Connectors And Test Points; Test Points (Tp) - Texas Instruments TRF4900 User Manual

Connectors and Test Points

2.7 Connectors and Test Points
The following information describes the TRF4900 EVM connectors and test
points.
2.7.1 Connectors
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2.7.2

Test Points (TP)

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2-14
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
TRF4900 software is running.
J1
TX_OUT is an SMA female connector which is connected to the
transmitter output of the TRF4900.
J2 VCO_TANK
VCO_TANK is an SMA female connector used with resistors R8, R9, R10,
R11, and capacitor C6 to directly feed in an external VCO signal. Resistors
R8, R9, R10, and R11 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.
LDET TP
The LDET test point is used to monitor the lock detect line of the TRF4900.
MODE TP
The MODE test point is used to monitor the MODE line.
STDBY TP
The STDBY test point is used to monitor the STDBY line.
CLOCK TP
The CLOCK test point is used to monitor the CLOCK signal from the PC.
DATA TP
The DATA test point is used to monitor the DATA signal from the PC.
STROBE TP
The STROBE test point is used to monitor the STROBE signal from
the PC.
TXDATA TP
The TXDATA test point is used to monitor the transmitted data. Transmit
data from an external source can also be applied at this point.