EM4095

Copyright

 2002, EM Microelectronic-Marin SA

5

www.emmicroelectronic.com

Timing Characteristics:

Parameters specified below are valid only in case the device is used according to Operating Conditions defined on previous

page.

Parameter

Symbol

Test Conditions

Typ

Max

Units

Set-up time after a sleep period

Tset

25

35

ms

Time from full power to modulation

state

Tmdon

antenna circuit specifications:

Q=15,FRES=125Khz

modulation index: 100%

50

µs

AM demodulation: Delay time from

input to output

Tpd

Modulating signal 2Khz square

wave 10mVpp

40

100

µs

Recovery time of reception after

antenna modulation

Trec

Note 1

400

500

µs

Note 1: RF period is time of one period transmitted on ANT outputs (at 125 kHz 8µs). Trec after antenna modulation

receiver chain is ready to demodulate. The condition is of course that the amplitude on antenna has already reached its

steady state by that time (this depends on Q of antenna). See also Application Notes.

Block Diagram

VDD

SHD

AGND

VSS

to all blocks

LOOP

FILTER

VCO &

SEQUENCER

BIAS &

AGND

SHORT

DETECTION

& READY

BIAS & AGND

to all blocks

ANTENNA

DRIVERS

SYNCHRO

SAMPLER

FILTER

COMPARATOR

to all blocks

to all blocks

CDEC_OUT

CDEC_IN DC2

FCAP

MOD

DMOD_IN

RDY/CLK

DVDD

ANT1

ANT2

DVSS

DMOD_OUT

HOLD

LOCK

Fig. 5