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Datasheet Analog Devices AD8310ACHIPS

Manufacturer:Analog Devices
Series:AD8310
Part Number:AD8310ACHIPS

Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier

Datasheets

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    Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier AD8310
    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 to 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
    SUPPLY
    5 FUNCTIONAL BLOCK DIAGRAM
    VPOS 8mA BAND GAP REFERENCE AND BIASING INHI 1.0k INLO 3 NINE DETECTOR CELLS SPACED 14.3dB COMMON
    2 AD8310 ENBL BFIN 7 ENABLE BUFFER INPUT SIX 14.3dB 900MHz AMPLIFIER STAGES MIRROR 2A /dB 2 3k COMM 6 +INPUT INPUT 8 1 + VOUT 3k 4 OUTPUT COMM INPUT-OFFSET COMPENSATION LOOP 1k OFLT 33pF COMM
    3 COMM 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
    Figure 1. GENERAL DESCRIPTION
    The AD8310 is a complete, dc to 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 CMOScompatible enable pin is provided. Each of the six cascaded amplifier/limiter cells has a smallsignal 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 V, 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 supplyand temperature-independent. The fully differential input offers a moderately high impedance (1 k in parallel with about 1 pF). A simple network can match the input to 50 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 grea ...

Docket:
Fast, Voltage-Out, DC to 440 MHz, 95 dB Logarithmic Amplifier AD8310
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 to 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
SUPPLY
5 FUNCTIONAL BLOCK DIAGRAM
VPOS 8mA BAND GAP REFERENCE AND BIASING INHI 1.0k INLO 3 NINE DETECTOR CELLS SPACED 14.3dB COMMON
2 AD8310 ENBL BFIN 7 ENABLE BUFFER INPUT SIX 14.3dB 900MHz AMPLIFIER STAGES MIRROR 2A /dB 2 3k COMM 6 +INPUT INPUT 8 1 + VOUT 3k 4 OUTPUT COMM INPUT-OFFSET COMPENSATION LOOP 1k OFLT 33pF COMM
3 COMM 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
Figure 1. GENERAL DESCRIPTION
The AD8310 is a complete, dc to 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 u...

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