EMI Filtering And Signal Conditioning
BAL-2690D3U
50 / 30+j25 balun transformer for 2.45 GHz ISM band
Features
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50 Ω nominal input / 30+j25 output d...
Description
BAL-2690D3U
50 / 30+j25 balun transformer for 2.45 GHz ISM band
Features
■ ■ ■ ■ ■
50 Ω nominal input / 30+j25 output differential impedance Low insertion loss Low amplitude imbalance Low phase imbalance Small footprint: BAL-2690D3U < 1 mm²
Flip Chip 4 bumps
Benefits
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Very low profile (<700 µm) High RF performances RF BOM and area reduction
GND
Figure 1.
Top view
Top View
Applications
Balun transformer for applications such as:
■ ■
A2 A2
A1 A1
ZC C
BAL -
Bluetooth STLC2690 Mobile phone
SE B2 B2 B1 B1 BAL +
Description
The BAL-2690D3U is a balun designed to www.DataSheet4U.com transform single ended signals to differential signals in Bluetooth applications. The BAL-2690D3U has been customized for the STLC2690 Bluetooth transceiver with 0.8 dB insertion losses in the bandwidth (2400 MHz - 2500 MHz) and with a specific requirement for the SCC22 parameter. The BAL-2690D3U has been designed using STMicroelectronics IPD (integrated passive device) technology on non conductive glass substrate to optimize RF performances.
Bump Name Description A1 A2 B1 B2 BALGND BAL+ SE
RF balanced ouput Ground RF balanced ouput RF input
Figure 2.
Application schematic
WLAN PA + SP3T
2.4G Antenna
Band Pass Filter
BT Balun
BT RFIC
TM: IPAD is a trademark of STMicroelectronics.
January 2010
Doc ID 16056 Rev 1
1/8
www.st.com 8
Electrical characteristics
BAL-2690D3U
1
Electrical characteristics
Table 1.
Symbol PIN Input power RFIN ESD ratings MIL STD883C (HBM: C = 100 pF, ...
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