LRIS64K datasheet(92/100 Pages) STMICROELECTRONICS

92 / 100 page

RF DC and AC parameters

LRIS64K

92/100

Doc ID 15336 Rev 11

RF DC and AC parameters

This section summarizes the operating and measurement conditions, and the DC and AC

characteristics of the device in RF mode. The parameters in the DC and AC Characteristic

tables that follow are derived from tests performed under the Measurement Conditions

summarized in the relevant tables. Designers should check that the operating conditions in

their circuit match the measurement conditions when relying on the quoted parameters.

Table 94.

RF AC characteristics(1) (2)

Symbol

Parameter

Condition

Min

Typ

Max

Unit

fCC

External RF signal frequency

13.553

13.56

13.567

MHz

H_ISO

Operating field according to ISO

TA = 0 °C to 50 °C

150

5000

mA/m

H_Extended

Operating field in extended

temperature range

TA = –40 °C to 85 °C

150

3500

mA/m

MICARRIER

10% carrier modulation index(3) (4)

MI=(A-B)/(A+B)

150 mA/m > H_ISO >

1000 mA/m

H_ISO > 1000 mA/m

tRFR,tRFF

10% rise and fall time

0.5

3.0

µs

tRFSBL

10% minimum pulse width for bit

7.1

9.44

µs

MICARRIER 100% carrier modulation index

MI=(A-B)/(A+B)

100

tRFR,tRFF

100% rise and fall time

0.5

3.5

µs

tRFSBL

100% minimum pulse width for bit

7.1

9.44

µs

tJIT

Bit pulse jitter

-2

µs

tMIN CD

Minimum time from carrier

generation to first data

From H-field min

0.1

fSH

Subcarrier frequency high

fCC/32

423.75

kHz

fSL

Subcarrier frequency low

fCC/28

484.28

kHz

Time for LRIS64K response

4224/fS

318.6

320.9

323.3

µs

Time between commands

4224/fS

309

311.5

314

µs

RF write time (including internal

Verify)

5.75

TA = –40 to 85 °C.

All timing measurements were performed between 0 °C and 50 °C on a reference antenna with the following

characteristics:

External size: 75 mm x 48 mm

Number of turns: 5

Width of conductor: 0.5 mm

Space between 2 conductors: 0.3 mm

Value of the tuning capacitor in SO8: 27.5 pF (LRIS64K)

Value of the coil: 5 µH

Tuning frequency: 13.56 MHz.

Characterized only, not 100% tested

15% (or more) carrier modulation index offers a better signal/noise ratio and therefore a wider operating range with a better

noise immunity

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