Datasheet ADL5904 (Analog Devices)

DC to 6 GHz, 45 dB TruPwr Detector with Envelope Threshold Detection Data Sheet ADL5904 FEATURES FUNCTIONAL BLOCK DIAGRAM RMS and envelope threshold detection ENBL VPOS VIN– RST 4 5 7 16 15 Broad input frequency range: dc to 6 GHz RF input range: 45 dB (−30 dBm to +15 dBm) ADL5904 R Q 12 Q – RMS linear in decibel output, scaled 36.5 mV/dB S Q 13 Q Input envelope threshold detection and latching + Programmable threshold and latch reset function ENVELOPE Fast response time: 12 ns from RFIN to Q/Q latch RFIN 1 DETECTOR RMS 10 VRMS All functions temperature and supply stable Operates at 3.3 V from −40°C to +105°C
001
11 3 9 4 2 6 8 Low power: 3.5 mA GND VCAL CRMS DECL DNC
13838-
Power-down capability to 100 µA
Figure 1.
16-lead, 3 mm × 3 mm LFCSP package APPLICATIONS Transmitter signal strength indication (TSSI) Wireless power amplifier input and output protection Wireless receiver input protection GENERAL DESCRIPTION
The ADL5904 is a dual-function radio frequency (RF) TruPwr™ the user defined threshold voltage, an internal comparator detector that operates from dc to 6 GHz. It provides rms power captures and latches the event to a set/reset (SR) flip flop. The measurement along with a programmable envelope threshold response time from the RF input signal exceeding the user detection function. programmed threshold to the output latching is 12 ns. The latched The rms power measurement function has a 45 dB detection event is held on the flip-flop until a reset pulse is applied. range, nominal y from −30 dBm to +15 dBm. The rms power The RF input of the ADL5904 is dc-coupled, allowing operation measurement function features low power consumption and an down to arbitrarily low ac frequencies. It operates on a 3.3 V intrinsical y ripple free error transfer function. supply and consumes 3.5 mA. A disable mode reduces this The envelope threshold detection function compares the voltage current to 100 µA when a logic low is applied to the ENBL pin. from an internal envelope detector with a user defined input The ADL5904 is supplied in a 3 mm × 3 mm, 16-lead LFCSP for voltage. When the voltage from the envelope detector exceeds operation over the wide temperature range of −40°C to +105°C.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS THEORY OF OPERATION BASIC CONNECTIONS FOR RMS MEASUREMENT CHOOSING A VALUE FOR CRMS VRMS CALIBRATION AND ERROR CALCULATION BASIC CONNECTIONS FOR THRESHOLD DETECTION Q AND QB RESPONSE TIME SETTING THE VIN− THRESHOLD DETECTION VOLTAGE APPLICATIONS INFORMATION EVALUATION BOARD SCHEMATIC AND CONFIGURATION OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE