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Analog Devices Semiconductor Electronic Components Datasheet

AD8310 Datasheet

95 dB Logarithmic Amplifier

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AD8310 pdf
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
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
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
+INPUT
–INPUT
COMMON
VPOS
5 8mA
BAND GAP REFERENCE
AND BIASING
AD8310
ENBL 7 ENABLE
INHI
8
1.0kΩ
1 INLO
3
SIX 14.3dB 900MHz
AMPLIFIER STAGES
MIRROR
2μA
/dB
NINE DETECTOR CELLS
SPACED 14.3dB
2 COMM
2 3kΩ
COMM
BFIN 6 BUFFER
INPUT
+ VOUT
4 OUTPUT
3kΩ
1kΩ
INPUT-OFFSET
COMPENSATION LOOP
COMM
OFLT 3 OFFSET
33pF
FILTER
COMM
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 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.
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.
Rev. F
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2005–2010 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8310 Datasheet

95 dB Logarithmic Amplifier

No Preview Available !

AD8310 pdf
AD8310* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD8310 Evaluation Board
Documentation
Application Notes
• AN-1040: RF Power Calibration Improves Performance of
Wireless Transmitters
• AN-691: Operation of RF Detector Products at Low
Frequency
Data Sheet
• AD8310: Fast, Voltage-Out DC-440 MHz 95 dB
Logarithmic Amplifier Data Sheet
Product Highlight
• Industrial Applications
Tools and Simulations
• ADIsimPLL™
• ADIsimRF
• AD8310 SPICE Model
• AD8310 Sub Circuit
Reference Materials
Product Selection Guide
• RF Source Booklet
Technical Articles
• Design a Logamp RF Pulse Detector
• Detecting Fast RF Bursts using Log Amps
• Log Amps and Directional Couplers Enable VSWR
Detection
• Make Precise Base-Station Power Measurements
• Measurement and Control of RF Power, Part I
• Measurement and Control of RF Power, Part II
• Measurement and Control of RF Power, Part III
• Measuring the RF Power in CDMA2000 and W-CDMA
High Power Amplifiers (HPAs)
• Measuring VSWR and Gain in Wireless Systems
Tutorials
• Design and Operation of Automatic Gain Control Loops for
Receivers in Modern Communication Systems
Design Resources
• AD8310 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8310 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
Technical Support
Submit a technical question or find your regional support
number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.


Part Number AD8310
Description 95 dB Logarithmic Amplifier
Maker Analog Devices
Total Page 25 Pages
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