GENERAL DESCRIPTION

The ADL5507 is a complete, low-power, wide-band logarithmic RF

power detector for the measurement of RF signals in the 10 MHz to

12 GHz frequency range. The device is optimized for accurate RF

signal level measurements over a 55 dB dynamic range, from −56

dBm to −1 dBm at 3.6 GHz, when terminated with 50 Ω. It provides

a wider dynamic range and better accuracy than is possible using

discrete diode detectors. Its high sensitivity allows measurement of

low power levels, thus reducing the amount of power that needs to

be coupled to the detector.

For convenience, the signal input is internally AC-coupled, using a

series 25 pF capacitor. Therefore, the source can be DC grounded.

A broadband 50 Ω match is obtained with an external 51 Ω shunt

resistor. This high-pass coupling, with a corner at approximately 4

MHz, determines the lowest operating frequency.

The DC voltage at the ADL5507 output interface responds linearin-

dB to the RF signal level applied at its input. It is accurately

temperature compensated to provide typically better than ±1 dB

measurement accuracy over the full case operating temperature

range from −40°C to +105°C. The output interface has sufficient

capability to drive a wide range of analog‐to‐digital converters

(ADCs) and other circuitry.

The CFLT interface enables additional ripple and noise filtering of

the output signal, without reducing the drive capability of the VLOG

interface. This is achieved by connecting a capacitor between the

CFLT and VLOG interfaces.

The tri-state ENBL interface switches the device between active

positive output slope mode, active negative output slope mode, and

a low-power shutdown mode. In positive output slope mode, the

ADL5507 output increases approximately from 0.1 V to 1.2 V as the

input signal level increases from 0.35 mV rms (−56 dBm) to 200 mV

rms (−1 dBm). In negative output slope mode, the output decreases

approximately from 1 V to 0 V as the input signal level decreases

from 200 mV rms (−1 dBm) to 0.35 mV rms (−56 dBm). The output

interface becomes high impedance in shutdown to avoid discharge

of external filter capacitors.

The ADL5507 is available in a 6-ball WLCSP package and consumes

12.5 mA from a 3.3 V supply. In shutdown mode, the typical

disable supply current is <100 μA.

FEATURES

► Complete RF detector function

► Wide operating frequency range from 10 MHz to 12 GHz

► Stable linear-in-decibel response

► 55 dB dynamic range (±1 dB error at 3.6 GHz RF input)

► Excellent temperature stability, ±1 dB typical

► Positive/negative output slope response controlled by ENBL Pin

► Power on/off response time: 2.5 μs/200 ns (rise/fall)

► Operates from −40°C to +105°C

► Low power: 12.5 mA at 3.3 V

► Disable current <100 μA

► Power supply voltage range from 2.7 V to 3.45 V

APPLICATIONS

► RSSI and TSSI for wired and wireless terminal devices

► RF transmitter or receiver power measurement

► Wide-band Automatic Gain Control