AD8307

低成本DC - 500 MHz的92分贝对数放大器 Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

Product Details

The is the first logarithmic amplifier made available in an 8-lead SOIC_N 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. The AD8307 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 7.5 mA is needed. A fast acting CMOS-compatible control pin can disable the AD8307 to a standby current of 150 μA.

The AD8307 operates over the industrial temperature range of −40°C to +85°C and is available in an 8-lead SOIC package and an 8-lead PDIP.

Applications

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Conversion of signal level to decibel form 

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Transmitter antenna power measurement 

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Receiver signal strength indication RSSI 

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Low cost radar and sonar signal processing 

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Network and spectrum analyzers to 120 dB 

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Signal level determination down to 20 Hz 

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True decibel ac mode for multimeters

### Features and Benefits

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Complete multistage logarithmic amplifier

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92 dB dynamic range: –75 dBm to +17 dBm to –90 dBm using matching network

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Single supply of 2.7 V minimum at 7.5 mA typical

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DC to 500 MHz operation, ±1 dB linearity

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Slope of 25 mV/dB, intercept of –84 dBm

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Highly stable scaling over temperature

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Fully differential dc-coupled signal path

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100 ns power-up time, 150 µA sleep current