Typical DC Performance Characteristics–AD640
1.015
1.010
SLOPE CURRENT – mA
1.005
1
0.995
0.990
0.985
0.980
–60 –40 –20
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
–60 –40 –20
SLOPE CURRENT – mA
0 20 40 60 80 100 120 140
TEMPERATURE – C
1.006
1.004
1.002
1.000
0.998
0.996
0.994
4.5
INTERCEPT – mV
0 20 40 60 80 100 120 140
TEMPERATURE – C
5.0
5.5
6.0
6.5
7.0
7.5
POWER SUPPLY VOLTAGES – Volts
Figure 1. Slope Current, I
Y
vs.
Temperature
Figure 2. Intercept Voltage, V
X
, vs.
Temperature
Figure 3. Slope Current, I
Y
vs.
Supply Voltages
1.015
1.010
1.005
INTERCEPT – mV
DEVIATION OF INPUT OFFSET VOLTAGE – mV
14
13
12
11
10
9
8
7
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – C
+0.4
+0.3
+0.2
+0.1
0
–0.1
–0.2
–0.3
–60 –40 –20
INPUT OFFSET VOLTAGE
DEVIATION WILL BE WITHIN
SHADED AREA.
INTERCEPT VOLTAGE – mV
1.000
0.995
0.990
0.985
4.5
5.0
5.5
6.0
6.5
7.0
7.5
POWER SUPPLY VOLTAGES – Volts
0 20 40 60 80 100 120 140
TEMPERATURE – C
Figure 4. Intercept Voltage, V
X
, vs.
Supply Voltages
Figure 5. Intercept Voltage (Using
Attenuator) vs. Temperature
Figure 6. Input Offset Voltage
Deviation vs. Temperature
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
0.1
ERROR – dB
2
1
0
2.5
2.5
OUTPUT CURRENT – mA
ABSOLUTE ERROR – dB
1.5
ABSOLUTE ERROR – dB
0 20 40 60 80 100 120 140
TEMPERATURE – C
2.0
2.0
1.5
1.0
1.0
0.5
0.5
1.0
10.0
100.0
INPUT VOLTAGE – mV
(EITHER SIGN)
1000.0
0
–60 –40 –20
0
–60 –40 –20
0 20 40 60 80 100 120 140
TEMPERATURE – C
Figure 7. DC Logarithmic Transfer
Function and Error Curve for Single
AD640
Figure 8. Absolute Error vs. Tem-
perature, V
IN
= 1 mV to 100 mV
Figure 9. Absolute Error vs.
Temperature, Using Attenuator.
V
IN
= 10 mV to 1 V, Pin 8
Grounded to Disable ITC Bias
REV. C
–5–
AD [ ANALOG DEVICES ]
