FEATURES

Wide bandwidth: 1 MHz to 10 GHz

High accuracy: ±1.0 dB over temperature

>40 dB dynamic range up to 8 GHz

Stability over temperature ±0.5 dB

Low noise measurement/controller output VOUT

Pulse response time: 8 ns/10 ns (fall/rise)

Small footprint 2 mm × 3 mm LFCSP_VD

Supply operation: 3.0 V to 5.5 V @ 22 mA

Fabricated using high speed SiGe process

APPLICATIONS

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 of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8319 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 40 dB (re: 50 Ω) with error less than ±1 dB. The AD8319 has 8 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 μA when the device is disabled.

TYPICAL PERFORMANCE CHARACTERISTICS

VPOS = 3 V; T = 25°C, −40°C, +85°C; CLPF = 1000 pF; unless otherwise noted. Colors: 25°C  Black; −40°C  Blue; +85°C  Red. Error is calculated by using the best-fit line between PIN = −40 dBm and PIN = −10 dBm at the specified input frequency, unless otherwise noted.

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