Datasheet

Typical DC Performance Characteristics–AD640
REV. C –5–
1.015
1.010
1.005
1
0.995
0.990
0.985
0.980
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
SLOPE CURRENT – mA
Figure 1. Slope Current, I
Y
vs.
Temperature
4.5 5.0 5.5 6.0 6.5 7.0 7.5
POWER SUPPLY VOLTAGES – 6 Volts
INTERCEPT VOLTAGE – mV
1.015
1.010
1.005
1.000
0.995
0.990
0.985
Figure 4. Intercept Voltage, V
X
, vs.
Supply Voltages
INPUT VOLTAGE – mV
(EITHER SIGN)
OUTPUT CURRENT – mA
2
1.0
0.1 1.0 1000.010.0 100.0
1
1.2
1.4
1.6
1.8
2.0
2.2
2.4
0.8
0.6
0.4
0.2
0
–0.2
–0.4
ERROR – dB
0
Figure 7. DC Logarithmic Transfer
Function and Error Curve for Single
AD640
1.20
1.15
1.10
1.05
1.00
0.95
0.90
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
INTERCEPT – mV
0.85
Figure 2. Intercept Voltage, V
X
, vs.
Temperature
14
13
12
11
10
9
8
7
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
INTERCEPT – mV
Figure 5. Intercept Voltage (Using
Attenuator) vs. Temperature
2.5
2.0
1.5
1.0
0.5
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
0
ABSOLUTE ERROR – dB
Figure 8. Absolute Error vs. Tem-
perature, V
IN
= ⴞ 1 mV to ⴞ 100 mV
4.5 5.0 5.5 6.0 6.5 7.0 7.5
POWER SUPPLY VOLTAGES – 6 Volts
SLOPE CURRENT – mA
1.006
1.004
1.002
1.000
0.998
0.996
0.994
Figure 3. Slope Current, I
Y
vs.
Supply Voltages
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
DEVIATION OF INPUT OFFSET VOLTAGE – mV
0
–0.1
+0.4
+0.3
+0.2
+0.1
–0.2
–0.3
INPUT OFFSET VOLTAGE
DEVIATION WILL BE WITHIN
SHADED AREA.
Figure 6. Input Offset Voltage
Deviation vs. Temperature
2.5
2.0
1.5
1.0
0.5
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – 8C
0
ABSOLUTE ERROR – dB
Figure 9. Absolute Error vs.
Temperature, Using Attenuator.
V
IN
= ⴞ 10 mV to ⴞ 1 V, Pin 8
Grounded to Disable ITC Bias