Datasheet AD8319 (Analog Devices)

1 MHz to 10 GHz, 45 dB Log Detector/Control er Data Sheet AD8319 FEATURES FUNCTIONAL BLOCK DIAGRAM Wide bandwidth: 1 MHz to 10 GHz VPOS TADJ High accuracy: ±1.0 dB over temperature GAIN 45 dB dynamic range up to 8 GHz SLOPE BIAS I V VSET Stability over temperature: ±0.5 dB Low noise measurement/controller output VOUT I V VOUT Pulse response time (fall/rise): 6 ns/10 ns DET DET DET DET Small footprint: 2 mm × 3 mm LFCSP CLPF INHI Supply operation: 3.0 V to 5.5 V @ 22 mA Fabricated using high speed SiGe process INLO
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APPLICATIONS
Figure 1.
RF transmitter PA setpoint controls and level monitoring Power monitoring in radiolink transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars GENERAL DESCRIPTION
The AD8319 is a demodulating logarithmic amplifier, capable The feedback loop through an RF amplifier is closed via VOUT, of accurately converting an RF input signal to a corresponding the output of which regulates the output of the amplifier to a decibel-scaled output. It employs the progressive compression magnitude corresponding to VSET. The AD8319 provides 0 V to technique over a cascaded amplifier chain, each stage of which (VPOS − 0.1 V) output capability at the VOUT pin, suitable for is equipped with a detector cell. The device can be used in either control er applications. As a measurement device, VOUT is measurement or controller modes. The AD8319 maintains external y connected to VSET to produce an output voltage, accurate log conformance for signals of 1 MHz to 8 GHz and VOUT, that is a decreasing linear-in-dB function of the RF input provides useful operation to 10 GHz. The input dynamic range signal amplitude. is typically 45 dB (re: 50 Ω) with error less than ±3 dB. The The logarithmic slope is −22 mV/dB, determined by the VSET AD8319 has 6 ns/10 ns (fal time/rise time) response time that interface. The intercept is 15 dBm (re: 50 Ω, CW input) using enables RF burst detection to a pulse rate of beyond 50 MHz. the INHI input. These parameters are very stable against supply The device provides unprecedented logarithmic intercept stability and temperature variations. vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typical y The AD8319 is fabricated on a SiGe bipolar IC process and is 22 mA, and it decreases to 200 µA when the device is disabled. available in a 2 mm × 3 mm, 8-lead LFCSP for an operating temperature range of −40°C to +85°C. The AD8319 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention was paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION USING THE AD8319 BASIC CONNECTIONS INPUT SIGNAL COUPLING OUTPUT INTERFACE SETPOINT INTERFACE TEMPERATURE COMPENSATION OF OUTPUT VOLTAGE MEASUREMENT MODE SETTING THE OUTPUT SLOPE IN MEASUREMENT MODE CONTROLLER MODE OUTPUT FILTERING OPERATION BEYOND 8 GHz EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE