Atr0601 [preliminary – Rainbow Electronics ATR0601 User Manual
Page 11
11
4866A–GPS–08/05
ATR0601 [Preliminary]
Figure 9-5.
Recommended IF-filter: Layout versus Schematic
Note:
Mutual inductance between the four inductors Lc - Lf plays an important role in the IF-filter charac-
teristics. In any design, the layout arrangement shown in
should be
resembled as close as possible. Measures: A = 2.8 mm; B = 1.4 mm; Lc - Lf: Wirewound SMD
inductors, 0603 size. (Please see Table 10-1).
Note:
All other parameters as specified in
.
Table 9-1.
Specification of GPS Crystals Appropriate for the Application Example Shown in
Parameter
Comment
Min.
Typ.
Max. Units
Frequency Characteristics
Fundamental Frequency
Nominal frequency referenced to
25°C
23.104
MHz
Calibration tolerance
Frequency at 23°C ±2°C
7.0
±ppm
Frequency deviation
Over operating temperature range
15.0
±ppm
Temperature range
Operating temperature range
–40.0
+85.0
°C
Electrical
Load capacitance (CL)
18.5
19.5
pF
Equivalent Series Resistance (ESR)
Fundamental
Specification
7
12
23
Ω
Table 9-2.
Specification of GPS Crystals Appropriate for the Application Example Shown in
Parameter
Comment
Min.
Typ.
Max. Units
Equivalent Series Resistance (ESR)
Fundamental
Specification
7
40
Ω
Ca
Cb
Ld
Le
Lf
Lc
A
B
13
14
15
16
N
BPI
BP
NB
P
BPI
Ca
Cb
VCC
Lc
Ld
Le
Lf
13
14
15
16