Rainbow-electronics ATR0630 Manual do Utilizador descarregar pdf (Página 25)

25

4920A–GPS–01/06

ATR0630 [Preliminary]

5. Crystals

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.

5.1 GPS XTAL

Figure 5-1. Application Example Using a GPS Crystal with ESR Typically = 12Ω

(See Table 5-1 on page 27)

Figure 5-2. Application Example Using a GPS Crystal With ESR Typically

≠

12Ω

(See Table 5-2 on page 27)

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”.

X1

27

47 pF

47 pF

82 pF

B2

A2

B3

A1

X

NX

XTO

NXTO

X1

R1

47 pF

47 pF

82 pF

B2

A2

B3

A1

X

NX

XTO

NXTO

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