ADMV8526 Digitally Tunable Band-Pass Filter

ADI's ADMV8526 is a single tunable filter IC with both center frequencies and passband bandwidth that can be configured through simple serial peripheral interface (SPI) command on-the-fly in the system. Its compact form factor and flexible tunability simplify system design and reduce engineering development time. ADMV8526 provides the benefits of low SWaP-C in various applications.

The filter center frequency (fCENTER) can be adjusted from 1.25 GHz to 2.60 GHz, using an 8-bit value (256 states) incorporating a patent-pending interpolation technique.

The typical 3 dB bandwidth is 9%, and adjustability is ±2%. Insertion loss is typically 4 dB, and the 20 dB rejection is 16% away from fCENTER, ideally suited for minimizing system interferers. This tunable filter can be used as a smaller alternative to large switched filter banks and discrete component-based tunable filters, and this device provides a dynamically adjustable solution in advanced communications applications.

The ADMV8526-EVALZ is available for evaluating the ADMV8526 digitally tunable band-pass filter (BPF). The ADMV8526-EVALZ incorporates the ADMV8526 chip, as well as a negative voltage generator, low dropout (LDO) regulators, and an interface to the EVAL-SDP-CS1Z (SDP-S) system demonstration platform (SDP) to allow simple and efficient evaluation. The negative voltage generator and LDO regulators allow the ADMV8526 to be powered by either the 5 V USB supply voltage from the PC via the SDP-S or by two external power supplies.

The ADMV8526 is an IC that features a digitally selectable frequency of operation. The chip can be programmed using a 4-wire SPI, and the SDP-S controller allows the user to interface with the SPI of the ADMV8526 through the Analog Devices, Inc., Analysis, Control Evaluation (ACE) software.

Features

• Compact 10 mm x 10 mm, 40-lead LGA package
• Flexible and reconfigurable band-pass filter configurations with fast RF switching speed
• Low insertion loss for RF front-end applications and low residual phase noise performance