Mode Options; Output Parameters; Pll And Mm Options; Lpt Port - Texas Instruments TRF6900 User Manual

Main Program Screen
3.2.2

Mode Options

This section allows the user to control various features of the TRF6900. The
following is a brief summary of the 12 controls.
1) PLL:
2) VCO:
3) Pwr Amp:
4) Slicer:
5) SLCTL:
6) LPF:
7) DSW:
8) RSSI:
9) LIM:
10) IF:
11) MIX:
12) LNA:
3.2.3

Output Parameters

This section allows the user to turn the TRF6900 Enable, TXData, and Mode
control lines on and off. When the mode control line is off, Mode 0 is defaulted.
When the mode control line is on, Mode 1 is defaulted. Mode 0 initializes using
Words A and D, Mode 1 initializes using Words B and C.
Clock Width and Strobe Width allow the clock and strobe pulse widths to be
increased or decreased.
3.2.4

PLL and MM Options

Allows the change of the APLL value (0, 20, 40...140), the NPLL value (256,
512), and the modulation mode (FSK).
3.2.5

LPT Port

Allows the user to change between the LPT1 and LPT2 ports of the controlling
computer.
Turns the phase-locked loop on or off.
Turns the voltage controlled oscillator on or off.
Allows the power amp to be set to off, 20-dB attenuation,
10-dB attenuation, or 0-dB attenuation states.
Turns the data slicer on or off.
If the data slicer is on, this selects either the Learn or
Hold mode for the data slicer.
Turns the low pass filter (LPF) on or off.
Data switch. Selecting LIM sets LPF input to the
demodulator. Selecting RSSI sets the LPF input to the RSSI.
Turns the radio strength signal indicator (RSSI) on or off.
Turns the limiter (LIM) on or off.
Turns the intermediate frequency (IF) amplifier on or off.
Turns the mixer on or off.
Allows the low-noise amplifier (LNA) to be set to off, low
gain, or high gain modes.