Datasheet AD640 (Analog Devices) - 3

AD640–SPECIFICATIONS DC SPECIFICATIONS (VS =
ⴞ
5 V, TA = +25
ⴗ
C, unless otherwise noted) Model AD640J AD640B AD640T Parameter Conditions Min Typ Max Min Typ Max Min Typ 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 Differential 500 500 500 kΩ Input Offset Voltage Differential 50
500
50
200
50
200
µV vs. Temperature 0.8 0.8 0.8 µV/°C Over Temperature TMIN to TMAX
300
µV vs. Supply 2 2 2 µV/V Input Bias Current 7 25 7 25 7 25 µA Input Bias Offset 1 1 1 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 20 20 20 dB Input Resistance Pins 5 to 3/4 300 300 300 Ω SIGNAL OUTPUT (Pins 10, 11) Small Signal Gain3 50 50 50 dB Peak Differential Output4 ±180 ± 180 ± 180 mV Output Resistance Either Pin to COM 75 75 75 Ω Quiescent Output Voltage Either Pin to COM –90 –90 –90 mV LOGARITHMIC OUTPUT5 (Pin 14) Voltage Compliance Range –0.3 +VS –1 –0.3 +VS –1 –0.3 VS –1 V Slope Current, IY
0.95
1.00
1.05 0.98
1.00
1.02 0.98
1.00
1.02
mA Accuracy vs. Temperature 0.002 0.002 0.002 %/°C TMIN to TMAX
0.96 1.02
mA Accuracy vs. Supply +VS = 4.5 V to 7.5 V 0.08
1.0
0.08
0.4
0.08
0.4
%/V Intercept Voltage6, VX
0.85
0.99
1.15 0.9
3 0.99
1.05 0.93
0.99
1.05
mV vs. Temperature 0.5 0.5 0.5 µV/°C Over Temperature TMIN to TMAX
0.90 1.10
mV vs. Supply ±VS = 4.5 V to 7.5 V 2 2 2 µV/V Logarithmic Offset (Alt. Definition of VX) –61.5 –60.0 –58.7 –60.5 –60.0 –59.5 –60.5 –60.0 –59.5 dBV vs. Temperature 0.004 0.004 0.004 dB/°C Over Temperature TMIN to TMAX –60.9 –59.1 dB vs. Supply ±VS = 4.5 V to 7.5 V 0.017 0.017 0.017 dB/V Intercept Voltage Using Attenuator
8.25
10.0
11.75 9.0
10.0
11.0 9.0
10.0 11.0 mV Zero Signal Output Current7 –0.2 –0.2 –0.2 mA ITC Disabled Pin 8 to COM –0.27 –0.27 –0.27 mA Maximum Output Current 2.3 2.3 2.3 mA APPLICATIONS RESISTORS (Pins 15, 16, 17) 1.000
0.995
1.000
1.005 0.995
1.000
1.005
kΩ DC LINEARITY VIN ±1 mV to ± 100 mV 0.35
1.2
0.35
0.6
0.35
0.6
dB TOTAL ABSOLUTE DC ACCURACY VIN = ± 1 mV to ±100 mV8 0.55
2
0.55
1.2
0.55
1.2
dB Over Temperature TMIN to TMAX 3
2.0 2.0
dB Over Supply Range ±VS = 4.5 V to 7.5 V
2 1.5 1.5
dB VIN = ± 0.75 mV to ±200 mV 1.0
3
1.0
2.0
1.0
2.0
dB Using Attenuator VIN = ± 10 mV to ± 1 V 0.4
2.5
0.4
1.5
0.4
1.5
dB Over Temperature TMIN to TMAX 0.6 3 0.6
2.2
0.6
2.2
dB VIN = ± 7.5 mV to 2 V 1.2
3.5
1.2
2.5
1.2
2.5
dB POWER REQUIREMENTS Voltage Supply Range ⴞ
4.5
ⴞ
7.5
ⴞ
4.5
ⴞ
7.5
ⴞ
4.5
ⴞ
7.5
V Quiescent Current9 +VS (Pin 12) TMIN to TMAX 9 15 9
15
9
15
mA –VS (Pin 7) TMIN to TMAX 35 60 35
60
35
60
mA –2– REV. D Document Outline AD640-SPECIFICATIONS DC Specifications AC Specifications Thermal Characteristics ABSOLUTE MAXIMUM RATINGS TYPICAL DC PERFORMANCE CHARACTERISTICS TYPICAL AC PERFORMANCE CHARACTERISTICS OUTLINE DIMENSIONS ORDERING GUIDE