DEMO CIRCUIT 1638A LTC5587 QUICK START GUIDE LTC5587 6GHz RMS Power Detector with 12-bit Digital Output DESCRIPTION Demonstration circuit 1638A is a Mean-Squared Power LTC5587 has the internal 12-bit SPI compatible ADC. DC1638A demonstrates the performance in Detector with integrated 12-bit ADC featuring the conjunction with DC590B Quick-Eval board. The LTC 5587 IC. DC590B board samples the ADC at approximately The LTC5587 is a wide dynamic range Mean Squared 200Hz. Faster sampling rate is possible, contact LTC RF Power Detector, operational from 10MHz to 6GHz, applications for more information. with sample rate up to 500ksps. The input dynamic The 1638A Demo Circuit input is optimized for wide range at 2.14GHz, with 1dB nonlinearity, is 40dB frequency range of 1.75GHz to 2.2GHz. However, (from 34dBm to +6dBm, single-ended 50 input). input match can be shifted down to 10MHz or up to The detector output, VOUT is also the input to the 6GHz with simple external matching. internal ADC, the digital output slope is typically 70LSB/dB, and the typical output variation over Design files for this demo board are available. Call temperature is 1dB at 2.14GHz. the LTC factory. LTC is a trademark of Linear Technology Corporation Typical Performance Summary (V = V = OV = 3.3V, EN=3.3V, V =1.8V, V =ADC OUTPUT(LSB) *1.8/4096,T = 25C, unless otherwise A CC DD DD REF OUT noted. Test circuit shown in Figure 1.) PARAMETER CONDITION TYPICAL VALUE OV Supply Voltage 1.0 to V DD DD V Supply Voltage 2.7V to 3.6V DD V Supply Voltage Should be equal to V 2.7V to 3.6V CC DD V Reference Voltage 1.4 to V +0.05V REF DD Total Supply Current No RF input signal, ADC operational at 500ksps 3mA Shutdown Current EN = 0.3V, CONV=3.3V, ADC Sleep-Mode 0.2A Low, Chip Disabled 0.3V max EN Voltage HIGH, Chip Enabled 2V min V = 0V 0A EN EN Input Current V = 3.3V 20A EN Output Detector Voltage, V No Input Signal Present 0.18V OUT Rise Time(1000pF on V ) 0.2V to 1.6V, 10% to 90%, F = 2140 MHz 1s RF OUT Fall Time(1000pF on V ) 1.6V to 0.2V, 90% to 10%, F = 2140 MHz 8s RF OUT Input Frequency Range With external matching components 10MHz to 6GHz f = 880MHz RF Input Power Range CW input: Externally Matched to 50 Source -34 to 6 dBm Linear Dynamic Range, CW 1 dB linearity error 40 dB Output Slope 73LSB/dB Logarithmic Intercept -42dBm 1 L TC5587 Output Variation vs Temperature P = -34 to +6dBm 1 dB IN Deviation from CW Response EDGE 3/8 Shifted 8PSK, P = -34 to +6dBm 0.1 dB IN f = 2140MHz RF Input Power Range CW input: Externally Matched to 50 Source -34 to 6 dBm Linear Dynamic Range, CW 1 dB linearity error 43 dB Output Slope 73 LSB/dB Logarithmic Intercept -42dBm Output Variation vs Temperature P = -34 to +6dBm 1 dB IN Deviation from CW Response 12 dB peak-to-average ratio (4 carrier WCDMA) 0.5 dB F=3500MHz Linear Dynamic Range, CW 1 dB linearity error 36dB Slope 73LSB/dB Logarithmic Intercept -40dBm Output Variation vs Temperature P = -30 to +6dBm 1 dB IN Deviation from CW Response WiMAX OFDM Burst P = -34 to +4dBm 0.5dB IN ADC Resolution ADC Resolution (no missing code) 12 bits Differential Linearity Error EN=0V, Voltage on V =0V to 1.8V, V=1.8V 0.25 OUT REF Measurement Resolution 1LSB= V /(4096*29mV/dB), V=1.8V 15mdB REF REF Table 1. Jumper Description for DC1638A JUMPER FUNCTION RANGE/SETTING (DEFAULT) JP1 VDD, ADC power supply voltage 3.3V JP2 VREF, ADC reference input voltage VREG=1.8V JP3 OVDD, ADC output driver supply voltage 3.3V DC590B QUICK START PROCEDURE The DC590B is a USB controller board that allows PC to 2. Set VCCIO on DC590B to 3.3V on the USB communicate through serial data interface. The Quick controller board. start guide for DC590B can be found here: 3. Set the JP4, the EN, which will enable the