AT86RF211DAI-R datasheet(18/48 Pages) ATMEL

18 / 48 page

AT86RF211

1942C–WIRE–06/02

To operate this way, the user must make sure that the "0" and "1" level at the output of

the discriminator are "on both sides" of the comparison level in order for the decision to

be made properly.

Figure 22. How toSet Up theDataSlicing Parameters

To set the discriminator and the Data Slicer accordingly:

–

It is possible to measure the output DC level of the discriminator DISCOUT

(thanks to the A/D embedded converter)

–

DTR[1:0] make it possible to shift (up or down) the DC level at the output of

the discriminator :

- DTR[1] = 1: +180 mV + 77x (V

CC -2.4V)

- DTR[0] = 1: -180 mV - 77x (V

CC -2.4V)

–

DTR[5:2] make it possible to tune the comparison threshold around V

CC/2.

16 levels are possible, with a LSB = 15 mV per Volt of supply voltage. V

CC/2

corresponds to DTR[5:2] = 0111, and the RESET value is 1000.

These procedures can be made automatically by software. Please refer to the applica-

tion note.

DISCOUT:

demodulated

data

Not OK

Comparator threshold

Time

AT86RF211DAI-R 数据表(PDF) 18 Page - ATMEL Corporation