The ICs comprise Integrated Passive Devices fabricated using ST’s proven IPD-on-glass process, which delivers more predictable RF performance compared to other integrated baluns; some of which require additional external matching components.
The BAL-2593D5U is optimized for use with the STLC2500D standalone Bluetooth transceiver and STLC2592/3 combo devices, which implement an FM radio tuner enabling users to listen to radio directly on a Bluetooth headset. The BAL-2690D3U is designed to partner the STLC2690, a Bluetooth /FM-tuner combo that also adds a short-range FM transmitter allowing the user to play stored music through a system such as a car radio.
Key features of ST’s integrated baluns:
BAL-2593D5U:
* 50/50+j50 Ohm impedance
* 1.16 x 1.26mm footprint; sub-0.7mm profile
* 1.2dB insertion loss
* Matches STLC2592/3, STLC2500D
BAL-2690D3U:
* 50/30+j25 Ohm impedance
* 0.91 x 0.91mm footprint; sub-0.7mm profile
* 0.8dB insertion loss
* Matches STLC2690