Power Detector offers adjustable offset and gain.
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Press Release Summary:
Model LTC5532 RF Power Detector monitors and controls applications in wireless communication transceivers. It has on-chip, temperature-compensated Schottky diode for RF detection and is factory trimmed to measure RF signals from 300 MHz to 7 GHz. RF input signal range is -32 to +8 dBm. Model LTC5532 employs peak-detection architecture, providing stable DC output voltage as function of RF input power. It can be powered from 2.7-6 V supply and draws 500 µA.
Original Press Release:
7GHz RF Power Detector with Offset & Gain Adjustment Add Flexibility and Precision to Wireless Systems
MILPITAS, CA - October 27, 2003 - Linear Technology Corporation introduce the LTC5532, a precision RF power detector designed for monitoring and control applications in wireless communication transceivers. The LTC5532 is an integrated device that is factory trimmed to accurately measure RF signals from 300MHz to 7GHz, suitable for equipment including the 802.11a, b, and g WiFi systems, 5.8GHz WAN and WLAN radios and other licensed band transceivers. Its RF input signal range extends from -32dBm to +8dBm. The LTC5532 has an on-chip temperature compensated Schottky diode for RF detection. It employs a peak-detection architecture, providing a stable DC output voltage as a function of the RF input power.
Unique to the LTC5532 are adjustable offset and gain, increasing design flexibility. The starting output voltage can be user-adjusted, while the gain slope can be set by using two external resistors to match any analog-to-digital converter for improved measurement accuracy and resolution. The two adjustments are mutually independent. Additionally, the gain-adjustable amplifier can be configured as a threshold comparator for applications such as RF presence detectors and RF power alarms.
The LTC5532 can be powered from a single 2.7V to 6V supply. It draws only 500 microampere of current, and is suitable for battery operated portable applications.
Besides its applicability in the 900MHz and 1.9GHz cellular and PCS infrastructure, the LTC5532's 7GHz capability opens new uses in the 5.2GHz to 5.8GHz bands, including 802.11 multi-band a, b, and g, WLAN and WiFi applications. Additional uses include both the 3.5GHz and the 2.5GHz - 2.7GHz MMDS licensed bands, as well as cable infrastructure equipment, in which RF power level control is important.
The LT5532 is offered in a tiny 6-lead ThinSOT-23 package, consuming a small PC board space. Pricing starts at $2.00 each in 1,000-piece quantities.
Summary of Features: LTC5532
Wide Input Frequency Range: 300MHz to 7GHz
Wide Input Power Range: -32dBm to +8dBm
Temperature Compensated Internal Schottky Diode RF Detector
Buffered Detector Output with User-Settable Gain Control
Precision Output Offset Control
Low operating current: 500µA
Wide Power Supply Range of 2.7V to 6V
Low Profile (1mm) SOT-23 Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators, power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequency devices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
