Connectors; Test Points (Tp) - Texas Instruments TRF6900 User Manual

2.7 Connectors and Test Points
The following are descriptions of the TRF6900 EVM connectors and test
points.
2.7.1

Connectors

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2.7.2

Test Points (TP)

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P1
P1 is the PC parallel port interface and is a male DB25 connector. P1 is
connected to the LPT1 or LPT2 port of the computer on which the
TRF6900 software is running.
J1 MIX_OUT
MIX_OUT is an SMA female connector used with jumpers JP1 and JP2
to test the mixer circuit of the TRF6900.
J2 LNA_OUT/MIX IN
LNA_OUT/MIX_IN is an SMA female connector used with jumpers JP1
and JP2 to test the mixer and LNA circuits of the TRF6900.
J3 IF_OUT
IF_OUT is an SMA female connector used with jumper JP3 to monitor the
IF output circuit of the TRF6900.
J4 RX_IN
RX_IN is an SMA female connector which is connected to the input of the
LNA. The LNA is the input to the receiver section of the TRF6900.
J5 TX_OUT
TX_OUT is an SMA female connector which is connected to the transmit-
ter output of the TRF6900.
J6 RSSI/RXDATA_OUT
This is a SMA female connector used with jumper JP4 to monitor the
RXDATA output or RSSI output of the TRF6900.
J7 VCO_TANK
VCO_TANK is an SMA female connector used with resistors R22, R24,
R25, R26, and capacitor C31 to directly feed in an external VCO signal.
Resistors R22, R24, R25, and R26 are used to form a T attenuator. The
components for this option are not installed on the EVM.
TP1
Test point TP1 is used to monitor the tuning voltage applied to the VCO
circuit by the PLL circuit.
AMP_OUT TP
The AMP_OUT test point is used to monitor the output of the LPF
amplifier/post-detection amplifier.
LDET TP
The LDET test point is used to monitor the lock detect line of the TRF6900.
Connectors and Test Points
Evaluation Board