TR371125 Register Definitions
13
SLWU070D – February 2010 – Revised August 2016
Copyright © 2010–2016, Texas Instruments Incorporated
TSW6011EVM
5
TR371125 Register Definitions
5.1
Register 1
●
BB Gain:
The PGA (Programmable Gain Amplifier) setting; range is 0 to 24.
●
LPFAdj:
Sets the bandwidth of the BB filters. Setting 0 is maximum bandwidth
(~29.6 MHz); setting 254 is minimum
(~ 1.27 MHz). See the
(
) for comprehensive curves.
●
EN_FastGain:
Enables the fast gain option to adjust PGA gain with external bits.
●
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.
●
DC_Off_DIG
Pwd:
Enables SW controlled power down of dc offset correction circuitry.
5.2
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.
●
I/Q 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 need to be slowed down. Value chosen
in conjunction with Det Filter setting for optimal averaging.
●
I Det:
Selects the resolution of the I and Q DAC.
5.3
Register 3
●
I/QLoadA/B:
Selects the mixer gain for the differential BB paths. Typically, these registers do
not need to be modified, but minor I/Q amplitude adjustments are allowed.
●
Filter Ctrl:
Trims the peaking response of the BB LPF response.
●
Filter Bypass
Engages the bypass feature of the BB LPF.
5.4
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
The hex values in the Register # boxes are the actual values loaded into the TRF371125.
