Datasheet AD641 (Analog Devices) - 4

AD641–Typical DC Performance Characteristics 1.015 1.20 1.006 1.010 1.15 1.004 1.005 1.10 1.002 1 1.05 1.000 0.995 1.00 0.998 0.990 INTERCEPT – mV 0.95 SLOPE CURRENT – mA SLOPE CURRENT – mV 0.996 0.985 0.90 0.980 0.85 0.994 –60 –40 –20 0 20 40 60 80 100 120 140 –60 –40 –20 0 20 40 60 80 100 120 140 4.5 5.0 5.5 6.0 6.5 7.0 7.5 TEMPERATURE –
8
C TEMPERATURE –
8
C POWER SUPPLY VOLTAGES –
6
Volts
Figure 1. Slope Current, I Figure 3. Slope Current, I Y, vs. Figure 2. Intercept Voltage, VX, vs. Y, vs. Supply Temperature Temperature Voltages
1.015 14 +0.4 13 +0.3 1.010 INPUT OFFSET VOLTAGE 12 +0.2 DEVIATION WILL BE WITHIN 1.005 SHADED AREA. 11 +0.1 1.000 10 0 0.995 INTERCEPT – mV 9 –0.1 INTERCEPT VOLTAGE – mV 0.990 8 –0.2 0.985 7 –0.3 4.5 5.0 5.5 6.0 6.5 7.0 7.5 –60 –40 –20 0 20 40 60 80 100 120 140 –60 –40 –20 0 20 40 60 80 100 120 140 DEVIATION OF INPUT OFFSET VOLTAGE – mV POWER SUPPLY VOLTAGES –
6
Volts TEMPERATURE –
8
C TEMPERATURE –
8
C
Figure 4. Intercept Voltage, V Figure 6. Input Offset Voltage Devia- X, vs. Figure 5. Intercept Voltage (Using Supply Voltages Attenuator) vs. Temperature tion vs. Temperature
2 2.5 2.5 2.4 1 2.2 0 2.0 2.0 2.0 1.8 1.6 1.4 1.5 1.5 1.2 1.0 0.8 1.0 1.0 0.6 0.4 ERROR – dB 0.2 OUTPUT CURRENT – mA ABSOLUTE ERROR – dB 0.5 ABSOLUTE ERROR – dB 0.5 0 –0.2 –0.4 0 0 0.1 1.0 10.0 100.0 1000.0 –60 –40 –20 0 20 40 60 80 100 120 140 –60 –40 –20 0 20 40 60 80 100 120 140 INPUT VOLTAGE – mV TEMPERATURE –
8
C TEMPERATURE –
8
C (EITHER SIGN)
Figure 8. Absolute Error vs. Tempera- Figure 7. DC Logarithmic Transfer Figure 9. Absolute Error vs. Tempera- Function and Error Curve for Single ture, VIN = ±1 mV to ±100 mV ture, Using Attenuator. VIN = ±10 mV AD641 to ±1 V, Pin 8 Grounded to Disable ITC Bias –4– 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