The BAL-2690D3U is a 50/30+j25 balun transformer for the 2.45 GHz ISM band. Its features are 50 Ohm nominal input/30+j25 output differential impedance, low insertion loss, low amplitude imbalance and low phase imbalance. This transformer has a small footprint and high power density and is suitable for applications such as Bluetooth and mobile phones.
The BAL-2690D3U is a flip-chip balun transformer manufactured using STMicroelectronics IPD technology on a non-conductive glass substrate. It is specifically customized for use with the STLC2690 Bluetooth transceiver, featuring a very low profile of less than 700 micrometers to reduce RF BOM and area.
| Nominal input impedance | 50 Ω |
|---|---|
| Nominal differential output impedance | 30 + j25 Ω |
| Frequency range (bandwidth) | 2402 to 2480 MHz |
| Insertion loss in bandwidth | Typ. 0.8 dB, Max. 1.1 dB |
| Operating temperature range | -40 to +85 °C |
| Package type | Flip-Chip |
It is designed to transform single-ended signals to differential signals in Bluetooth applications, specifically customized for the STLC2690 transceiver.
The absolute maximum rating for input power is 20 dBm.