Dual-channel filter streamlines design of ZigBee equipment
An integrated dual differential filter, which can replace up to 16 discrete surface-mount components and save 35mm2 of PCB area in ZigBee RF4CE equipment, has been introduced by STMicroelectronics. Suitable for STBs, TVs, home gateways, alarms and lighting, the DLPF-GP-01D3 allows designers to simplify board layout, reduce product size, or add new functions.
The dual differential filter is an impedance-matched companion chip for the popular GreenPeak GP540 and GP561 RF4CE communication controllers. These controllers enable low-cost single-layer PCB integration, supported by the DLPF-GP-01D3 pinning that allows short, straight tracks for signal, ground and common connections between the two devices.
The two integrated filter channels provide high attenuation outside the 2400-2500MHz frequency range and have low in-bandwidth insertion and return loss. ST has achieved this high performance, which helps designers meet the ZigBee RF4CE specifications, by leveraging its Integrated Passive Device technology with non-conductive glass substrate for superior signal integrity.
By enabling a single-chip solution, the DLPF-GP-01D3 also simplifies circuit design and saves BOM costs. The small 1.2x3.4mm footprint, and height of less than 560μm after reflow, make this the smallest dual low-pass filter solution on the market for the GreenPeak GP540 and GP561. The entire filter can now be built in less than one tenth of the PCB space of a conventional discrete circuit.
The DLPF-GP-01D3 is available now in an 11-bump flip-chip package, priced from $0.23 each and sold in 5000 unit quantities.
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