ST BAL-2593D5U User Manual
50 / 50+j50 balun transformer for 2.45 GHz ISM band
Features
■ 50 Ω nominal Input / 50+j50 output differential
impedance
■ Low insertion loss
■ Low amplitude imbalance
■ Low phase imbalance
■ Small footprint: BAL-2593D5U < 1.5 mm²
Benefits
BAL-2593D5U
Flip Chip
4 bumps
■ Very low profile (<700 µm)
■ High RF performances
■ RF components count and area reduction
Application
■ Bluetooth balun for STL2592/2593/2500D
transceiver
■ Portable applications
Description
The BAL-2593D5U is a balun designed to
transform a single ended signal to differential
signals in Bluetooth applications.
This BAL-2593D5U, with less than 1.2 dB
insertion losses in the bandwidth 2400 MHz to
2500 MHz, has been customized for
STLC2592/2593/2500D Bluetooth transceivers
and specific requirements for S
2f0 (4.88 GHz).
The BAL-2593D5U has been designed using
STMicroelectronics IPD (integrated passive
device) technology on non conductive glass
substrate to optimize RF performances.
parameter at
CC22
Figure 1. Top view
A1
B1B2
DescriptionBump
RF balanced ouput
Ground
RF balanced ouput
RF input
A1
A2
B1
B2
A2
Name
BALGND
BAL+
SE
Figure 2. Application schematic
WLAN
PA
+ SP3T
2.4G
Antenna
Band
Pass
Filter
BT
Balun
BT
RFIC
TM: IPAD is a trademark of STMicroelectronics.
October 2009 Doc ID 16008 Rev 1 1/8
www.st.com
8
Electrical characteristics BAL-2593D5U
1 Electrical characteristics
Table 1. Absolute maximum ratings (limiting values)
Symbol Test condition Min. Typ. Max. Unit
P
IN
Input power R
FIN
-10dBm
ESD ratings MIL STD883C
V
(HBM: C = 100 pF, R = 1.5kΩ , air discharge)
ESD ratings machine model
ESD
(MM: C = 200 pF, R = 25 Ω, L = 500 nH)
ESD ratings, charged device model
1000
200
500
--V
(JESD22-C101D)
T
Table 2. Electrical characteristics (T
Operating temperature -30 - +85 °C
OP
= 25 °C) impedances
amb
Symbol Test condition Min. Typ. Max. Unit
Z
Z
Table 3. RF performance (T
Nominal differential output impedance - 50 + j50 - Ω
OUT
Nominal input impedance - 50 - Ω
IN
= 25 °C)
amb
Symbol Test condition Min. Typ. Max. Unit
F Frequency range (bandwidth) 2400 - 2500 MHz
I
Insertion loss in bandwidth - 1.0 1.2 dB
L
R
Return loss in bandwidth 10 17 - dB
L
Φ
A
Phase imbalance
imb
Amplitude imbalance -2 - 2 dB
imb
Measured on EVB with
GND on L1
0620°
2/8 Doc ID 16008 Rev 1
BAL-2593D5U Electrical characteristics
Figure 3. Insertion loss (T
-0.50
-0.75
-1.00
-1.25
-1.50
2.30E9
2.35E9
2.45E92.40E9
Figure 5. Amplitude imbalance (T
2
= 25 °C) Figure 4. Return loss (T
amb
2.55E92.50E9
freq. Hz
= 25 °C) Figure 6. Phase imbalance (T
amb
-8
-10
-12
-14
-16
-18
-20
2.70E92.65E92.60E9
-22
2.30E9
20
2.35E9
2.45E92.40E9
amb
2.55E92.50E9
= 25 °C)
= 25 °C)
amb
freq. Hz
2.70E92.65E92.60E9
1
0
-1
-2
2.30E9
2.35E9
Figure 7. S
freq. Hz
freq. Hz
2.55E92.50E9
= 25 °C),
amb
dd22
2.45E92.40E9
@ f0 (T
freq (2.4000 GHz to 2.500 GHz)
50 + j50
2.70E92.65E92.60E9
15
10
5
0
2.30E9
2.35E9
Figure 8. S
freq. Hz
2.55E92.50E9
= 25 °C),
amb
cc22
2.45E92.40E9
@ 2f0 (T
freq (4.8000 GHz to 5.000 GHz)
2.70E92.65E92.60E9
Doc ID 16008 Rev 1 3/8
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