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AD8307AR-REEL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8307AR-REEL7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD8307 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier FUNCTIONAL BLOCK DIAGRAM BANDGAP REFERENCE AND BIASING SIX 14.3dB 900MHz AMPLIFIER STAGES MIRROR INPUT-OFFSET COMPENSATION LOOP COMMON –INPUT +INPUT SUPPLY ENABLE INT. ADJ OUTPUT OFS. ADJ. AD8307 7.5mA 1.15k 3 2 2 A /dB 12.5k COM NINE DETECTOR CELLS SPACED 14.3dB INT ENB OUT OFS COM INM INP VPS FEATURES Complete Multistage Logarithmic Amplifier 92 dB Dynamic Range: –75 dBm to +17 dBm to –90 dBm Using Matching Network Single Supply of 2.7 V Min at 7.5 mA Typical DC-500 MHz Operation, 1 dB Linearity Slope of 25 mV/dB, Intercept of –84 dBm Highly Stable Scaling Over Temperature Fully Differential DC-Coupled Signal Path 100 ns Power-Up Time, 150 A 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 (to 120 dB) Signal Level Determination Down to 20 Hz True Decibel AC Mode for Multimeters PRODUCT DESCRIPTION The AD8307 is the first logarithmic amplifier in an 8-lead (SO-8) package. It is a complete 500 MHz monolithic demodulating logarithmic amplifier based on the progressive compression (successive detection) technique, providing a dynamic range of 92 dB to ±3 dB law-conformance and 88 dB to a tight ±1 dB error bound at all frequencies up to 100 MHz. It is extremely stable and easy to use, requiring no significant external compo- nents. A single supply voltage of 2.7 V to 5.5 V at 7.5 mA is needed, corresponding to an unprecedented power consumption of only 22.5 mW at 3 V. A fast-acting CMOS-compatible con- trol pin can disable the AD8307 to a standby current of under 150 µA. Each of the cascaded amplifier/limiter cells has a small-signal gain of 14.3 dB, with a –3 dB bandwidth of 900 MHz. The input is fully differential and at a moderately high impedance (1.1 k Ω in parallel with about 1.4 pF). The AD8307 provides a basic dynamic range extending from approximately –75 dBm (where dBm refers to a 50 Ω source, that is, a sine amplitude of about ±56 µV) up to +17 dBm (a sine amplitude of ± 2.2 V). A simple input-matching network can lower this range to –88 dBm to +3 dBm. The logarithmic linearity is typically within ±0.3 dB up to 100 MHz over the central portion of this range, and is degraded only slightly at 500 MHz. There is no minimum frequency limit; the AD8307 may be used at audio frequencies (20 Hz) or even lower. The output is a voltage scaled 25 mV/dB, generated by a current of nominally 2 µA/dB through an internal 12.5 kΩ resistor. This voltage varies from 0.25 V at an input of –74 dBm (that is, the ac intercept is at –84 dBm, a 20 µV rms sine input), up to 2.5 V for an input of +16 dBm. This slope and intercept can be trimmed using external adjustments. Using a 2.7 V supply, the output scaling may be lowered, for example to 15 mV/dB, to permit utilization of the full dynamic range. The AD8307 exhibits excellent supply insensitivity and tem- perature stability of the scaling parameters. The unique combi- nation of low cost, small size, low power consumption, high accuracy and stability, very high dynamic range, and a frequency range encompassing audio through IF to UHF, make this prod- uct useful in numerous applications requiring the reduction of a signal to its decibel equivalent. The AD8307 is available in the industrial temperature range of –40 °C to +85°C, and in 8-lead SOIC and PDIP packages. |
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