
AD693–SPECIFICATIONS
REV. A
–2–
(@ +25 C and VS = +24 V. Input Span = 30 mV or 60 mV. Output Span = 4–20 mA,
RL = 250
, VCM = 3.1 V, with external pass transistor unless otherwise noted.)
Model
AD693AD/AQ/AE
Conditions
Min
Typ
Max
Units
LOOP-POWERED OPERATION
TOTAL UNADJUSTED ERROR
1, 2
±0.25
0.5
% Full Scale
TMIN to TMAX
±0.4
0.75
% Full Scale
100
RTD CALIBRATION ERROR3
(See Figure 17)
±0.5
±2.0
°C
LOOP POWERED OPERATION
2
Zero Current Error4
Zero = 4 mA
±25
80
A
Zero = 12 mA
±40
120
A
Zero = 0 mA
5
+7
+35
+100
A
vs. Temp.
Zero = 4 mA
±0.5
±1.5
A/°C
Power Supply Rejection (RTI)
12 V
≤ V
OP
≤ 36V6
±3.0
5.6
V/V
0 V
≤ V
CM
≤ 6.2 V
Common-Mode Input Range
(See Figure 3)
0
+VOP – 4 V
6
V
Common-Mode Rejection (RTI)
0 V
≤ V
CM
≤ 6.2 V
±10
30
V/V
Input Bias Current
7
+5
+20
nA
TMIN to TMAX
+7
+25
nA
Input Offset Current
7
VSIG = 0
±0.5
3.0
nA
Transconductance
Nominal
30 mV Input Span
0.5333
A/V
60 mV Input Span
0.2666
A/V
Unadjusted Error
±0.05
0.2
%
vs. Common-Mode
0 V
≤ V
CM ≤ 6.2 V
30 mV Input Span
±0.03
±0.04
%/V
60 mV Input Span
±0.05
±0.06
%/V
Error vs. Temp.
±20
±50
ppm/
°C
Nonlinearity
8
30 mV Input Span
±0.01
0.05
% of Span
60 mV Input Span
±0.02
0.07
% of Span
OPERATIONAL VOLTAGE RANGE
Operational Voltage, VOP
6
+12
+36
V
Quiescent Current
Into Pin 9
+500
+700
A
OUTPUT CURRENT LIMIT
+21
+25
+32
mA
COMPONENTS OF ERROR
SIGNAL AMPLIFIER
9
Input Voltage Offset
±40
200
V
vs. Temp
±1.0
±2.5
V/°C
Power Supply Rejection
12 V
≤ V
OP
≤ 36 V6
±3.0
5.6
V/V
0 V
≤ V
CM
≤ 6.2 V
V/I CONVERTER
9, 10
Zero Current Error
Output Span = 4–20 mA
±30
±80
A
Power Supply Rejection
12 V
≤ V
OP ≤ 36 V
6
±1.0
±3.0
A/V
Transconductance
Nominal
0.2666
A/V
Unadjusted Error
±0.05
±0.2
%
6.200 V REFERENCE9, 12
Output Voltage Tolerance
±3
12
mV
vs. Temp.
±20
±50
ppm/
°C
Line Regulation
12 V
≤ V
OP ≤ 36 V
6
±200
300
V/V
Load Regulation
11
0 mA
≤ I
REF
≤ 3 mA
±0.3
0.75
mV/mA
Output Current
13
Loop Powered, (Figure 10)
+3.0
+3.5
mA
3-Wire Mode, (Figure 15)
+5.0
mA