Tag Reader
15
Tag Reader
Typical values reflect average measurements at 6V ≤ V SUP ≤ 16V, V SS = 0V, T J = –40 ° C to + 125 ° C, unless otherwise noted
Table 9. Tag Reader Specifications
Parameter
Symbol
Test Conditions
and Comments
Min
Typ
Max
Unit
Type
Demodulator (pin RD)
2.0
2.2
2.3
Input Voltage Range
Input Modulation Frequency
Demodulator Sensitivity
V INRD
F MOD
V SENSE1
6.5V ≤ V SUP ≤ 16V
3
0.5
4
4
5
5
8
15
V
kHz
mV
Sensitivity is measured in the
following application
conditions: I ANTENNA = 50mA
peak, V RD = 4V peak,
C EXT = 10nF, and square wave
modulation F MOD = F TD1 /32.
See Figure 12
2.31 Demodulator Sensitivity
V SENSE2
6V ≤ V SUP < 6.5V
7
30
mV
The sensitivity is measured in
the following application
conditions:
I ANTENNA = 50mA peak,
V RD = 4V peak, C EXT = 10nF,
and square wave modulation
F MOD = F TD1 /32
See Figure 12
2.4
Demodulation Delay
t Demod
Configuration C
7.5
10
μ s
Not including the delay due to
the slew rate of the K output for
configurations A and B
See figure 12
2.5
2.6
After Write Pulse Settling Time
Recovery Time after wake-up or
t Settling1
t Settling2
Clock stable condition implies
394
646
400
700
μ s
μ s
reset from clock stable to
demodulator valid output
V XTAL1 meets the specification
(see page 15).
Drivers (pins TD1, TD2)
3.5
Output Carrier Frequency to Crystal
Frequency Ratio
R FTD/FXT
AL
64
3.0 Turn on/off Delay
3.1 Driver1/2 Low Side Out. Resistance
3.2 Driver1/2 High Side Out. Resistance
t on/off
R TDL
R TDH
I LOAD = 150mA DC
I LOAD = -150mA DC
2.4
2.1
250
4
4
ns
Ω
Ω
MC33690 Standalone Tag Reader Circuit, Rev. 5
16
Freescale Semiconductor
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