AD640 Analog Devices, AD640 Datasheet - Page 5

• Manufacturer Part Number: AD640
• Description: DC-Coupled Demodulating 120 MHz Logarithmic Amplifier
• Manufacturer: Analog Devices

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