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

FEATURES Logarithmic Amplifier Performance –75 dBm to +5 dBm Dynamic Range ≤1.5 nV/√Hz 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 ␮W typ <5 ␮s Enable/Disable Time

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 offset 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 Ω 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.

APPLICATIONS Ultrasound and Sonar Processing Phase-Stable Limiting Amplifier to 100 MHz Received Signal Strength Indicator (RSSI) Wide Range Signal and Power Measurement

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.

PRODUCT DESCRIPTION

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.

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

FUNCTIONAL BLOCK DIAGRAM INHI

COMM

PRUP

VPOS

FIL1

FIL2

LADJ

LMHI

16

15

14

13

12

11

10

9

REFERENCE AND PO WER UP

30pF

360kΩ

X1 360kΩ

30pF

30kΩ

30kΩ

OFFSET-NULL LOW-PASS FILTER

1.5kΩ

12µA/dB 1.5kΩ

FINAL LIMITER

MAIN SIGNAL PATH 11.15 dB/STAGE

250Ω

9.375kΩ

HIGH-END DETECTORS ONE-POLE FILTER

AD606

2pF

9.375kΩ

2 µ A/dB

TWO-POLE SALLEN-KEY FILTER X2

2pF

1

2

3

4

5

6

7

8

INLO

COMM

ISUM

ILOG

BFIN

VLOG

OPCM

LMLO

REV. 0 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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