Analog Devices Inc. DC489A-B

Overview

DC489A-B from Analog Devices (formerly Linear Technology) is a demonstration board designed to evaluate the LTC5507 RF power detector IC, which provides DC output voltage proportional to RF input power across 100 kHz–1000 MHz, with 16 dBm max input, 260 mV quiescent Vout, and enable/shutdown control via JP1.

For engineers reviewing the DC489A-B datasheet, DC489A-B pinout, DC489A-B application, or DC489A-B equivalent, this board supports rapid characterization of RF power detection linearity, shutdown timing, and frequency-dependent capacitor selection (e.g., 39 pF at 800–1000 MHz), with SMA RF input, test points for Vcc, Vout, SHDN, and ground.

Technical Context

The DC489A-B implements direct evaluation of the LTC5507's logarithmic response to RF input, using on-board test points (E1–E5, J1) and configurable jumper JP1 to assert logic HIGH/LOW to the SHDN pin. It supports both continuous and pulsed operation modes via E4.

Capacitor selection (C1, C4) is frequency-tuned: 0.1 µF for 100 kHz–1 MHz, ≤0.01 µF for higher frequencies, and 39 pF recommended at 800–1000 MHz to maintain detector accuracy and impedance matching at RF input.

Key Specifications

Availability

DC489A-B is available at Aetrix Electronics and suitable for RF test bench validation, wireless transceiver calibration, and production-line RF power detector qualification requiring stable component supply and documented evaluation infrastructure.

Supply support for DC489A-B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices designs high-performance analog, mixed-signal, and RF ICs for precision signal conditioning, power management, and connectivity applications.

The DC489A-B belongs to Linear Technology's legacy demo board family, engineered specifically to accelerate evaluation of RF power detectors like the LTC5507 in lab and pre-production environments.

FAQ

What is the purpose of the DC489A-B demo board?

The DC489A-B demo board is a dedicated evaluation platform for the LTC5507 RF power detector. It provides immediate access to all critical signals - RF input (J1), Vout (E2), supply (E1), ground (E3/E5), and shutdown (E4) - enabling fast, repeatable measurement of detector output linearity, frequency response, and enable/disable timing without custom PCB design.

How do I enable or disable the LTC5507 using the DC489A-B?

Enable or disable the LTC5507 on the DC489A-B by positioning jumper JP1: left position applies logic HIGH (via 22 kΩ pull-up to VCC) to enable the IC; right position connects SHDN to ground for shutdown. Alternatively, drive E4 directly with a pulse generator (50 Ω terminated) while JP1 is in the enable position to characterize turn-on delay.

Which capacitors should I use on the DC489A-B for 900 MHz RF evaluation?

For 900 MHz RF evaluation on the DC489A-B, replace C1 and C4 with 39 pF capacitors as specified in the Quick Start Guide. This value optimizes high-frequency bypassing and maintains detector accuracy within the 800–1000 MHz band, unlike the default 0.1 µF parts intended for sub-MHz testing.

Can the DC489A-B be used with a 50 Ω RF signal generator?

Yes, the DC489A-B accepts 50 Ω RF input via the SMA connector J1. The guide recommends inserting a 3 dB pad in series to minimize reflections into the signal generator - a standard practice for accurate source impedance matching and stable RF power delivery to the LTC5507 on the DC489A-B.

Does the DC489A-B include the LTC5507 IC installed?

Yes, the DC489A-B ships with the LTC5507 RF power detector IC pre-mounted and fully functional. All supporting components - including configurable jumper JP1, test points E1–E5, SMA RF input J1, and selectable decoupling capacitors C1/C4 - are assembled and verified for immediate evaluation of the LTC5507's performance per its datasheet specifications.