL
OH
DD
V
V
V
V
INPUT
, Output Low Voltage
, Output High Voltage
INL
INH
INL
INH
= 5 V and V
Rejection
, Input Low Voltage
, Input Low Voltage
, Input High Voltage
, Input High Voltage
12
15
SS
= –5 V, V
DD
)
15
BIAS
= 0 V.
13
14
14
BIAS
voltages. With AV
A, S Versions
AV
or AV
or AV
V
or V
or V
65 to 85
± 10
0.8
2.0
0.8
3.5
0.4
DV
± 10
9
4.5
± 10
0.1
400
± 20
20
400
400
AV
(1.05 ¥ V
–(1.05 ¥ V
–(1.05 ¥ V
0.8 ¥ V
(2.1 ¥ V
SS
DD
DD
DD
+ 0.85 ¥ V
SS
SS
DD
DD
– 0.85 ¥ V
– 2
– 1
+ 3
+ 2.1
REF
REF
– 3.5
– 2.1
REF
/GAIN
REF
REF
)/GAIN
)/GAIN
)/GAIN
)/GAIN
DD
1
REF
REF
= 5 V and V
–3–
Unit
V max
V max
V min
V min
dB typ
mA max
V max
V min
V max
V min
V max
V min
mA max
pF typ
mA nom
% typ
%/∞C typ
mA nom
% max
ppm/∞C typ
nA/V max
nA/V max
V max
V max
V max
V max
V min
V max
SS
= 0 V, V
BIAS
= 2.5 V, with AV
Conditions/Comments
See V
Whichever Is Smaller: +5 V/–5 V or +10 V/0 V
Nominal AV
Whichever Is Smaller: +5 V/0 V Nominal AV
See V
Whichever Is Greater: +5 V/–5 V or +10 V/0 V
Nominal AV
Whichever Is Greater: +5 V/0 V Nominal AV
Increasing with Gain
I
I
AV
GAIN Is the Selected PGA Gain (Between 1 and 128)
GAIN Is the Selected PGA Gain (Between 1 and 128)
GAIN Is the Selected PGA Gain (Between 1 and 128)
GAIN Is the Selected PGA Gain (Between 1 and 128)
GAIN Is the Selected PGA Gain (Between 1 and 128)
SINK
SOURCE
DD
= 1.6 mA
BIAS
BIAS
= 5 V
DD
= 100 mA
Input Section
Input Section
+ 30 mV or go more negative than V
DD
DD
DD
= 10 V and V
/V
/V
SS
SS
SS
= 0 V, V
BIAS
= 5 V, and with
AD7711A
DD
DD
SS
/V
/V
– 30 mV.
SS
SS