Texas Instruments 2000 series, Reference Manual

Page: 16 / 52

High Performance RA-RFM RI-RFM-008B February 2002
16
Table 3 lists the pin functions for the J4 pulse width adjustment connector. The
connector type is 4 pin, 2 row with 2.54 mm pin spacing.
Table 3: J4 Pin Functions
Pin# Signal Description
1 RX Analog transponder signal
2 GNDA Ground antenna circuit
3 Pulse width adjusting resistor connecting pin
4 GND Logic ground
Table 4 lists the functions for the antenna connector used to connect the RA-RFM
to the Antenna Tuning Board.
Table 4: Connector ANT1
Pin# Signal Direction Description
1 GNDA OUT Ground for cable shield
2 ANT_2 IN/OUT Symmetrical antenna input/output 2
3 ANT_1 IN/OUT Symmetrical antenna input/output 1
Jumper JP4 allows enabling and disabling of common noise filtering for EMI
purposes. The default setting, with common noise filtering active, jumpers pins 2
and 3. A jumper between pins 1 and 2 bypasses common noise filtering.