Smallest single-chip dual-channel filter simplifies ZigBee remote designs

March 11, 2015 // By Graham Prophet
STMicroelectronics’ DLPF-GP-01D3 integrated dual differential filter can replace up to 16 discrete surface-mount components and save 35mm² of pc-board area in ZigBee RF4CE remote controls for equipment such as set-top boxes, TVs, home gateways, alarms, and lighting.

The DLPF-GP-01D3 is an impedance-matched companion chip for the GreenPeak GP540 and GP561 RF4CE communication controllers. These controllers enable low-cost single-layer pc-board 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 2400-2500 MHz 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, with its Integrated Passive Device (IPD) technology with non-conductive glass substrate for signal integrity.

By enabling a single-chip solution, the DLPF-GP-01D3 also simplifies circuit design and saves costs. The 1.2 x 3.4 mm footprint, and height of less than 560 μm after reflow, make this the smallest dual low-pass filter solution for the GreenPeak GP540 and GP561. The entire filter can now be built in less than 1/10th the pc-board space of a conventional discrete circuit, and the DLPF-GP-01D3, in an 11-bump flip-chip package, is priced from $0.23 (5000).