DC and ac parameters SRIX4K
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11 DC and ac parameters
1. All timing measurements were performed on a reference antenna with the following characteristics:
External size: 75 mm x 48 mm
Number of turns: 3
Width of conductor: 1 mm
Space between 2 conductors: 0.4 mm
Value of the coil: 1.4 µH
Tuning Frequency: 14.4 MHz.
Table 6. Operating conditions
Symbol Parameter Min. Max. Unit
T
A
Ambient operating temperature –20 85 °C
Table 7. DC characteristics
Symbol Parameter Condition Min Typ Max Unit
V
CC
Regulated voltage 2.5 3.5 V
I
CC
Supply current (active in read) V
CC
= 3.0 V 100 µA
I
CC
Supply current (active in write) V
CC
= 3.0 V 250 µA
V
RET
Retromodulation induced voltage ISO 10373-6 20 mV
C
TUN
Internal tuning capacitor 13.56 MHz 64 pF
Table 8. AC characteristics
Symbol Parameter Condition Min Max Unit
f
CC
External RF signal frequency 13.553 13.567 MHz
MI
CARRIER
Carrier modulation index MI=(A-B)/(A+B) 8 14 %
t
RFR
,t
RFF
10% rise and fall times 0.8 2.5 µs
t
RFSBL
Minimum pulse width for start bit ETU = 128/f
CC
9.44 µs
t
JIT
ASK modulation data jitter Coupler to SRIX4K –2 +2 µs
t
MIN CD
Minimum time from carrier
generation to first data
5ms
f
S
Subcarrier frequency f
CC
/16 847.5 kHz
t
0
Antenna reversal delay 128/f
S
151 µs
t
1
Synchronization delay 128/f
S
151 µs
t
2
Answer to new request delay 14 ETU 132 µs
t
DR
Time between request characters Coupler to SRIX4K 0 57 µs
t
DA
Time between answer characters SRIX4K to coupler 0 µs
t
W
Programming time for write
With no auto-erase cycle
(OTP)
3ms
With auto-erase cycle
(EEPROM)
5ms
Binary counter
decrement
7ms
