DC to 6 GHz, 45 dB TruPwr

Detector with Envelope Threshold Detection

Data Sheet

ADL5904

Rev. 0

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FEATURES

RMS and envelope threshold detection

Broad input frequency range: dc to 6 GHz

RF input range: 45 dB (−30 dBm to +15 dBm)

RMS linear in decibel output, scaled 36.5 mV/dB

Input envelope threshold detection and latching

Programmable threshold and latch reset function

Fast response time: 12 ns from RFIN to Q/Q latch

All functions temperature and supply stable

Operates at 3.3 V from −40°C to +105°C

Low power: 3.5 mA

Power-down capability to 100 µA

16-lead, 3 mm × 3 mm LFCSP package

APPLICATIONS

Transmitter signal strength indication (TSSI)

Wireless power amplifier input and output protection

Wireless receiver input protection

FUNCTIONAL BLOCK DIAGRAM

R

ENVELOPE

DETECTOR

RMS

+

–

Q

S

ADL5904

VPOS

GND

VRMS

RST

Q

RFIN

VIN–

DECL

ENBL

CRMS

Q

1

11

DNC

2

3

6

8

4

4

5

7

12

13

Q

10

9

16

15

VCAL

Figure 1.

GENERAL DESCRIPTION

The ADL5904 is a dual-function radio frequency (RF) TruPwr™

detector that operates from dc to 6 GHz. It provides rms power

measurement along with a programmable envelope threshold

detection function.

The rms power measurement function has a 45 dB detection

range, nominally from −30 dBm to +15 dBm. The rms power

measurement function features low power consumption and an

intrinsically ripple free error transfer function.

The envelope threshold detection function compares the voltage

from an internal envelope detector with a user defined input

voltage. When the voltage from the envelope detector exceeds

the user defined threshold voltage, an internal comparator

captures and latches the event to a set/reset (SR) flip flop. The

response time from the RF input signal exceeding the user

programmed threshold to the output latching is 12 ns. The latched

event is held on the flip-flop until a reset pulse is applied.

The RF input of the ADL5904 is dc-coupled, allowing operation

down to arbitrarily low ac frequencies. It operates on a 3.3 V

supply and consumes 3.5 mA. A disable mode reduces this

current to 100 µA when a logic low is applied to the ENBL pin.

The ADL5904 is supplied in a 3 mm × 3 mm, 16-lead LFCSP for

operation over the wide temperature range of −40°C to +105°C.