Document
BALFHB-WL-06D3
Datasheet
50 Ω nominal input / conjugate match balun to QFN-2L STM32WL in low power mode, 862-928 MHz with integrated harmonic filter
Product status BALFHB-WL-06D3
Features
• QFN STM32WL sub-GHz wireless microcontrollers impedance matched balun and Tx harmonics filter
• Optimized for QFN STM32WL sub-GHz wireless microcontrollers in low power mode and dedicated to 2-layers PCB
• 50 Ω nominal input / conjugate matched balun to QFN STM32WL • 50 Ω nominal impedance on antenna side Tx and Rx • Deep Tx rejection harmonic filter • Low insertion loss • Small footprint • Low profile ≤ 630 μm after reflow • High RF performance • RF BOM and area reduction • ECOPACK2 compliant component
Applications
• STM32WL sub-GHz wireless microcontrollers • LPWAN-compliant radio solution, enabling the following modulations: LoRa®,
(G)FSK, (G)MSK, and BPSK
Description
STMicroelectronics BALFHB-WL-06D3 is an ultra-miniature balun. This device integrates a matching network, balun, and harmonics filter. Matching impedance has been customized for the STM32WL sub-GHz wireless microcontrollers. It is using STMicroelectronics IPD technology on a nonconductive glass substrate, which optimizes RF performances.
DS14107 - Rev 2 - December 2022 For further information contact your local STMicroelectronics sales office.
www.st.com
BALFHB-WL-06D3
Characteristics
1
Characteristics
Table 1. Absolute maximum ratings (Tamb = 25 °C)
Symbol Parameter
PIN Input power RFIN
VESD
ESD ratings human body model (JESD22-A114), all I/O one at a time while others connected to GND
ESD ratings machine model, all I/O
TOP Operating temperature
Value 27
Unit dBm
2000 V
200
-40 to +105 °C
Table 2. Impedances (Tamb = 25 °C)
Symbol
Parameter
ZRX ZTX ZRX-ANT ZTX-ANT
Nominal differential Rx balun impedance Nominal Tx filter impedance Nominal Rx balun antenna impedance Nominal Tx filter antenna impedance
Min. -
Value Typ. Matched to STM32WL Matched to STM32WL 50 50
Unit Max.
-
Ω -
Table 3. Electrical characteristics and RF performances (Tamb = 25 °C)
Symbol
Parameter
f
Frequency range
ILRX
Rx balun insertion loss differential mode |SDS| without mismatch loss
ILTX LP Tx filter insertion loss |S21| without mismatch loss
RLRX-ANT
Rx balun input return loss differential mode |SDD| on antenna
RLTX-ANT Tx filter output return loss |S11| on antenna
ɸimb RX balun phase imbalance
Aimb RX balun amplitude imbalance
AttTX Tx filter harmonic rejection levels |S21|
Test condition
Value Unit
Min. Typ. Max. 862 868 928 MHz
Typical value given at 868 MHz
1.15 1.40 dB
Typical value given at 868 MHz
0.65 0.85 dB
Typical value given at 868 MHz 15 19
dB
Typical value given at 868 MHz 18 22
dB
-2.4
2.4 °
-0.7
0.7 dB
Attenuation at 2fo
35 37
Attenuation at 3fo
38 40
Attenuation at 4fo
41 50
Attenuation at 5fo
26 51
Attenuation at 6fo
34 47
dB
Attenuation at 7fo
20 45
Attenuation at 8fo
25 30
Attenuation at 9fo
28 34
Attenuation at 10fo
31 35
DS14107 - Rev 2
page 2/13
1.1
RF measurements (Rx balun)
Figure 1. Insertion loss (dB)
IL_RX
-1.00
-1.05
-1.10
-1.15
-1.20
-1.25
-1.30
-1.35
-1.40
-1.45
f(MHz)
-1.50
860
870
880
890
900
910
920
930
Figure 3. Amplitude imbalance (dB)
AMP_IMB
1.50
1.25
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
-1.25
f(MHz)
-1.50
860
870
880
890
900
910
920
930
BALFHB-WL-06D3
RF measurements (Rx balun)
Figure 2. Return loss on antenna (dB)
RL_RX_ANT
0
-5
-10
-15
-20
-25
-30
-35
f(MHz)
-40
860
870
880
890
900
910
920
930
Figure 4. Phase imbalance (°)
PHA_IMB
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
f(MHz)
-3.0
860
870
880
890
900
910
920
930
DS14107 - Rev 2
page 3/13
1.2
RF measurements (Tx filter)
Figure 5. Transmission wide band with harmonics attenuation (dB)
IL_TX
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
f(GHz)
-100
0
1
2
3
4
5
6
7
8
9 10 11
BALFHB-WL-06D3
RF measurements (Tx filter)
Figure 6. Insertion loss (dB)
IL_TX
-0.50
-0.55
-0.60
-0.65
-0.70
-0.75
-0.80
-0.85
-0.90
-0.95
f(MHz)
-1.00
860
870
880
890
900
910
920
930
Figure 7. Return loss on antenna (dB)
RL_TX_ANT
0
-5
-10
-15
-20
-25
-30
-35
f(MHz)
-40
860
870
880
890
900
910
920
930
DS14107 - Rev 2
page 4/13
BALFHB-WL-06D3
Package information
2
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark.
2.1
CSPG 8 bumps package information
Figure 8. CSPG 8 bumps package outline (bottom view - bumps up) (in µm)
Parameter A A1 A2 b D D1 D2 D3 D4 E E1 E2 E3 fD1 fD2 fE1 fE2
Table 4. CSPG 8 bumps dimensions (in µm)
Min. 580 180 380 230 2080
1780
Typ. 630 205 400 255 2130 340 50.