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February 2002
Specifications
23
Table 11: Timing Characteristics
Symbol
Parameter
min.
typ.
max Unit
t_TX
Transmit burst length for correct operation
(see note below)
15 50 100 ms
t_dtck
Delay time from beginning of data bit at RXDT being valid to positive
slope of RXCK signal
20
µ
s
t_dtvd
Time for data bit of RXDT signal being valid after positive slope of
RXCK
90
µ
s
t_ckhi
Time for clock signal RXCK being high
55
µ
s
t_ri
t_fi
Necessary rise and fall times for input signal TXCT- and TXCT-R
1
1
µ
s
µ
s
t_ro
t_fo
Rise and fall time of output signals RXDT and RXCK
1
1
µ
s
µ
s
t_ro_R
Rise time of output signal RXSS-
(no external connection)
1
µ
s
t_fo
Fall time of output signal RXSS-
1
µ
s
tss_01Tl
Propagation delay time from positive slope of TXCT- to positive slope
of RXSS- signal (maximum sensitivity)
500 1000 1500
µ
s
tss_10Tr Propagation delay time from negative slope of TXCT- to negative
slope of RXSS- signal (minimum sensitivity)
50 100 200
µ
s
Note:
Due to transponder parameters a minimum charge-up time of 15 ms
is necessary. Decreasing charge-up time decreases read range by
sending less energy to the transponder.
Table 12: Mechanical Parameters
Parameter
typical
Unit
Height of complete RA-RFM including mounting bolts 44.0 +/- 1.5 mm
Height of Antenna Tuning Board
27.0 +/- 3.0 mm
Weight of RA-RFM
160
g
Weight of Antenna Tuning Board
162
g
Summary of Contents for 2000 series
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