Datasheet AD640 (Analog Devices) - 4

AD640 AC SPECIFICATIONS (VS =
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5 V, TA = +25
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C, unless otherwise noted) Model AD640J AD640B AD640T Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units
SIGNAL INPUTS (Pins 1, 20) Input Capacitance Either Pin to COM 2 2 2 pF Noise Spectral Density 1 kHz to 10 MHz 2 2 2 nV/√Hz Tangential Sensitivity BW = 100 MHz –72 –72 –72 dBm 3 dB BANDWIDTH Each Stage 350 350 350 MHz All Five Stages Pins 1 & 20 to 10 & 11 145 145 145 MHz LOGARITHMIC OUTPUTS5 Slope Current, IY f< = 1 MHz 0.96 1.0 1.04 0.98 1.0 1.02 0.98 1.0 1.02 mA f = 30 MHz 0.88 0.94 1.00 0.91 0.94 0.97 0.91 0.94 0.97 mA f = 60 MHz 0.82 0.90 0.98 0.86 0.90 0.94 0.86 0.90 0.94 mA f = 90 MHz 0.88 0.88 0.88 mA f = 120 MHz 0.85 0.85 0.85 mA Intercept, Dual AD640s10, 11 f< = 1 MHz –90.6 –88.6 –86.6 –90.0 –88.6 –87.6 –90.0 –88.6 –87.6 dBm f = 30 MHz –87.6 –87.6 –87.6 dBm f = 60 MHz –86.3 –86.3 –86.3 dBm f = 90 MHz –83.9 –83.9 –83.9 dBm f = 120 MHz –80.3 –80.3 –80.3 dBm AC LINEARITY –40 dBm to –2 dBm12 f = 1 MHz 0.5 2.0 0.5 1.0 0.5 1.0 dB –35 dBm to –10 dBm12 f = 1 MHz 0.25 1.0 0.25 0.5 0.25 0.5 dB –75 dBm to 0 dBm10 f = 1 MHz 0.75 3.0 0.75 1.5 0.75 1.5 dB –70 dBm to –10 dBm10 f = 1 MHz 0.5 2.0 0.5 1.0 0.5 1.0 dB –75 dBm to +15 dBm13 f = 10 kHz 0.5 3.0 0.5 1.5 0.5 1.5 dB PACKAGE OPTION 20-Lead Ceramic SBDIP Package (D) AD640TD 20-Terminal Ceramic LCC (E) AD640BE AD640TE 20-Lead Plastic DIP Package (N) AD640]N 20-Lead Plastic Leaded Chip Carrier (P) AD640JP AD640BP NUMBER OF TRANSISTORS 155 155 155 NOTES 1Logarithms to base 10 are used throughout. The response is independent of the sign of V IN. 2Attenuation ratio trimmed to calibrate intercept to 10 mV when in use. It has a temperature coefficient of +0.30%/ °C. 3Overall gain is trimmed using a ± 200 µV square wave at 2 kHz, corrected for the onset of compression. 4The fully limited signal output will appear to be a square wave; its amplitude is proportional to absolute temperature. 5Currents defined as flowing into Pin 14. See FUNDAMENTALS OF LOGARITHMIC CONVERSION for full explanation of scaling concepts. Slope is measured by linear regression over central region of transfer function. 6The logarithmic intercept in dBV (decibels relative to 1 V) is defined as 20 LOG 10 (VX/1 V). 7The zero-signal current is a function of temperature unless internal temperature compensation (ITC) pin is grounded. 8Operating in circuit of Figure 24 using ± 0.1% accurate values for RLA and RLB. Includes slope and nonlinearity errors. Input offset errors also included for VIN >3 mV dc, and over the full input range in ac applications. 9Essentially independent of supply voltages. 10Using the circuit of Figure 27, using cascaded AD640s and offset nulling. Input is sinusoidal, 0 dBm in 50 Ω = 223 mV rms. 11For a sinusoidal signal (see EFFECT OF WAVEFORM ON INTERCEPT). Pin 8 on second AD640 must be grounded to ensure temperature stability of intercept for dual AD640 system. 12Using the circuit of Figure 24, using single AD640 and offset nulling. Input is sinusoidal, 0 dBm in 50 Ω = 223 mV rms. 13Using the circuit of Figure 32, using cascaded AD640s and attenuator. Square wave input. All min and max specifications are guaranteed, but only those in
boldface
are 100% tested on all production units. Results from those tests are used to calculate outgoing quality levels. Specifications subject to change without notice.
THERMAL CHARACTERISTICS
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JC (
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C/W)
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JA (
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C/W)
20-Lead Ceramic SBDIP Package (D-20) 25 85 20-Terminal Ceramic LCC (E-20-1) 25 85 20-Lead Plastic DIP Package (N-20) 24 61 20-Lead Plastic Leaded Chip Carrier (P-20) 28 75 REV. D –3– 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