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Linear Technology’s RF power detector targets WiMAX

Linear Technology's LT5538 is a monolithic broadband, logarithmic RF power detector that operates in the 2.6 GHz and 3.5 GHz WiMAX bands.

Within its measurement dynamic range, the LT5538 delivers accuracy and linearity of ±0.8dB over its rated operating temperature range of −40 to +85°.
Its DC output voltage is log-linearly proportional to its input power level.

The LT5538 handles 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.

The LT5538 detects signals from -75dBm to +10dBm at 2.14GHz. The device operates with a single-ended RF input and requires no external RF transformer.

The LT5538 features output response of 100ns rise time and 200ns fall time. It operates over a voltage range of 3V to 5.25V, drawing a quiescent supply current of 29mA. 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 1μA, and a maximum of 100μA.

Pricing starts at $4.50 each in 1,000-piece quantities and is available immediately.

More information is available at www.linear.com.

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