Datasheet LTC5587 (Analog Devices)

LTC5587 6 GHz RMS Power Detector with Digital Output
FEATURES DESCRIPTION
n Frequency Range: 10MHz to 6GHz The LTC®5587 is a 10MHz to 6GHz, low power monolithic n Accurate Power Measurement of High Crest Factor precision RMS power detector with an integrated 12-bit (Up to 12dB) Waveforms serial analog-to-digital converter (ADC). The RMS detec- n 40dB Log Linear Dynamic Range tor uses a proprietary technique to accurately measure the n Exceptional Accuracy Over Temperature RF power of modulated signals with crest-factor as high n Single-Ended RF Input as 12dB. For an input frequency of 2.14GHz the detection n 0.014dB/Bit (12-Bit) ADC Resolution (V range is from –34dBm to 6dBm. The serial digital output REF = 1.8V) n ADC Sample Rate Up to 500ksps of the detector is a 12-bit word value that is directly pro- n SPI/MICROWIRE Serial I/O portional to the RF signal power measured in dBm. The n Compatible with 1V to 3.6V Digital Logic LTC5587 is suitable for precision power measurement n Fast Response Time: 1μs Rise, 8μs Fall for a wide variety of RF standards, including LTE, WiMAX, n Low Power: 3mA at 3.3V and 500ksps W-CDMA, TD-SCDMA, CDMA, CDMA2000, EDGE, GSM, n Small 3mm × 3mm 12-pin DFN Package etc. The DC output of the detector is connected in series with an on-chip 300Ω resistor to the analog output pin (VOUT). This enables further filtering of the output modu-
APPLICATIONS
lation ripple using an off-chip capacitor before analog-to- digital conversion. The ADC features include no data latency, n LTE, WiMAX, W-CDMA, TD-SCDMA, CDMA, no missing codes, and a sampling rate of up to 500ksps. A CDMA2000, EDGE, GSM dedicated external reference pin (V n REF) can be tied to VDD Pico-Cells, Femto-Cells RF Power Control or other suitable low-impedance voltage reference to set the n Wireless Repeaters ADC full-scale input voltage range. The ADC also features n CATV/DVB Transmitters an automatic power down after each conversion making n MIMO Wireless Access Points the LTC5587 ideal for low-power applications. n Portable RMS Power Measurement n Antenna Monitor L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
BLOCK DIAGRAM Linearity Error vs RF Input Power 2140MHz Modulated Waveforms
3 TA = 25°C 13 4 11 3 EXPOSED VOUT VDD OVDD 2 PAD OUTPUT BUFFER 150kHz LPF RF 300Ω 1 RMS 7 THREE-STATE SDO DETECTOR S/H 12-BIT ADC SERIAL OUTPUT 1 PORT 0 SCK –1 CW 2 BIAS TIMING WCDMA, UL LINEARITY ERROR (dB) CONV LOGIC WCDMA DL 1C 12 –2 WCDMA DL 4C C EN V GND V SQ CC REF LTE DL 1C 6 9 8 5 10 LTE DL 4C 5587 BD –3 –35 –30 –25 –20 –15 –10 –5 0 5 10 RF INPUT POWER (dBm) 5587 G12 5587f 1 Document Outline FEATURES DESCRIPTION APPLICATIONS BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM TIMING DIAGRAMS TEST CIRCUIT APPLICATIONS INFORMATION PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS