Rainbow-electronics ATR0601 Bedienungsanleitung PDF herunterladen (Seite 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 Figure 9-5 on page 11 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.

Table 9-1. Specification of GPS Crystals Appropriate for the Application Example Shown in

Figure 9-1 on page 9

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

Figure 9-2 on page 9

Parameter Comment Min. Typ. Max. Units

Equivalent Series Resistance (ESR)

Fundamental Specification 7 40 Ω

Le Lf

13 14 15 16

NBPI

NBP

BPI

VCC

Lc Ld Le

13 14 15

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17

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