IF Filters for CDMA Cellular Phones
The following products presented in this data sheet are being withdrawn.
Ordering Code
B39131B4957H710
Substitute Product
Date of
Withdrawal
2006-12-01
Deadline Last
Orders
2007-02-28
Last Shipments
2007-05-31
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 B4957
SAW Components
Low-Loss Filter for Mobile Communication
Data Sheet
Features
s
s
s
s
s
s
B4957
128,1 MHz
SMD package
QCC10E
1,0 2,54
3
2
1
Terminals
s
Gold plated
1,5
side view
8,7
4,6
1,5
top view
IF filter for mobile telephone
Channel selection in CDMA systems
High rejection, small size
Low insertion attenuation, low amplitude ripple
Filter surface passivated
Package for
Surface Mounted Technology
(SMT)
1,0
6
5
7
2,54
8
0,75
1,2
bottom view
9
4
Dimensions in mm, approx. weight 0,23 g
Pin configuration
9, 10
4
5
2, 7
1, 3, 6, 8
Balanced Output
Input or Input Ground
Input
Ground
Case ground
Type
B4957
Ordering code
B39131-B4957-H710
Marking and Package
according to
C61157-A7-A127
Packing
according to
F61074-V8192-Z000
Electrostatic Sensitive Device
(ESD)
Maximum ratings
Operable temperature range
Storage temperature range
DC voltage
Source power
T
T
stg
V
DC
P
s
– 40/+ 85
– 40/+ 85
5
10
˚C
˚C
V
dBm
2
Mar 02, 2004
10
SAW Components
Low-Loss Filter for Mobile Communication
Data Sheet
Operating temperature range:
Terminating source impedance:
Terminating load impedance:
B4957
128,1 MHz
T
= -30˚C ... +85 ˚C
Z
S
= 1370
Ω
|| 170 nH
Z
L
= 760
Ω
|| 119 nH
min.
typ.
128,1
9,2
max.
—
10,5
MHz
dB
Nominal frequency
Minimum insertion attenuation
(including loss in matching network without loss in balun)
f
N
α
min
—
—
Amplitude ripple
f
N
– 0,3 MHz
∆α
...
f
N
+ 0,3
MHz
—
0,6
1,0
dB
Phase linearity
(rms deviation)
f
N
– 0,615MHz ...
f
N
+ 0,615 MHz
Relative attenuation
(relative to
α
min
)
f
N
±
0,615MHz
10,0
MHz
f
N
– 5,0 MHz
f
N
– 2,05 MHz
f
N
– 1,7 MHz
f
N
– 1,25 MHz
f
N
– 0,9 MHz
f
N
+ 0,9 MHz
f
N
+ 1,25 MHz
f
N
+ 1,7 MHz
f
N
+ 2,05 MHz
f
N
+ 0,9 MHz
f
N
+ 5,0 MHz
...
...
α
rel
—
1,6
3,0
˚
—
MHz
MHz
45
1)
37
37
37
37
37
37
37
37
37
37
45
2)
60
48
4,0
48
39
49
44
52
43
40
53
44
54
40
48
75
50
4,5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
f
N
– 5,0
f
N
– 0,9
...
...
f
N
+ 5,0 MHz
f
N
+ 70,0 MHz
173,715 MHz
208,715 MHz
172,485 MHz ...
207,485 MHz ...
1) exception: 122,1 MHz +/- 200 kHz
2) exception: 135,2 MHz +/- 300 kHz
3
Mar 02, 2004
SAW Components
Low-Loss Filter for Mobile Communication
Data Sheet
Transfer function:
passband, single ended (pin 5) - balanced (pins 9,10)
B4957
128,1 MHz
4
Mar 02, 2004
Microchip MCU
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