ATEK MIDAS has introduced a software-controlled, sub-octave filter bank or "preselector" that operates from 485-7700 MHz. ATEK1001 utilizes the ATEK MIDAS ATEK950AP6 IC. It provides filtering across seven fixed-frequency bands, has an off-chip bypass mode that can be used for full bypass or to engage additional external filtering.
This preselector is a versatile, highly useful tool for providing programmable bandpass filtering for a software-defined radio, among other applications. In the receive path, that filtering can be used to mitigate the effect of strong blocking signals. In the transmit path, it can be used to help reduce out-of-band radiation. ATEK1001 aims to provide an affordable filter bank for radio enthusiasts and SDR users.
ATEK950AP6 is a switchable, sub-octave bandpass filter bank with an external bypass that covers 485-7700 MHz, frequency bands. This filter bank consists of an SP8T switch followed by seven fixed-frequency bandpass filters followed by another SP8T switch. Both arms of each SP8T switch are used to send the input/output signals to two pins. This allows users to bypass the filter bank off-chip. Alternatively, additional off-chip filters or filter banks can be implemented using this bypass feature. The ATEK950AP6 chip is available for purchase in a 6 mm x 6 mm QFN-40 package.
Key features and specifications:
- Frequency range: 485-7700 MHz.
- External bypass: 2-8000 MHz, for additional off-chip filters or filter banks.
- Input IP3: 43 dBm.
- Sub-octave filter bank architecture: improves overall input IP2.
- Switching speed: 150 ns.
- Input/output resistance matching: 50 Ω.
- Package: QFN-40, 6 mm x 6 mm.
- Operating temperature: -40 to 85 °C.
- Operating voltage: 3.3 - 5 VDC.
- Current draw: ~15 mA.
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