GENERAL DESCRIPTION

The ADL5519 is a dual-demodulating logarithmic amplifier that incorporates two AD8317s. It can accurately convert an RF input signal into a corresponding decibel-scaled output. The ADL5519 provides accurately scaled, independent, logarithmic output voltages for both RF measurement channels. The device has two additional output ports, OUTP and OUTN, that provide the measured differences between the OUTA and OUTB channels. The on-chip channel matching makes the log amp outputs insensitive to temperature and process variations.

FEATURES

Wide bandwidth: 1 MHz to 10 GHz

Dual-channel and channel difference output ports

Integrated accurate scaled temperature sensor

62 dB dynamic range (±3 dB)

>50 dB with ±1 dB up to 8 GHz

Stability over temperature: ±0.5 dB (−40°C to +85°C)

Low noise detector/controller outputs

Pulse response time: 6 ns/8 ns (fall time/rise time)

Supply operation: 3.3 V to 5.5 V @ 60 mA

Fabricated using high speed SiGe process

Small footprint, 5 mm × 5 mm, 32-lead LFCSP

Operating temperature range: −40°C to +125°C

APPLICATIONS

RF transmitter power amplifier linearization and

gain/power control

Power monitoring in radio link transmitters

Dual-channel wireless infrastructure radios

Antenna VSWR monitor

RSSI measurement in base stations, WLAN, WiMAX, radar