PEF24902 datasheet(25/52 Pages) INFINEON

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PEB 24902

PEF 24902

Functional Description

Data Sheet

Rev. 1, 2004-05-28

Note that the load capacitors are integrated in the IEC-4-AFE-X Version 3.2. No

additional capacitance has to be connected neither to XIN nor to XOUT. The crystal

specifications shall meet the requirements given in Table 6.

A suitable type of crystal would be:

Vibrator:

Mode of vibration

fundamental

Crystal cut

ATI

Application hint: Parasitic capacitances at XIN and XOUT pin, e.g. due to board

capacitances should be below 3 pF.

3.3

Analog Line Port

The IEC-4-AFE-X Version 3.2 chip gives access to four line ports. The signal to be

transmitted is issued differentially at pins AOUT0..3 and BOUT0..3. The input is

differentially sampled at AIN0..3 and BIN0..3. Each line port consists of three main

function blocks (see Figure 4):

•

The analog-to-digital converter in the receive path

•

The digital-to-analog converter in the transmit path

•

The output filter in the transmit path

Furthermore a line port contains some special functions. These are:

•

Analog test loop-back

•

Level detect function

Operating frequency

CLoad = 15 pF

CLoad = 7 pF

15.35770

15.36230

MHz

Current

Load capacitance

9.8

10.2

Overall tolerance

∆f/f

ppm

Resonance resistance Rr

Ω

Shunt capacitance C0

7pF

Motional capacitance C1

Overall pullability

± 210

ppm

Table 6

Specification of the Crystal (cont’d)

Parameter

Limit Values

Unit

Min.

Typ.

Max.

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