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AD8310-EVAL Datasheet(PDF) 1 Page - Analog Devices |
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AD8310-EVAL Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page Fast, Voltage-Out DC–440 MHz, 95 dB Logarithmic Amplifier AD8310 Rev. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Multistage demodulating logarithmic amplifier Voltage output, rise time <15 ns High current capacity: 25 mA into grounded RL 95 dB dynamic range: −91 dBV to +4 dBV Single supply of 2.7 V min at 8 mA typ DC–440 MHz operation, ±0.4 dB linearity Slope of +24 mV/dB, intercept of −108 dBV Highly stable scaling over temperature Fully differential dc-coupled signal path 100 ns power-up time, 1 mA sleep current APPLICATIONS Conversion of signal level to decibel form Transmitter antenna power measurement Receiver signal strength indication (RSSI) Low cost radar and sonar signal processing Network and spectrum analyzers Signal-level determination down to 20 Hz True-decibel ac mode for multimeters GENERAL DESCRIPTION The AD8310 is a complete, dc−440 MHz demodulating logarithmic amplifier (log amp) with a very fast voltage mode output, capable of driving up to 25 mA into a grounded load in under 15 ns. It uses the progressive compression (successive detection) technique to provide a dynamic range of up to 95 dB to ±3 dB law conformance or 90 dB to a ±1 dB error bound up to 100 MHz. It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2.7 V to 5.5 V at 8 mA is needed, corresponding to a power consumption of only 24 mW at 3 V. A fast-acting CMOS- compatible enable pin is provided. Each of the six cascaded amplifier/limiter cells has a small- signal gain of 14.3 dB, with a −3 dB bandwidth of 900 MHz. A total of nine detector cells are used to provide a dynamic range that extends from −91 dBV (where 0 dBV is defined as the amplitude of a 1 V rms sine wave), an amplitude of about ±40 μV, up to +4 dBV (or ±2.2 V). The demodulated output is accurately scaled, with a log slope of 24 mV/dB and an intercept of −108 dBV. The scaling parameters are supply- and temperature-independent. FUNCTIONAL BLOCK DIAGRAM + – VPOS INHI INLO COMM 3 8mA 1.0k Ω BAND GAP REFERENCE AND BIASING SIX 14.3dB 900MHz AMPLIFIER STAGES NINE DETECTOR CELLS SPACED 14.3dB INPUT-OFFSET COMPENSATION LOOP 2 2 μA /dB MIRROR 3k Ω 3k Ω 1k Ω COMM COMM COMM ENBL BFIN VOUT OFLT ENABLE BUFFER INPUT OUTPUT OFFSET FILTER AD8310 SUPPLY +INPUT –INPUT COMMON 33pF 8 7 6 5 1 2 3 4 Figure 1. The fully differential input offers a moderately high impedance (1 kΩ in parallel with about 1 pF). A simple network can match the input to 50 Ω and provide a power sensitivity of −78 dBm to +17 dBm. The logarithmic linearity is typically within ±0.4 dB up to 100 MHz over the central portion of the range, but it is somewhat greater at 440 MHz. There is no minimum frequency limit; the AD8310 can be used down to low audio frequencies. Special filtering features are provided to support this wide range. The output voltage runs from a noise-limited lower boundary of 400 mV to an upper limit within 200 mV of the supply voltage for light loads. The slope and intercept can be readily altered using external resistors. The output is tolerant of a wide variety of load conditions and is stable with capacitive loads of 100 pF. The AD8310 provides a unique combination of low cost, small size, low power consumption, high accuracy and stability, high dynamic range, a frequency range encompassing audio to UHF, fast response time, and good load-driving capabilities, making this product useful in numerous applications that require the reduction of a signal to its decibel equivalent. The AD8310 is available in the industrial temperature range of −40°C to +85°C in an 8-lead MSOP package. |
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