AD606:  50 MHz, 80 dB Demodulating Logarithmic Amplifier with Limiter Output

The AD606 is a complete, monolithic logarithmic amplifier using a 9-stage "successive-detection" technique. It provides both logarithmic and limited outputs. The logarithmic output is from a ...More

AD606:  50 MHz, 80 dB Demodulating Logarithmic Amplifier with Limiter Output

Product Description

The AD606 is a complete, monolithic logarithmic amplifier using a 9-stage "successive-detection" technique. It provides both logarithmic and limited outputs. The logarithmic output is from a three-pole post-demodulation low-pass filter and provides a loadable output voltage of +0.1 V dc to +4 V dc. The logarithmic scaling is such that the output is +0.5 V for a sinusoidal input of -75 dBm and +3.5 V at an input of +5 dBm; over this range the logarithmic linearity is typically within ±0.4 dB. All scaling parameters are proportional to the supply voltage.

The AD606 can operate above and below these limits, with reduced linearity, to provide as much as 90 dB of conversion range. A second low-pass filter automatically nulls the input off-set of the first stage down to the submicrovolt level. Adding external capacitors to both filters allows operation at input frequencies as low as a few hertz.

The AD606's limiter output provides a hard-limited signal output as a differential current of ±1.2 mA from open-collector outputs. In a typical application, both of these outputs are loaded by 200 (Ohm) resistors to provide a voltage gain of more than 90 dB from the input. Transition times are 1.5 ns, and the phase is stable to within ±3° at 10.7 MHz for signals from -75 dBm to +5 dBm.

The logarithmic amplifier operates from a single +5 V supply and typically consumes 65 mW. It is enabled by a CMOS logic level voltage input, with a response time of <5 µs. When disabled, the standby power is reduced to <1 mW within 5 µs.

The AD606J is specified for the commercial temperature range of 0°C to +70°C and is available in 16-pin plastic DIPs or SOICs. Consult the factory for other packages and temperature ranges.

An evaluation board is available for this product and may be ordered using the following product number: AD606-EB.

Features

  • Logarithmic Amplifier Performance
    -75 dBm to +5 dBm Dynamic Range
    ≤1.5 nV/vHz Input Noise
    Usable to >50 MHz
    37.5 mV/dB Voltage Output
    On-Chip Low-Pass Output Filter
  • Limiter Performance
    ±1 dB Output Flatness over 80 dB Range
    ±3° Phase Stability at 10.7 MHz over
    80 dB Range
    Adjustable Output Amplitude
  • Low Power
    +5 V Single Supply Operation
    65 mW Typical Power Consumption
    CMOS-Compatible Power-Down to
    325 µW typ
    <5 µs Enable/Disable Time

Diagrams

AD606 Diagram
Functional Block Diagram for AD606

Specifications

Dynamic Range (dB) 80dB
Phase Accuracy (deg) ±3Deg
Response Time (ns typ) 400ns
Voltage Supply (V) 4.5 to 5.5
Supply Current (max) 13mA
Limiter Output Yes
AC Linearity (± dB) 1.5dB
Power Consumption (mW) 65mW
Package 16-Lead DIP,16-Lead SOIC

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Part# Product Description RF Frequency (MHz) Dynamic Range (dB) Temp Stability (dB) Response Time (ns typ) Voltage Supply (V) Supply Current (max) Package Price* (1000-4999)
AD606 Limiter Output - 80 - 400 4.5 to 5.5 13 16-Lead DIP, 16-Lead SOIC $22.00
AD640 Military Specified Part Available - 50 ±1 10 +/- 4.5 to +/- 7.5 44 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC $36.48
AD641 Military Specified Part Available - 44 ±1 10 +/- 4.5 to +/- 7.5 44 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC $32.82
AD8302 Dual-Channel Gain and Phase Outputs 2,700 60 ±1 60 2.7 to 5.5 19 14-Lead TSSOP $12.14
AD8306 Military Specified Part Available 5 to 400 100 ±1 73 2.7 to 5.5 16 16-Lead SOP $14.67
AD8307 High Dynamic Range dc to 500 92 ±1 400 2.7 to 5.5 8 8-Lead SOIC/DIP $6.07
AD8309 Limiter Output 5 to 500 100 ±1 67 2.7 to 5.5 16 16-Lead TSSOP $7.84
AD8310 High Dynamic Range dc to 440 100 ±1 15 2.7 to 5.5 8 8-Lead SOIC $4.00
AD8311 Low Power for Battery Operation 100 to 2500 50 ±0.5 150 2.7 to 5.5 8.5 WLCSP $1.27
AD8312 Low Power for Battery Operation 50 to 3500 45 ±0.5 70 2.7 to 5.5 4.2 WLCSP $1.27
AD8313 Industry Standard 100 to 2500 70 ±1.25 40 2.7 to 5.5 14 8-Lead uSOIC $7.99
AD8314 Industry Standard 100 to 2700 45 ±1 70 2.7 to 5.5 4.5 8-Lead uSOIC/CSP $1.10
AD8315 Low Power for Battery Operation 100 to 2500 50 ±1 150 2.7 to 5.5 8.5 8-Lead uSOIC $4.00
AD8317 Available in Die 1 to 10000 55 ±0.5 6 3 to 5.5 20 8-Lead CSP $3.98
AD8318 Integrated Temp Sensor 1 to 8000 70 ±0.5 10 4.5 to 5.5 68 16-Lead CSP $5.05
AD8319 Pin-compatible with AD8317 1 to 10000 45 ±0.5 6 3 to 5.5 22 8-Lead CSP $1.77
ADL5513 125°C Operation, Broadband