Tunable bandpass filter covers 30 to 520 MHz
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By
Jean-Pierre Joosting
The SAX239 offers an industry-leading combination of power handling (+33 dBm) and DC power consumption (<100 mW) in a small form factor. The device also features low insertion loss and fast-tuning across the band to 1.0 MHz resolution.
The tunable bandpass filter is designed for tactical communications applications and offers full environmental qualification, including vehicular (to MIL-STD-810G, Method 514.6) and jet fighter (to MIL-STD-810F, Method 514.5G).
An associated evaluation board includes the filter and the interface required to allow control from any PC.
Key features of the SAX239 include:
- Insertion loss: < 4.5 dB (typical) over the full 30–520 MHz band;
- Step size: 1.0 MHz (30–88 MHz) and 2.0 MHz (90–520 MHz);
- Tuning control: Serial [SPI];
- Tuning speed: 40 µs (maximum) / 25 µs (typical);
- IIP3: +45 dBm;
- Bandpass bandwidth: 3.5% typical;
- Bandpass VSWR: 1.5:1 typical: 2.0:1 maximum;
- Dimensions: 1.2 x 1.2 x 0.25 inches.
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