Datasheet AD641 (Analog Devices) - 2

AD641–SPECIFICATIONS ELECTRICAL CHARACTERISTICS (VS =
ⴞ
5 V; TA = +25
ⴗ
C, unless otherwise noted) AD641A AD641S Parameter Conditions Min Typ Max Min Typ Max Units
TRANSFER FUNCTION1 (IOUT = IY LOG |VIN/VX|for VIN = 0.75 mV to ±200 mV dc) LOG AMPLIFIER PERFORMANCE 3 dB Bandwidth 250 250 MHz Voltage Compliance Range –0.3 +VS – 1 –0.3 +VS – 1 V Slope Current, IY 0.98 1.00 1.02 0.98 1.00 1.02 mA Accuracy vs. Temperature 0.002 0.002 %/°C Over Temperature TMIN to TMAX 0.96 1.02 mA Intercept dBm 250 MHz –41.06 –40.51 –39.96 –41.06 –40.51 –39.96 dBm Over Temperature TMIN to TMAX, 250 MHz –41.34 –39.47 dBm Zero Signal Output Current2 –0.2 –0.2 mA ITC Disabled Pin 8 to COM –0.27 –0.27 mA Maximum Output Current 2.3 2.3 mA DYNAMIC RANGE Single Configuration 44 44 dB Over Temperature TMIN to TMAX 40 38 dB Dual Configuration 58 58 dB Over Temperature TMIN to TMAX 52 52 dB LOG CONFORMANCE f = 250 MHz Single Configuration –44 dBm to 0 dBm ±0.5 ±2.0 ±0.5 ±2.0 dB Over Temperature –42 dBm to –4 dBm; T ± MIN to TMAX 1.0 ±2.5 dB –42 dBm to –2 dBm, T ± MIN to TMAX 1.0 ±2.5 Dual Configuration S: –60 dBm to –2 dBm; ±0.5 ±2.0 ±0.5 ±2.0 dB Over Temperature A: –56 dBm to –4 dBm, T ± MIN to TMAX 1.0 ±2.5 ±1.0 ±2.5 dB LIMITER CHARACTERISTICS Flatness –44 dBm to 0 dBm @ 10.7 MHz ±1.6 ±1.6 dB Phase Variation –44 dBm to 0 dBm @ 10.7 MHz ±2.0 ±2.0 Degrees INPUT CHARACTERISTICS Input Resistance Differential 500 500 kΩ Input Offset Voltage Differential 50 200 50 200 µV vs. Temperature 0.8 0.8 µV/°C Over Temperature TMIN to TMAX 300 µV vs. Supply 2 2 µV/V Input Bias Current 7 25 7 25 µA Input Bias Offset 1 1 µA Common Mode Input Range –2 +0.3 –2 +0.3 V SIGNAL INPUT (Pins 1, 20) Input Capacitance Either Pin to COM 2 2 pF Noise Spectral Density 1 kHz to 10 MHz 2 2 nV/√Hz Tangential Sensitivity BW = 100 MHz –72 –72 dBm INPUT ATTENUATOR (Pins 2, 3, 4, 5 & 19) Attenuation3 Pins 5 to Pin 19 20 20 dB Input Resistance Pins 5 to 3/4 300 300 Ω APPLICATION RESISTORS (Pins 15, 16, 17) 0.995 1.000 1.005 0.995 1.000 1.005 kΩ OUTPUT CHARACTERISTICS (Pins 10, 11) Peak Differential Output4 ±180 ±180 mV Output Resistance Either Pin to COM 75 75 Ω Quiescent Output Voltage Either Pin to COM –90 –90 mV POWER SUPPLY Voltage Supply Range ±4.5 ±7.5 ±4.5 ±7.5 V Quiescent Current +VS (Pin 12) TMIN to TMAX 9 15 9
15
mA –VS (Pin 7) TMIN to TMAX 35 60 35
60
mA NOTES 1Logarithms to base 10 are used throughout. The response is independent of the sign of VIN. 2The zero-signal current is a function of temperature unless internal temperature compensation (ITC) pin is grounded. 3Attenuation ratio trimmed to calibrate intercept to 10 mV when in use. It has a temperature coefficient of +0.3%/°C. 4The fully limited signal output will appear to be a square wave; its amplitude is proportional to absolute temperature. Specifications subject to change without notice. –2– REV. D Document Outline FEATURES PRODUCT DESCRIPTION PIN CONFIGURATIONS AD641--SPECIFICATIONS ELECTRICAL CHARACTERISTICS THERMAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION REVISION HISTORY AD641--TYPICAL DC PERFORMANCE CHARACTERISTICS TYPICAL AC PERFORMANCE CHARACTERISTICS CIRCUIT DESCRIPTION CIRCUIT OPERATION FUNDAMENTALS OF LOGARITHMIC CONVERSION INTERCEPT STABILIZATION CONVERSION RANGE EFFECT OF WAVEFORM ON INTERCEPT LOGARITHMIC CONFORMANCE AND WAVEFORM SIGNAL MAGNITUDE INTERCEPT AND LOGARITHMIC OFFSET OPERATION OF A SINGLE AD641 ACTIVE CURENT-TO-VOLTAGE CONVERSION EFFECT OF FREQUENCY ON CALIBRATION SOURCE RESISTANCE AND INPUT OFFSET USING HIGHER SUPPLY VOLTAGES USING THE ATTENUATOR OPERATION OF CASCADED AD641s ELIMINATING THE EFFECT OF FIRST STAGE OFFSET PRACTICAL APPLICATIONS RSSI APPLICATIONS 250 MHz RSSI CONVERTER WITH 58 dB DYNAMIC RANGE OUTLINE DIMENSIONS ORDERING GUIDE