SAW Components
SAW RX filter
Automotive telematics
Series/type:
Ordering code:
Date:
Version:
B4328
B39182B4328P810
July 04, 2013
2.0
©
EPCOS AG 2013. Reproduction, publication and dissemination of this data sheet, enclosures
hereto and the information contained therein without EPCOS’ prior express consent is prohibited.
SAW Components
SAW RX filter
Data sheet
Application
s
Low-loss RF filter for LTE and
s
s
s
s
s
B4328
1842.5 MHz
WCDMA Band III receive path (RX)
Suitable for diversity applications
High TX suppression
Useable passband: 75 MHz
Unbalanced to balanced operation
Impedance transformation from 50
Ω
to 100
Ω
Package size 1.4 x 1.1 x 0.4
Package code QCS5P
RoHS compatible
Approximate weight 0.003g
Package for
Surface Mount Technology
(SMT)
Ni, gold-plated terminals
AEC-Q200 qualified component family (operable
temperature range -40˚C to +85˚C)
s
Electrostatic Sensitive Device
(ESD)
s
s
s
s
s
s
s
mm
3
0.325
2 3
1
0.575
Features
0.25
bottom view
5
0.5 0.5
0.4
4
side view
1.4
1.1
top view
Pin configuration
s
1
s
3,4
s
2,5
Input
Output balanced
To be grounded
1
4
3
2,5
Please read
cautions and warnings and
important notes
at the end of this document.
2
July 04, 2013
SAW Components
SAW RX filter
Data sheet
Characteristics band III performance
Temperature range for specification:
Terminating source impedance:
Terminating load impedance:
T = -20 ˚C to +85 ˚C
Z
S
= 50
Ω
|| 7.0 nH
Z
L
= 100
Ω
|| 9.0 nH + 2x2.2 pF
min.
Center frequency
Maximum insertion attenuation
1805.0 ... 1880.0
@f
Carrier Bd 3 RX
1807.4 ... 1877.6
Amplitude ripple
(p-p)
1805.0 ... 1880.0
Error Vector Magnitude
2)
@f
Carrier Bd 3 RX
1807.4 ... 1877.6
Input VSWR
1805.0
Output VSWR
1805.0
... 1880.0
... 1880.0
MHz
MHz
MHz
α
100.0
115.0
1615.0
1690.0
1710.0
1712.4
1785.0
1920.0
1965.0
3515.0
...
...
...
...
...
...
...
...
...
...
115.0
1615.0
1690.0
1710.0
1785.0
1782.6
1790.0
1965.0
3515.0
3665.0
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
45
42
41
36
37
37
8
15
30
40
130
52
47
44
40
41
35
22
35
55
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
—
—
23
1.6
1.6
28
2.0
2.0
—
dB
MHz
MHz
MHz
MHz
f
C
α
CW
α
WCDMA
1)
∆α
EVM
—
—
—
—
—
typ.
@ 25 ˚C
1842.5
2.2
1.9
1.2
1.7
max.
—
3.4
2.8
2.3
3.0
MHz
dB
dB
dB
%
B4328
1842.5 MHz
CMRR
(|S
21
-S
31
| / |S
21
+S
31
|)
1805.0 ... 1880.0
Attenuation
@f
Carrier Bd 3 TX
α
WCDMA
1)
1)
2)
Attenuation of WCDMA signal (“Powertransferfunction”). Please refer to annotation on page (4).
Error Vector Magnitude (EVM) for WCDMA signal based on definition given in 3GPP TS 25.141.
Please read
cautions and warnings and
important notes
at the end of this document.
3
July 04, 2013
SAW Components
SAW RX filter
Data sheet
Annotation for characteristics section
Attenuation of WCDMA signal (“Powertransferfunction”,
α
WCDMA
) is determined by
B4328
1842.5 MHz
∫
∞
∞
S
ds 21
(
f
)H
RRC
(
f – f
Carrier
)
df
2
f
Carrier
according to 3GPP TS 25.101 (e.g. for band III RX passband, f
Carrier
ranges from 1807.4
MHz (lowest RX channel) to 1877.6 MHz (highest RX channel)). H
RRC
(f) is the transfer function
of the root-raised cosine transmit pulse shaping filter according to 3GPP TS 25.101 with the fol-
lowing normalization:
∫
∞
∞
H
RRC
(
f
)
df = 1
2
Matching topology proposal for improved VSWR in 50/100Ω environment
Input: L
P
=7.0 nH
Output (balanced): L
P
=9.0 nH, C
S
=2.2 pF
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
Input power
T
T
stg
V
DC
P
IN(TX)
P
IN
–40/+85
–40/+85
0
15
12
˚C
˚C
V
dBm
dBm
CW@55˚C, 10000h, Bd III TX band
CW@55˚C, 10000h, all other bands
Please read
cautions and warnings and
important notes
at the end of this document.
4
July 04, 2013
SAW Components
SAW RX filter
Data sheet
B4328
1842.5 MHz
ESD protection of SAW filters
SAW filters are
Electro Static Discharge
sensitive devices. To reduce the probability of damages
caused by ESD, special matching topologies have to be applied. In general, “ESD matching” has to
be ensured at that filter port, where electrostatic discharge is expected.
Electrostatic discharges predominantly appear at the antenna input of RF receivers. Therefore only
the input matching of the SAW filter has to be designed to short circuit or to block the ESD pulse.
Below three figures show recommended “ESD matching” topologies.
For wideband filters the high-pass ESD matching structure needs to be at least of 3
rd
order to
ensure a proper matching for any impedance value of antenna and SAW filter input. The required
component values have to be determined from case to case.
Cs1
Cs3
Cs1
Cs3
MLC1
Dp1
Lp2
to output
matching
Lp2
to output
matching
Fig. 1 MLC varistor plus ESD matching
Fig. 2 Suppressor diode plus ESD matching
In cases where minor ESD occur, following simplified “ESD matching” topologies can be used
alternatively.
Cs1
Cs3
Lp2
to output
matching
Fig. 3 3
rd
order high-pass structure for basic ESD protection
In all three figures the shunt inductor Lp2 could be replaced by a shorted microstrip with proper
length and width. If this configuration is possible depends on the operating frequency and available
pcb space.
Effectiveness of the applied ESD protection has to be checked according to relevant industry
standards or customer specific requirements.
For further information, please refer to EPCOS Application report:“ESD protection for SAW filters”.
This report can be found under www.epcos.com/rke. Click on “Application Notes”.
Please read
cautions and warnings and
important notes
at the end of this document.
5
July 04, 2013
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