1 MHz to 10 GHz, 50 dB

Dual Log Detector/Controller

Preliminary Technical Data

ADL5519

Rev. PrB

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FEATURES

Wide bandwidth: 1 MHz to 10 GHz

Dual-channel and channel difference outputs ports

Integrated accurately scaled temperature sensor

50 dB dynamic range up to 8 GHz

Stability over temperature ±0.5 dB

Low noise measurement/controller output VOUT

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

Small footprint 5 mm x 5 mm LFCSP package

Supply operation: 3.0 V to 5.5 V @ 65 mA

Fabricated using high speed SiGe process

APPLICATIONS

RF transmitter PA setpoint control and level monitoring

Power monitoring in radiolink transmitters

RSSI measurement in base stations, WLAN, WiMAX, radar

Antenna VSWR monitor

Dual-channel wireless infrastructure radios

GENERAL DESCRIPTION

The ADL5519 is a dual-demodulating logarithmic amplifier,

using the AD8317 core. It has the capability of accurately

converting an RF input signal to a corresponding decibel-scaled

output. The ADL5519 provides accurately scaled, independent,

logarithmic outputs of both RF measurement channels.

Difference output ports, which measure the difference between

the two channels, are also available. The on-chip channel

matching makes the log-amp channel difference outputs

extremely stable with temperature and process variations. The

device also includes a useful temperature sensor with an

accurately scaled voltage proportional to temperature, specified

over the device operating temperature range.

The ADL5519 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 50 dB (re: 50 Ω) with error less

than ±1 dB. The ADL5519 has 8/10 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 65 mA, and it decreases to 1 mA when

the device is disabled.

The device is capable of supplying four log-amp measurements

simultaneously. Linear-in-dB measurements are provided at

OUTA and OUTB, with conveniently scaled slopes of -22

mV/dB. The log-amp difference between OUTA and OUTB is

available as differential or single-ended signals at OUTP and

OUTN. An optional voltage applied to VLVL provides a

common mode reference level to offset OUTP and OUTN

above ground. On-chip wide bandwidth output op amps are

connected to accommodate flexible configurations that support

many system solutions.

The ADL5519 can be easily configured to provide a control

voltage to a power amplifier at any output pin. Since the output

can be used for controller applications, special attention has

been paid to minimize wideband noise

The ADL5519 is fabricated on a SiGe bipolar IC process and is

available in a 5 mm × 5 mm, 32-lead LFCSP package for an

CHANNEL A

Log Detector

CHANNEL B

Log Detector

INHB

INLB

COMR

PWDN

INLA

INHA

OUTB

FBKB

OUTN

OUTP

FBKA

OUTA

BIAS

TEMP

OUTB

OUTA

25

26

27

28

29

30

31

32

COMR

COMR

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

25

26

27

28

29

30

31

32

NC

NC

Figure 1. Functional Block Diagram