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APPLICATION INFORMATION

CRYSTAL OSCILLATOR LEVEL CONVERSION

XIN

OG[1:0]

OG[1:0]

OP[2:0]

EN

FOUT

XOUT

VSS

OscillatorCaseWith4Pins

CXOUT

C

BASE

CXOUT

C

BASE

Var

C

BASE

Var

C

BASE

C

L

C

L

CXO[7:0]

Read-Back

Mode

CXI[7:0]

Oscillator

Gain

Stage

EEPROM

and

Control

Logic

SDATA

ENand

SDATA

2MW

VDD

Divider

P

Bias

+

–

M

U

X

2MW

B0027-04

C

=

15pF

LOAD

C

=100nF

Filter

VSUPPLY

2.25V – 3.3V

CDCE401

SCAS820 – JUNE 2006

Figure 7. Crystal Oscillator Application at 40 MHz in a 4-Pin Oscillator Case

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Phase noise specifications under following assumptions:

Phase noise at 10 Hz

VDD = 2.5 V

–70

dBc/Hz

Phase noise at 100 Hz

VDD = 2.5 V

–100

dBc/Hz

Phase noise at 1 kHz

VDD = 2.5 V

–130

dBc/Hz

Phase noise at 10 kHz

VDD = 2.5 V

–145

dBc/Hz

Phase noise at 100 kHz

VDD = 2.5 V

–150

dBc/Hz

Phase noise at 1 MHz

VDD = 2.5 V

–150

dBc/Hz

15

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