1 MHz to 10 GHz, 62 dB Dual Log
Detector/Controller
ADL5519
Data Sheet
ADJA
VPSR
TEMP
CLPA
VSTA
23
22
21
20
19
18
17
ADL5519
TEMP
16 NC
INHA 25
INLA 26
15 OUTA
CHANNEL A
LOG DETECTOR
14 FBKA
COMR 27
PWDN 28
COMR 29
COMR 30
13 OUTP
OUTA
OUTB
12 OUTN
11 FBKB
CHANNEL B
LOG DETECTOR
10 OUTB
9 NC
INHB 32
3
4
5
6
7
8
VPSB
ADJB
VREF
VLVL
CLPB
VSTB
06198-001
2
COMR
BIAS
1
COMR
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
VPSA
24
INLB 31
APPLICATIONS
COMR
FUNCTIONAL BLOCK DIAGRAM
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 (−40oC to +85oC)
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: −40oC to +125oC
COMR
FEATURES
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 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.
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 detection to a pulse rate of greater than 50 MHz. The device provides
unprecedented logarithmic intercept stability vs. ambient
Rev. B
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 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. 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.
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