atr0630 ATMEL Corporation, atr0630 Datasheet - Page 25

• Manufacturer Part Number: atr0630
• Description: Antaris4 Single-chip Gps Receiver - Atmel Corporation
• Manufacturer: ATMEL Corporation

5. Crystals
5.1
4920B–GPS–06/06
GPS XTAL
The ATR0630 only needs a GPS crystal (XTAL), but supports also TCXOs. The reference fre-
quency is 23.104 MHz. By connecting an optional RTC crystal, different power modes are
available. The reference frequency is 32.768 kHz.
Figure 5-1.
Figure 5-2.
Note:
The external series resistor R1 has to be selected depending on the typical value of the crystal
ESR. Refer to the application note “ATR0601: Crystal and TXCO Selection”.
Application Example Using a GPS Crystal with ESR Typically = 12Ω
(See
Application Example Using a GPS Crystal With ESR Typically
(See
Table 5-1 on page
Table 5-2 on page
27
R1
X1
X1
27)
27)
47 pF
68 pF
47 pF
47 pF
68 pF
47 pF
ATR0630 [Preliminary]
B3
A2
B2
B3
A2
B2
A1
A1
NXTO
NX
NXTO
NX
XTO
X
XTO
X
≠
12Ω
25