DESCRIPTION
Demonstration circuit 1638A is a Mean-Squared Power
Detector with integrated 12-bit ADC featuring the
LTC®5587 IC.
The LTC5587 is a wide dynamic range Mean Squared
RF Power Detector, operational from 10MHz to 6GHz,
with sample rate up to 500ksps. The input dynamic
range at 2.14GHz, with ±1dB nonlinearity, is 40dB
(from –34dBm to +6dBm, single-ended 50 input).
The detector output, VOUT is also the input to the
internal ADC, the digital output slope is typically
70LSB/dB, and the typical output variation over
temperature is ±1dB at 2.14GHz.
LTC5587 has the internal 12-bit SPI compatible ADC.
DC1638A demonstrates the performance in
conjunction with DC590B Quick-Eval board. The
DC590B board samples the ADC at approximately
200Hz. Faster sampling rate is possible, contact LTC
applications for more information.
The 1638A Demo Circuit input is optimized for wide
frequency range of 1.75GHz to 2.2GHz. However,
input match can be shifted down to 10MHz or up to
6GHz with simple external matching.