GC5018_06 Datasheet, PDF (103/134 Pages) Texas Instruments – 8-CHANNEL WIDEBAND RECEIVER

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4.4.5.5 CIC_MODE1 Register
GC5018
8-CHANNEL WIDEBAND RECEIVER
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Register name: CIC_MODE1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x04
BIT 15
BIT 8
cic_scale_a(4:0)
cic_scale_b(4:2)
0
0
0
0
0
0
0
0
BIT 7
cic_scale_b(1:0)
cic_gain_ ddc
0
0
0
0
cic_decim(4:0)
0
0
0
BIT 0
0
cic_scale_a(4:0) : This sets the gain shift at the output of the A channel CIC. 0x00 is no shift, each
increment by 1 increases the signal amplitude by 2X.
cic_scale_b(4:0) : This sets the gain shift at the output of the B channel CIC. 0x00 is no shift, each
increment by 1 increases the signal amplitude by 2X.
cic_gain_ddc : Adds a fixed gain of 12dB at the CIC output when asserted.
cic_decim(4:0) : Sets the CIC decimation rate, where decimation is cic_decim + 1.
4.4.5.6 CIC_MODE2 Register
Register name: CIC_MODE2
BIT 15
0
BIT 7
0
cic_m2_ena_a(5:0)
0
0
0
cic_m2_ena_b(3:0)
0
0
0
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
0
unused
0
0
unused
0
Address: 0x05
BIT 8
cic_m2_ena_b(5:4)
0
0
unused
0
BIT 0
unused
0
cic_m2_ena_a(5:0) : Programs the A channel CIC fir sections M value to 2 when set, 1 when cleared.
cic_m2_ena_a(0) controls the M value for the first comb section and cic_m2_ena_a(5)
controls the M value for the last comb section.
cic_m2_ena_b(5:0) : Programs the B channel CIC fir sections M value to 2 when set, 1 when cleared.
cic_m2_ena_b(0) controls the M value for the first comb section and cic_m2_ena_b(5)
controls the M value for the last comb section.
GC5018 GENERAL CONTROL 103