T5744-TKS 查看數據表（PDF） - Atmel Corporation

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T5744-TKS

UHF ASK/FSK Receiver

Atmel Corporation 

Figure 10. Enable Timing (1)

Dem_out

ENABLE

DATA

Sleep mode

IS = I Soff

Figure 11. Enable Timing (2)

Start-up mode

IS = I Son

T

Start-up

tee_sig

Receiving mode

IS = I Son

Dem_out

ENABLE

DATA

Sleep mode

IS = I Soff

Start-up mode

IS = I Son

T

Start-up

t

ee_sig

Receiving mode

IS = I Son

Digital Signal

Processing

The data from the ASK demodulator (Dem_out) is digitally processed in different ways

and as a result converted into the output signal DATA. This processing depends on the

selected baudrate range (BR_Range). Figure 12 illustrates how Dem_out is synchro-

nized by the extended basic clock cycle TXClk. Data can change its state only after TXClk

has elapsed. The edge-to-edge time period tee_sig of the DATA signal as a result is

always an integral multiple of TXClk.

The minimum time period between two edges of the data signal is limited to tee_sig ³

TDATA_min. This implies an efficient suppression of spikes at the DATA output. At the

same time it limits the maximum frequency of edges at DATA. This eases the interrupt

handling of a connected microcontroller.

10 T5744

4521B–RKE–01/03

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