Texas Instruments TRIS TMS37122 - Recommended System Operating Conditions

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Analog Front End IC TMS37122 - Reference Guide August ’01
4.2 Recommended System Operating Conditions
4.2.1 Base Station - Test Station Conditions
4.2.2 Identification Device Conditions
Parameter Sign Note Min Nom Max Unit
Transmitter frequency fTX 120 134.2 140 kHz
Wake-up Time tWAKE 5 10 ms
Wake-up Time tWAKE Backup Mode 10 50 ms
Data Rate fRX 100% AM, PPM 500 2000 4000 bits/s
Wake Data Rate fWAKE
Pulse Position
Modulation,
16 low bits
1000 2500 4000 bits/s
Transmitter Operating
Quality Factor
QopTX 30 33
Note:
The following parameters have to be established in the application.
Parameter Sign Note Min Nom Max Unit
Resonance Frequency fRES
ANT1, ANT2, ANT3
VCL = 5 V
120 134.2 140 kHz
Identification Device Quality
Factor
QopTRP
ANT 1 used for backup
function
Notes 1 & 2
10 30
Identification Device Quality
Factor
QopTRP
ANT 1, 2, 3,
no backup function
Notes 1 & 2
20
Low Bit Transmit Frequency fL
ANT1, -40...85 ºC
Qop=10…30
Notes 1 & 2
130.2 134.7 139.5 kHz
Low Bit Transmit Frequency fL
ANT1, 25 ºC
Qop=10…30
Notes 1 & 2
132.0 134.7 136.5 kHz
High Bit Transmit Frequency fH
ANT1, -40...85 ºC
Qop=10…30
Notes 1 & 2
118.0 123.7 128.0 kHz
High Bit Transmit Frequency fH
ANT1, 25 ºC
Qop=10…30
Notes 1 & 2
120.0 123.7 126.5 kHz
Notes:
1. Fres = 134.2 kHz.
2. Min/Max parameters depend on LR + CR temperature coefficient.