AD640–SPECIFICATIONS
(V =
S
؎
5 V, TA = +25
؇
C, unless otherwise noted)
DC SPECIFICATIONS
Model
AD640J
AD640B
Typ
AD640T
Typ
Parameter
Conditions
Min
Typ
Max
Min
Max
Min
Max
Units
TRANSFER FUNCTION1
IOUT = IY LOG |VIN/VX| for VIN = ± 0.75 mV to ± 200 mV dc
SIGNAL INPUTS (Pins 1, 20)
Input Resistance
Input Offset Voltage
vs. Temperature
Over Temperature
vs. Supply
Input Bias Current
Input Bias Offset
Differential
Differential
500
50
0.8
500
50
0.8
500
50
0.8
kΩ
µV
µV/°C
µV
µV/V
µA
500
200
200
300
25
TMIN to TMAX
2
7
1
2
7
1
2
7
1
25
25
µA
Common-Mode Range
–2
+0.3
–2
+0.3
–2
+0.3
V
INPUT ATTENUATOR
(Pins 2, 3, 4, 5 and 19)
Attenuation2
Pin 5 to Pin 19
Pins 5 to 3/4
20
300
20
300
20
300
dB
Ω
Input Resistance
SIGNAL OUTPUT (Pins 10, 11)
Small Signal Gain3
50
±180
75
50
± 180
75
50
± 180
75
dB
mV
Ω
Peak Differential Output4
Output Resistance
Either Pin to COM
Either Pin to COM
Quiescent Output Voltage
–90
–90
–90
mV
LOGARITHMIC OUTPUT5 (Pin 14)
Voltage Compliance Range
Slope Current, IY
–0.3
0.95
+VS –1 –0.3
+VS –1
1.02
–0.3
0.98
VS –1
1.02
V
mA
1.00
1.05
0.98
1.00
1.00
Accuracy vs. Temperature
0.002
0.002
0.002
%/°C
mA
%/V
mV
µV/°C
mV
µV/V
TMIN to TMAX
+VS = 4.5 V to 7.5 V
0.98
0.95
0.90
1.02
0.4
1.05
Accuracy vs. Supply
Intercept Voltage6, VX
vs. Temperature
Over Temperature
vs. Supply
0.08
1.00
0.5
1.0
1.15
0.08
1.00
0.5
0.4
1.05
0.08
1.00
0.5
0.85
0.95
TMIN to TMAX
±VS = 4.5 V to 7.5 V
1.10
2
2
2
Logarithmic Offset
(Alt. Definition of VX)
vs. Temperature
Over Temperature
vs. Supply
Intercept Voltage Using Attenuator
Zero Signal Output Current7
ITC Disabled
–61.5 –60.0 –58.7
0.004
–60.5
–60.0
0.004
–59.5
–60.5
–60.9
9.0
–60.0 –59.5
0.004
dBV
dB/°C
dB
dB/V
mV
mA
mA
mA
TMIN to TMAX
±VS = 4.5 V to 7.5 V
–59.1
0.017
0.017
10.0
–0.2
–0.27
2.3
0.017
8.25
10.0
–0.2
–0.27
2.3
11.75
9.0
11.0
10.0
–0.2
–0.27
2.3
11.0
Pin 8 to COM
Maximum Output Current
APPLICATIONS RESISTORS
(Pins 15, 16, 17)
1.000
0.35
0.995
1.000
0.35
1.005
0.6
0.995
1.000 1.005
kΩ
DC LINEARITY
VIN ±1 mV to ± 100 mV
1.2
0.35
0.6
dB
TOTAL ABSOLUTE DC
ACCURACY
VIN = ± 1 mV to ±100 mV8
Over Temperature
Over Supply Range
VIN = ± 0.75 mV to ±200 mV
Using Attenuator
0.55
1.0
2
3
2
3
0.55
1.0
0.9
1.7
1.0
2.0
0.55
1.0
0.9
1.8
1.0
2.0
dB
dB
dB
dB
TMIN to TMAX
±VS = 4.5 V to 7.5 V
VIN = ± 10 mV to ± 1 V
Over Temperature
0.4
0.6
1.2
2.5
3
0.4
0.6
1.2
1.5
2.0
2.5
0.4
0.6
1.2
1.5
2.0
2.5
dB
dB
dB
TMIN to TMAX
VIN = ± 7.5 mV to 2 V
3.5
POWER REQUIREMENTS
Voltage Supply Range
Quiescent Current9
+VS (Pin 12)
؎
4.5
؎
7.5
؎
4.5
؎
7.5
؎
4.5
؎
7.5
V
TMIN to TMAX
TMIN to TMAX
9
35
15
60
9
35
15
60
9
35
15
60
mA
mA
–VS (Pin 7)
REV. C
–2–
ADI [ ADI ]
