Wide Dynamic Range Log Amplifier Enhances Sensitivity of RF Power Measurements

LTC News for Immediate Release
For more information, tel. 408-432-1900
Doug Dickinson, Media Relations Mgr., ext. 2233
John Hamburger, Dir., Mkting Comm., ext. 2419
www.linear.com
Wide Dynamic Range Log Amplifier Enhances
Sensitivity of RF Power Measurements
MILPITAS, CA – August 25, 2005 - A new high performance log detector from Linear
Technology has superior sensitivity, allowing more accurate measurement of lower levels of
RF and IF signals. The LT5537 has a wide operating frequency range from near DC to 1GHz.
It features a measurement dynamic range of 90dB, enabling wide operating range for
receivers in such applications as Automatic Gain Control (AGC) loops. Additionally the
device offers exceptional accuracy over temperature, making it suitable for wireless
basestations, access points, subscriber radios, and RF instrumentation subject to a wide range
of environmental conditions.
The LT5537 incorporates a cascading chain of limiting amplifiers to provide a
constant, linear 20mV/dB logarithmic detection function. Additionally, the device
incorporates on-chip compensation circuitry to yield an accurate and stable output under
varying temperature environments. The device can measure signals within an error of +/-1dB
over the worst-case temperature extremes. Moreover, the device has superior sensitivity,
capable of detecting RF signal levels as low as -82dBm, significantly better than comparably
priced competitive parts. On the high side, the device can measure up to +12dBm input levels.
The LT5537 operates from a single supply voltage ranging from 2.7V to 5.25V.
Typical operating current is 13.5mA. The device can be shut down by applying an external
0V into an ENBL pin. When disabled, the chip typically draws 500uA quiescent current to
conserve power. The LT5537 is offered in an 8-lead 3mm x 2mm surface mount DFN
package. The device requires fewer external components than alternative solutions, providing
a compact, cost effective solution. It is priced at $2.95 each in 1,000-piece quantities and is
available from stock.
(more...)
Wide Dynamic Range Log Amplifier Enhances
Sensitivity of RF Power Measurements
Page 2
Summary of Features: LT5537
•
•
•
•
•
Frequency Range
Dynamic Range
Accurate Over Temperature
Sensitivity
Small Form Factor
Low Frequency to 1GHz
90 dB
+/-1dB
- 82dBm
3mm x 2mm DFN Package
About Linear Technology Corporation
Linear Technology Corporation, a manufacturer of high performance linear integrated
circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500
index of major public companies in 2000. Linear Technology products include high
performance amplifiers, comparators, voltage references, monolithic filters, linear regulators,
DC-DC converters, battery chargers, data converters, communications interface circuits, RF
signal conditioning circuits, and many other analog functions. Applications for Linear
Technology’s high performance circuits include telecommunications, cellular telephones,
networking products such as optical switches, notebook and desktop computers, computer
peripherals, video/multimedia, industrial instrumentation, security monitoring devices, highend consumer products such as digital cameras and MP3 players, complex medical devices,
automotive electronics, factory automation, process control, and military and space systems.
For more information, visit www.linear.com
Contact:
Doug Dickinson, Media Relations Manager
Linear Technology Corporation
1630 McCarthy Boulevard
Milpitas, CA 95035-7417
[email protected]
408-432-1900
READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company’s web site:
http://www.linear.com
Note: LT, LTC and
are registered trademarks of Linear Technology Corp.
###