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AD8313ARM-REEL

0.1 GHz to 2.5 GHz 70 dB Logarithmic Detector/Controller

Analog Devices 

Data Sheet

0.1 GHz to 2.5 GHz 70 dB

Logarithmic Detector/Controller

AD8313

FEATURES

Wide bandwidth: 0.1 GHz to 2.5 GHz min

High dynamic range: 70 dB to ±3.0 dB

High accuracy: ±1.0 dB over 65 dB range (@ 1.9 GHz)

Fast response: 40 ns full-scale typical

Controller mode with error output

Scaling stable over supply and temperature

Wide supply range: 2.7 V to 5.5 V

Low power: 40 mW at 3 V

Power-down feature: 60 mW at 3 V

Complete and easy to use

APPLICATIONS

RF transmitter power amplifier setpoint control and level

monitoring

Logarithmic amplifier for RSSI measurement cellular base

stations, radio link, radar

GENERAL DESCRIPTION

The AD8313 is a complete multistage demodulating logarithmic

amplifier that can accurately convert an RF signal at its input to

an equivalent decibel-scaled value at its dc output. The AD8313

maintains a high degree of log conformance for signal frequencies

from 0.1 GHz to 2.5 GHz. Application is straightforward,

requiring only a single supply of 2.7 V to 5.5 V and the addition

of a suitable input and supply decoupling. Operating on a 3 V

supply, its 13.7 mA consumption (for TA = 25°C) is only 41 mW.

A power-down feature is provided; the input is taken high to

initiate a low current (20 µA) sleep mode, with a threshold at

half the supply voltage.

The AD8313 is fabricated on Analog Devices, Inc., advanced

25 GHz silicon bipolar IC process and is available in an 8-lead

MSOP package. The operating temperature range is −40°C to

+85°C.

VPOS 1

INHI 2

INLO 3

VPOS 4

FUNCTIONAL BLOCK DIAGRAM

NINE DETECTOR CELLS

+

+

+

+

+ I→V

8 VOUT

8dB

8dB

CINT

8dB

8dB LP V→I

EIGHT 8dB 3.5GHz AMPLIFIER STAGES

AD8313

INTERCEPT

CONTROL

7 VSET

6 COMM

SLOPE

CONTROL

BAND GAP

REFERENCE

GAIN

BIAS

5 PWDN

Figure 1.

Table 1. Next Generation Upgrades for AD8313

Part Number Comments

ADL5513

Improved range and temperature stability,

operation up to 4 GHz

AD8318

Improved temperature stability, operation up

to 8 GHz

AD8317

Lower input range, improved temperature

stability, operation up to 10 GHz

AD8319

Lower input range, improved temperature

stability, operation up to 10 GHz

2.0

5

FREQUENCY = 1.9GHz

1.8

4

1.6

3

1.4

2

1.2

1

1.0

0

0.8

–1

0.6

–2

0.4

–3

0.2

–4

0

–5

–80 –70 –60 –50 –40 –30 –20 –10

0

INPUT AMPLITUDE (dBm)

Figure 2. Typical Logarithmic Response and Error vs. Input Amplitude

Rev. E

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