1 MHz to 10 GHz, 62 dB Dual Log

Detector/Controller

Data Sheet

ADL5519

Rev. B

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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

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

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

FUNCTIONAL BLOCK DIAGRAM

CHANNEL A

LOG DETECTOR

CHANNEL B

LOG DETECTOR

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

25

26

27

28

29

30

31

32

INHA

INHB

INLB

COMR

COMR

PWDN

COMR

INLA

16

15

14

13

12

11

10

9

NC

NC

OUTB

FBKB

OUTN

OUTP

FBKA

OUTA

BIAS

TEMP

OUTA

OUTB

ADL5519

Figure 1.

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 volt-

ages 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.

The temperature sensor pin provides a scaled voltage that is

proportional to the temperature over the operating temperature

range of the device.

The ADL5519 maintains accurate log conformance for signals

from 1 MHz to 8 GHz and provides useful operation to 10 GHz.

The ±3 dB dynamic range is typically 62 dB and has a ±1 dB

dynamic range of >50 dB (re: 50 Ω). The ADL5519 has a response

time of 6 ns/8 ns (fall time/rise time) that enables RF burst detec-

tion to a pulse rate of greater than 50 MHz. The device provides

unprecedented logarithmic intercept stability vs. ambient

temperature conditions. A supply of 3.3 V to 5.5 V is required

to power the device. Current consumption is typically 60 mA,

and it decreases to less than 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 differ-

ential 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. The broadband output

pins can support many system solutions.

Any of the ADL5519 output pins can be configured to provide

a control voltage to a variable gain amplifier (VGA). Special

attention has been paid to minimize the broadband noise of the

output pins so that they can be used for controller applications.

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

available in a 5 mm × 5 mm, 32-lead LFCSP with an operating

temperature range of −40°C to +125°C.