BALF-SPI-01D3
50
Ω
nominal input / conjugate match balun to SPIRIT1,
with integrated harmonic filter
Datasheet
production data
Features
50
Ω
nominal input / conjugate match to
SPIRIT1
Low insertion loss
Low amplitude imbalance
Low phase imbalance
Flip-Chip package 6 bumps
Small footprint
Benefits
Figure 1. Pin coordinates (top view)
Very low profile (< 670
μm)
High RF performance
RF BOM and area reduction
Applications
868 MHz and 915 MHz impedance matched
balun filter
Optimized for SPIRIT1 sub GHz RFIC
Description
Figure 2. Application schematic (top view)
STMicroelectronics BALF-SPI-01D3 is an ultra
miniature balun. The BALF-SPI-01D3 integrates
matching network and harmonics filters. Matching
impedance has been customized for the SPIRIT1
ST transceiver.
The BALF-SPI-01D3 uses STMicroelectronics
IPD technology on non-conductive glass
substrate which optimize RF performance.
November 2015
This is information on a product in full production.
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12
Characteristics
BALF-SPI-01D3
1
Characteristics
Table 1. Absolute maximum ratings (limiting values)
Value
Symbol
P
IN
V
ESD
T
OP
Input power RFIN
Parameter
Min.
Typ.
-
2000
200
-40
-
-
-
+85
Max.
20
Unit
dBm
V
°C
ESD ratings human body model (JESD22-A114-C), all I/O one at a
time while others connected to GND
ESD ratings machine model, all I/O
Operating temperature (JESD22-A115-C), all I/O
Table 2. Impedances (T
amb
= 25 °C)
Value
Symbol
Z
RX
Z
TX
Z
ANT
Parameter
Min.
Nominal differential RX balun impedance
Nominal TX filter impedance
Antenna impedance
-
-
Typ.
match to SPIRIT1
50
Max.
-
-
Ω
Ω
Unit
Table 3. RF performance (T
amb
= 25 °C)
Value
Symbol
F
S21
RX-ANT
S21
TX-ANT
S11
ANT
S11
ANT
Parameter
Frequency range (bandwidth)
Insertion loss in bandwidth
without mismatch loss (RX balun)
Insertion loss in bandwidth
without mismatch loss (TX filter)
Input return loss in bandwidth (RX balun)
Input return loss in bandwidth (TX filter)
Output phase imbalance (RX balun)
Output amplitude imbalance (RX balun)
Harmonic levels (TX filter)
Attenuation at 2fo
Attenuation at 3fo
5
Test condition
Min.
779
Typ.
868
-1.7
-1.4
-23
-15
10
0.35
-35
-40
Max.
956
-2
-2
-15
-12
15
0.8
MHz
dB
dB
dB
dB
°
dB
dBm
Unit
imb
A
imb
Att
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DocID025035 Rev 5
BALF-SPI-01D3
Characteristics
1.1
RF measurement (Rx balun)
Figure 3. Insertion loss (T
amb
= 25 °C)
Figure 4. Return loss antenna (T
amb
= 25 °C)
Figure 5. Phase imbalance (T
amb
= 25 °C)
Figure 6. Amplitude imbalance (T
amb
= 25 °C)
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Characteristics
BALF-SPI-01D3
1.2
RF measurement (Tx filter)
Figure 7. Transmission (T
amb
= 25 °C)
Figure 8. Insertion loss (T
amb
= 25 °C)
Figure 9. Attenuation (T
amb
= 25 °C)
Figure 10. Return loss antenna (T
amb
= 25 °C)
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DocID025035 Rev 5
BALF-SPI-01D3
Application information
2
Application information
Figure 11. Application board EVB (4 layers)
Figure 12. TX output measurements with BALF-SPI-01D3 at 868 MHz
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