Texas Instruments CC1020, Manual

Page: 78 / 95

CC1020
SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015 www.ti.com
Table 5-49. GAIN_COMP Register (1Fh)
DEFAULT
REGISTER NAME ACTIVE DESCRIPTION
VALUE
GAIN_COMP[7:0] GAIN_COMP[7:0] 0 — Signed compensation value for mixer I/Q gain error. Used for image
rejection calibration.
–128: approx. –1.16 dB adjustment between I and Q gain
–1: approx. –0.004 dB adjustment between I and Q gain
0: approx. +0.004 dB adjustment between I and Q gain
127: approx. +1.16 dB adjustment between I and Q gain
Table 5-50. POWERDOWN Register (20h)
DEFAULT
REGISTER NAME ACTIVE DESCRIPTION
VALUE
POWERDOWN[7] PA_PD 0 H Sets PA in power down when PD_MODE[1:0]=2
POWERDOWN[6] VCO_PD 0 H Sets VCO in power down when PD_MODE[1:0]=2
POWERDOWN[5] BUFF_PD 0 H Sets VCO divider, LO buffers and prescaler in power-down when
PD_MODE[1:0]=2
POWERDOWN[4] CHP_PD 0 H Sets charge pump in power down when PD_MODE[1:0]=2
POWERDOWN[3] LNAMIX_PD 0 H Sets LNA/mixer in power down when PD_MODE[1:0]=2
POWERDOWN[2] VGA_PD 0 H Sets VGA in power down when PD_MODE[1:0]=2
POWERDOWN[1] FILTER_PD 0 H Sets image filter in power down when PD_MODE[1:0]=2
POWERDOWN[0] ADC_PD 0 H Sets ADC in power down when PD_MODE[1:0]=2
Table 5-51. TEST1 Register (21h, for Test Only)
DEFAULT
REGISTER NAME ACTIVE DESCRIPTION
VALUE
TEST1[7:4] CAL_DAC_OPEN[3:0] 4 — Calibration DAC override value, active when BREAK_LOOP=1
TEST1[3:0] CHP_CO[3:0] 13 — Charge pump current override value
Table 5-52. TEST2 Register (22h, for Test Only)
DEFAULT
REGISTER NAME ACTIVE DESCRIPTION
VALUE
TEST2[7] BREAK_LOOP 0 H 0: PLL loop closed
1: PLL loop open
TEST2[6] CHP_OVERRIDE 0 H 0: use calibrated value
1: use CHP_CO[3:0] value
TEST2[5] VCO_OVERRIDE 0 H 0: use calibrated value
1: use VCO_AO[4:0] value
TEST2[4:0] VCO_AO[4:0] 16 — VCO_ARRAY override value
Table 5-53. TEST3 Register (23h, for Test Only)
DEFAULT
REGISTER NAME ACTIVE DESCRIPTION
VALUE
TEST3[7] VCO_CAL_MANUAL 0 H Enables “manual” VCO calibration (test only)
TEST3[6] VCO_CAL_OVERRIDE 0 H Override VCO current calibration
0: Use calibrated value
1: Use VCO_CO[5:0] value
VCO_CAL_OVERRIDE controls VCO_CAL_CLK
if VCO_CAL_MANUAL=1. Negative transitions are then used to
sample VCO_CAL_COMP.
TEST3[5:0] VCO_CO[5:0] 6 — VCO_CAL_CURRENT override value
78 Detailed Description
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