AD8310ARMZ-REEL1 Analog Devices, AD8310ARMZ-REEL1 Datasheet

AD8310ARMZ-REEL1

Manufacturer Part Number

AD8310ARMZ-REEL1

Description

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

Manufacturer

Analog Devices

Datasheet

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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–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

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

GENERAL DESCRIPTION

The AD8310 is a complete, dc–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 CMOS-

compatible enable pin is provided.

Each of the six cascaded amplifier/limiter cells has a small-

signal 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 µV, 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 supply-

and temperature-independent.

Rev. D

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

COMMON

The fully differential input offers a moderately high impedance

(1 kΩ in parallel with about 1 pF). A simple network can match

the input to 50 Ω 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 greater at 440 MHz. There is no minimum frequency

limit; the AD8310 can be used down to low audio frequencies.

Special filtering features are provided to support this wide

range.

The output voltage runs from a noise-limited lower boundary

of 400 mV to an upper limit within 200 mV of the supply

voltage for light loads. The slope and intercept can be readily

altered using external resistors. The output is tolerant of a wide

variety of load conditions and is stable with capacitive loads of

100 pF.

The AD8310 provides a unique combination of low cost, small

size, low power consumption, high accuracy and stability, high

dynamic range, a frequency range encompassing audio to UHF,

fast response time, and good load-driving capabilities, making

this product useful in numerous applications that require the

reduction of a signal to its decibel equivalent.

The AD8310 is available in the industrial temperature range of

–40°C to +85°C in an 8-lead MSOP package.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

Fast, Voltage-Out DC–440 MHz,

SUPPLY

+INPUT

–INPUT

95 dB Logarithmic Amplifier

VPOS

INHI

INLO

1.0kΩ

COMM

FUNCTIONAL BLOCK DIAGRAM

8mA

NINE DETECTOR CELLS

COMPENSATION LOOP

SPACED 14.3dB

INPUT-OFFSET

BAND GAP REFERENCE

SIX 14.3dB 900MHz

AMPLIFIER STAGES

AND BIASING

Figure 1.

MIRROR

2µA

3kΩ

COMM

AD8310

COMM

www.analog.com

1kΩ

–

AD8310

COMM

3kΩ

33pF

ENBL

VOUT

OFLT

BFIN

ENABLE

BUFFER

INPUT

OUTPUT

OFFSET

FILTER

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