IF Filters for Narrowband Cellular Phones
Series/Type:
B4874
The following products presented in this data sheet are being withdrawn.
Ordering Code
B39860B4874Z710
Substitute Product
Date of
Withdrawal
2003-03-07
Deadline Last
Orders
2003-07-31
Last Shipments
2003-09-30
For further information please contact your nearest EPCOS sales office, which will also support
you in selecting a suitable substitute. The addresses of our worldwide sales network are
presented at www.epcos.com/sales.
SAW Components
Data Sheet B4874
SAW Components
Low Loss Filter for Mobile Communication
Data Sheet
Features
s
s
s
s
s
s
s
B4874
85,38 MHz
Ceramic package
QCC10B
Low-loss IF filter for mobile telephone
Channel selection in AMPS/D-AMPS systems
Filter surface passivated
High stopband attenuation
Low insertion loss
Balanced or unbalanced operation possible
Package for
Surface Mounted Technology
(SMT)
Terminals
s
Ni, gold plated
Dimensions in mm, approx. weight 0,23 g
Pin configuration
10
5
9
4
1,3,6,8
2,7
Type
B4874
Input
Output
Balanced input or input ground
Balanced output or output ground
Case ground
Not connected
Ordering code
B39860-B4874-Z710
Marking and Package
according to
C61157-A7-A49
Electrostatic Sensitive Device
(ESD)
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
Source power
Packing
according to
F61064-V8035-Z000
T
T
stg
V
DC
P
s
– 30/+ 85
– 40/+ 85
13
10
˚C
˚C
V
dBm
2
May 08, 2001
SAW Components
Low Loss Filter for Mobile Communication
Data Sheet
Characteristics
Operating temperature range:
Terminating source impedance:
Terminating load impedance:
B4874
85,38 MHz
T
= -30˚C ... 85˚C
Z
S
= 1000
Ω
|| 2600 nH
Z
L
= 1000
Ω
|| 2600 nH
min.
Nominal frequency
3 dB Bandwidth
Minimum insertion attenuation
(including losses in the matching network)
Amplitude ripple
(p-p)
f
N
– 12,0 kHz ... f
N
+
Group delay ripple
(p-p)
f
N
– 12,0 kHz ... f
N
+
α
min
typ.
85,38
—
3,0
max.
—
—
4,5
MHz
kHz
dB
f
N
—
+-14
—
∆α
12,0 kHz
∆τ
12,0 kHz
α
rel
—
25
45
40
0,5
32
57
57
3,0
—
—
—
dB
dB
dB
dB
—
3,0
10,0
µs
—
0,3
1,5
dB
Relative attenuation
(relative to
α
min
)
f
N
±
14,0 kHz
f
N
±
60,0 kHz ... f
N
±
120,0 kHz
f
N
±
120,0 kHz
f
N
±
120,0 kHz ... f
N
±
2,5 MHz
Impedance
within the passband
Input:
Z
IN
=
R
IN
||
C
IN
Output:
Z
OUT
=
R
OUT
||
C
OUT
Temperature coefficient of frequency
1)
Turnover temperature
1)
Temperature
—
—
1000 || 1,4
1000 || 1,4
– 0,036
25
—
—
—
—
Ω
|| pF
Ω
|| pF
ppm/K
2
˚C
TC
f
T
0
—
—
dependance of
f
c
:
f
c
(T) =
f
c
(T
0
)(1 +
TC
f
(T –
T
0
)
2
)
3
May 08, 2001
SAW Components
Low Loss Filter for Mobile Communication
Data Sheet
Test matching networks to 50
Ω
(element values depend on pcb layout)
a) Unbalanced - unbalanced matching network
B4874
85,38 MHz
Input: Pin 10
Output: Pin 5
L
s1
= 390 nH
C
p2
= 4,7 pF
C
p3
= 4,7 pF
L
s4
= 390 nH
b) Balanced - balanced matching network
Input: Pins 10 and 9
Output: Pins 5 and 4
C
s1
= 8,2 pF
C
s2
= 8,2 pF
L
p1
= 680 nH
L
p2
= 680 nH
C
s3
= 10 pF
C
s4
= 8,2 pF
Note :
The balanced - balanced network is realized using M/A-COM 1:4 baluns TP-103. The insertion
attenuation of each balun is 0,4 dB at f
N
. The loss of the baluns is not included in the specified
filter insertion attenuation. S-Parameters of the M/A-COM 1:4 baluns TP-103 are available on re-
quest.
The level of ultimate suppression may be limited by electromagnetic feedthrough depending on
the layout of the pcb and the arrangement of the matching components.
The above mentioned characteristics can be realized either in balanced or in unbalanced mode
of operation.
For more details see our application note
PCB Layout for Highly Selective IF Filters.
4
May 08, 2001
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