Texas Instruments AFE79 Series - 2.12.1 Register 40 h (offset = 40 h) [reset = 2 h]; 2.12.2 Register 44 h (offset = 44 h) [reset = 1 Ah]

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SBAU337–May 2020
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Serial Interface Register Maps
2.12.1 Register 40h (offset = 40h) [reset = 2h]
Figure 2-1204. Register 40h
7 6 5 4 3 2 1 0
TX_DUC_DAC_TO_DIG_CLOCK_RATIO
R/W-2h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-1216. Register 40 Field Descriptions
Bit Field Type Reset Description
2-0
TX_DUC_DAC_TO
_DIG_CLOCK_RA
TIO
R/W 2h
DAC clock to TX digital clock ratio. Valid values: 2, 3 and 4.
2 : TXDCLK = FDAC/2
4 : TXDCLK = FDAC/4
3 : FDAC/3
0 : unused
1 : unused
5 : unused
6 : unused
7 : unused
2.12.2 Register 44h (offset = 44h) [reset = 1Ah]
Figure 2-1205. Register 44h
7 6 5 4 3 2 1 0
TX_DUC_INTERPOLATOR1_CONFIG
R/W-1Ah
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 2-1217. Register 44 Field Descriptions
Bit Field Type Reset Description
6-0
TX_DUC_INTERP
OLATOR1_CONFI
G
R/W 1Ah
Interpolator1 Configuration. The value to the programmed is a
function of the interpolation1 interpolation factor as well as (in
some cases) the mixer1 mode configuration, interpolation2
configuration, etc. The correct/optimal value to use is
automatically determined if System Configuration Macros are
used. Not all interpolation1 interpolation factors are valid for all
DAC rates and/or DAC/DIG clock ratios, so it is highly
recommended that the System Configuration Macros be used.
00: Interpolation1 factor = 8
02: Interpolation1 factor = 12
04: Interpolation1 factor = 20
10: Interpolation1 factor = 6
12: Interpolation1 factor = 10
16: Interpolation1 factor = 4
24: Interpolation1 factor = 2
25: Interpolation1 factor = 1 (directly use Interpolation2)
26, 58, 90: Interpolation1 factor = 3 (value depends on mixer
mode, and other parameters)
28: Interpolation1 factor = 5
The System Configuration Macros automatically partition the
overall required interpolation factor power optimally between
the interpolation1 and interpolation2 sections, for single and
dual band scenarios, taking into account multiple factors. It is
highly recommended that the System Configuration Macros be
used.