DC1638A

DC1638A is a demo board for LTC5587 6GHz RMS power detector with digital output. 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.

• 1638A demo circuit input is optimized for wide frequency range of 1.75GHz to 2.2GHz
• Input match can be shifted down to 10MHz or up to 6GHz with simple external matching
• VDD supply voltage range from 2.7V to 3.6V
• VCC supply voltage range from 2.7V to 3.6V (should be equal to VDD)
• 3mA total supply current at No RF input signal, ADC operational at 500Ksps
• 0.2μA shutdown current at EN = 0.3V, CONV=3.3V, ADC sleep-mode
• 0.18V output detector voltage (VOUT) at no input signal present
• 1μs rise time(1000pF on VOUT) at 0.2V to 1.6V, 10% to 90%, FRF = 2140MHz
• 8μs fall time(1000pF on VOUT) at 1.6V to 0.2V, 90% to 10%, FRF = 2140MHz

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