Lime Microsystems LMS7002MR3 - TRF(1, 2) Configuration Memory

35
2.10 TRF(1, 2) Configuration Memory
The block diagrams of TRF1 and TRF2 modules are shown in Figure 9 and Figure 10
respectively. The tables in this chapter describe control registers of TRF1 and TRF2 modules.
Table 11: TRF(1, 2) configuration memory
Address (15 bits)
Bits
Description
0x0100
15
14
13 – 12
11 – 10
9 – 4
3
2
1
0
EN_LOWBWLOMX_TMX_TRF_(1, 2): Controls the high pass pole frequency of the
RC biasing the gate of the mixer switches.
0 – High band – bias resistor 3K (default)
1 – Low band – bias resistor 30K
EN_NEXTTX_TRF_(1, 2): Enables the daisy change LO buffer going from TRF_1 to
TRF2
0 – Buffer disabled (SISO) (default)
1 – Buffer enabled (MIMO)
EN_AMPHF_PDET_TRF_(1, 2)[1:0]: Enables the TXPAD power detector
preamplifier
3 – Preamp gain 25dB (default)
2 – Do not use
1 – Preamp gain 7dB
0 – Preamp gain -10dB
LOADR_PDET_TRF_(1, 2) [1:0]: Controls the resistive load of the Power detector
0 – R_DIFF 5K||2.5K||1.25K
1 – R_DIFF 5K||1.25K (default)
2 – R_DIFF 5K||2.5K
3 – R_DIGG 5K
Reserved
PD_PDET_TRF_(1, 2): Power down signal for Power Detector
0 – Enabled
1 – Powered down (default)
PD_TLOBUF_TRF_(1, 2): Power down signal for TX LO buffer
0 – Enabled (default)
1 – Powered down
PD_TXPAD_TRF_(1, 2): Power down signal for TXPAD
0 – Enabled (default)
1 – Powered down
EN_G_TRF_(1, 2): Enable control for all the TRF_1 power downs
0 – All TRF_1 modules powered down
1 – All TRF_1 modules controlled by individual power down registers
(default)
Default: 00110100 00001001
0x0101
15 – 13
12 – 11
10 – 6
5 – 1
0
F_TXPAD_TRF_(1, 2)[2:0]: controls the switched capacitor at the TXPAD output. Is
used for fine tuning of the TXPAD output. Default: 3
L_LOOPB_TXPAD_TRF_(1, 2)[1:0]: Controls the loss of the of the loopback path at
the TX side
0 – Loss=0dB
1 – Loss=20*log10(5)
2 – Loss=20*log10(11)
3 – Loss=20*log10(16) (default)
LOSS_LIN_TXPAD_TRF_(1, 2)[4:0]: Controls the gain of the linearizing part of the
TXPAD Default: 0
0<=Loss<=10 – Pout=Pout_max-Loss
11<=Loss<31 – Pout=Pout_max-10-2*(Loss-10)
Ideally LOSS_LIN = LOSS_MAIN
LOSS_MAIN_TXPAD_TRF_(1, 2)[4:0]: Controls the gain & output power of the
TXPAD. Default: 0
0<=Loss<=10 – Pout=Pout_max-Loss
11<=Loss<31 – Pout=Pout_max-10-2*(Loss-10)
EN_LOOPB_TXPAD_TRF_(1, 2): Enables the TXPAD loopback path
0 – Loopback disabled (default)
1 – Loopback enabled
Default: 01111000 00000000