Date: 02/12/2010

15GHz RF detector with fast response time of 7 ns

Linear Technology introduces the LTC5564, a precision RF power detector that operates from 600MHz to 15GHz, with fast response time of 7ns from a pulsed RF signal. LTC5564 has an on-chip fast comparator with a propagation delay of 9ns. The comparator threshold voltage is user-settable, enabling a flexible trip point. The device's output may be latched by asserting a latch-enable pin, permitting a fast capture of a short-duration, single-event signal or a fault condition.

The LTC5564 can measure RF input signals from -24dBm to +16dBm. This dynamic range is provided by a programmable gain output amplifier with four gain settings, which are digitally controlled by two logic input pins that are binary-weighed. Thus improved sensitivity can be achieved when measuring low level signals. Moreover, the output amplifier is bandwidth capable of demodulating the envelope of an RF modulated signal up to 75MHz. The detector incorporates temperature compensation circuitry, enabling repeatable and stable RF power measurements under varying environmental conditions.

The LTC5564 targets applications such as microwave communications, telemetry, radar detectors, RF power amplifier monitoring and fault detection, automatic level control, test instrumentation and cellular networks.

The LTC5564 can be powered from a single 3.3V or 5V supply. Normal operation draws a nominal current of 44mA. The device is rated for operation from -40°C to 85°C. The LTC5564 is offered in a small 3mm x 3mm 16-pin QFN package. Pricing starts at $2.90 each in 1,000 piece quantities.