ATR0601 Datasheet, PDF (9/17 Pages) ATMEL Corporation – GPS FRONT-END IC

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)
100nF
100nF
100nF
5pF
5pF
PU XTO
PU RF
17 PUxto
18 PUrf
10nF
47pF _4.7nH
1.5pF
ATR0610
LNA section (opt.)
1.3pF
11 RF
5.6nH
SAW
B4060
1.3pF
10 NRF
6 XTO
3 NXTO
27
X1
47pF
82pF
47pF
5X
4 NX
Reference frequency: Application #1
PMSS
Logic
VCO
PLL
XTO
1
A
D
A
D
SDI 21
SL 22
Data out "low"
SH 23
Data out "high"
SC 24
Sample clock
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)
R1
X1
47pF
82pF
47pF
6
XTO
3
NXTO
5
X
4
NX
Reference frequency: Application #2
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”.
9
4866A–GPS–08/05