Software Control
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●
Gain Select:
Selects whether each bit in the fast-gain control is either 1 dB or 2 dB.
●
3 dB Attn:
Engages the 3-dB attenuator at the baseband output.
●
Det Filter
Selects the internal detector filter used in dc offset calibration.
●
RF Pwd
Enables SW-controlled power down of RF stages inside device.
●
BUF Pwd
Enables power down on test buffer for mixer output; default is powered
down.
●
Osc_Test
Enables dc offset oscillator to the READBACK pin on the TRF3711.
●
DC_OFF_DIG Pwd
Enables SW-controlled power down of dc offset-correction circuitry.
2.2.2
Register 2
●
Auto Cal
Manual mode allows the dc offset DACs to be user-configurable; Auto mode uses
the internally stored values.
●
En Auto Cal:
When toggled, an Auto Cal is initiated. Note, Auto Cal must be in Auto mode.
●
IQ DAC:
Shows the setting of the dc offset I and Q DAC when in manual mode; range is 0
to 255.
●
Cal Clk Sel:
Toggle between using an externally supplied SPI clock or internal oscillator clock.
●
Osc. Freq.
Selects the oscillator frequency for the internal clock.
●
Clk Div
Sets the clock divider if the control clocks must be slowed down. Value chosen in
conjunction with Det Filter setting for optimal averaging.
●
IDet:
Selects the resolution of the I and Q DAC.
2.2.3
Register 3
●
I/QLoadA/B:
Selects the mixer gain for the differential BB paths. Typically, modification of these
registers is not required, but they can be tweaked for minor I/Q amplitude
adjustment.
●
Filter Ctrl:
Trims the peaking response of the BB LPF response.
●
Bypass
Engages the bypass feature of the BB LPF.
2.2.4
Register 5
●
Mix GM Trim
No adjustment of this register required.
●
Mix LO Trim
No adjustment of this register required.
●
LO Trim
No adjustment of this register required.
●
Mix Buff Trim
No adjustment of this register required.
●
Filter Trim
No adjustment of this register required.
●
Out Buff Trim
No adjustment of this register required.
2.2.5
Misc Settings
●
Reset USB:
Toggle this button if the USB port is not responding. This generates a new USB
handle address.
●
Show Bytes:
Shows the 32-bit word that is sent for each register.
●
Stop
Stops the program.
4
TRF3711xxEVM
SLWU069B – February 2010 – Revised November 2010
Copyright © 2010, Texas Instruments Incorporated
