ATR0635_08 Datasheet, PDF (25/35 Pages) ATMEL Corporation – ANTARIS4 Single-chip GPS Receiver SuperSense

5. Crystals
5.1 GPS
ATR0635
The ATR0635 requires a GPS TCXO. The reference frequency 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. Equivalent Application Examples Using a GPS TCXO (See Table 5-1 on page 26)
TCXO
12 pF
22 pF
4.7 pF
Do not
connect
A1
XTO
B3
NXTO
A2
X
B2
NX
TCXO
12 pF
22 pF
4.7 pF
Do not
connect
A1
XTO
B3
NXTO
A2
X
B2
NX
Figure 5-2. Application Example Using an External Reference Frequency and Balanced
Inputs (See Table 5-2 on page 26)
1:1
V_in
Do not
connect
A1 _XTO
B3 _NXTO
A2
X
B2 _NX
25
4928H–GPS–06/08