40MHz to 3.8GHz Log RF Power Detector Features 75dB Dynamic Range
The LT5538's dynamic range performance is ideal for RF power amplifier power control and monitoring for a wide range of wireless systems, as well as receiver AGC (Automatic Gain Control), and RSSI (Receive Signal Strength Indicator) functions. These are required functions for cellular basestations of all types, including large cells, microcells, picocells, and femtocells, wireless repeaters, WiMAX basestations, broadband wireless access points, broadband cable networks, military and commercial long-range radios, as well as test and measurement instrumentation. The LT5538's accuracy performance helps to minimize equipment calibration requirements, resulting in stable system performance and reduced operating costs.
The LT5538 utilizes Linear Technology's high speed bipolar process, enabling wide bandwidth and dynamic range performance. The fast output response of 100ns rise time and 200ns fall time to rapidly changing RF input signal levels make it suitable for rapid measurement of RF signal power in TDD (Time Division Duplexing) switching wireless operating environments, including WiMAX, TD-SCDMA, and other applications.
The LT5538 operates over a wide supply voltage range of 3V to 5.25V, drawing a low quiescent supply current of 29mA compared to other similar class detectors. A shutdown feature is provided. When the chip is disabled with a logic LOW applied to its ENABLE input pin, the chip draws a typical shutdown current of 1uA, and a maximum of 100uA. The device comes in a tiny 8-lead, 3mm x 3mm DFN surface mount package. Pricing starts at $4.50 each in 1,000-piece quantities. The LT5538 is available immediately from stock.
LINEAR TECHNOLOGY GmbH
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, uModule(TM) products, 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, high-end 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.
LT, LTC, LTM, Burst Mode and are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
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