Rainbow-electronics ATR0601 Manual do Utilizador descarregar pdf (Página 9)

4866A–GPS–08/05

ATR0601 [Preliminary]

9. Application Circuit

Figure 9-1. Application Example Using a GPS Crystal with ESR

typ

= 12Ω (Please see Table 9-1 on page 11)

Note: Please consider the recommended IF-filter layout, shown in Figure 9-5 on page 11.

Figure 9-2. Application Example Using a GPS Crystal with ESR

typ

≠ 12Ω

(Please see Table 9-2 on page 11)

Note: The external series resistor R1 has to be selected depending on the typical value of the crystal

ESR. Please refer to Application Note “ATR0601: Crystal and TXCO selection”.

NBPI

XTO

PMSS

Logic

PUrf

PUxto

NRF

XTO

NXTO

EGC

AGCO

NBP

BPI

VCO

PLL

SDI

5.6nH

1.3pF

SAW

5pF

VCC

220nH

B4060

ATR0610

PU XTO

PU RF

Data out "high"

Data out "low"

Sample clock

TEST

MO8

NC12

4.7nH

1.5pF

47pF

VCC

10nF

PU RF

GND

VCC

VDIG

VCC

VDIG

VCC

100nF

100pF

47pF

82pF

Reference frequency: Application #1

LNA section (opt.)

47pF

82pF

XTO

NXTO

Reference fre

uenc

: A

lication #2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

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