HSP50016 データシートの表示（PDF） - Intersil
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HSP50016 Datasheet PDF : 31 Pages
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HSP50016
TABLE 8. HDF/OUTPUT REGISTER (Continued)
DESTINATION ADDRESS = 5
BIT
POSITION
FUNCTION
DESCRIPTION
20-5
Scaling Multiplier Gain
(Scale Factor)
16-Bit HDF Gain Compensation Number - the multiplier portion.
Range: 1 ≤ Scale Factor < 2,
Field Format = 20.2-1...2-15.
Calculate the value for this field using this equation:
Scale Factor = 2CEILING(5log2(R))/(R)5; where R is the HDF decimation (rate change) factor and CEIL-
ING(x) is equal to x for integer values, otherwise is equal to the next higher integer.
Common HDF decimation factors (R), decimation counter preload (DCP) and Scale Factors (SF) values:
R
16
128
512
1,024
2,048
4,096
8,192
16,384
32,768
DCP(dec)
15
127
511
1,023
2,047
4,095
8,191
16,382
32,768
DCP(hex)
000f
007f
01ff
03ff
07ff
0fff
1fff
3fff
7fff
SF(dec)
1.000
1.000
1.00
1.000
1.000
1.000
1.00
1.00
1.000
SF(hex)
8000
8000
8000
8000
8000
8000
8000
8000
8000
Note that the Scale Factor is 1 (8000hex) for power of 2 decimation factors.
The compensation for the HDF gain is performed with a shifter and a multiplier. Thus to program the HDF
Gain compensation, there is an associated Shift Factor and the Scale Factor. As the Decimation Factor
increases, the multiplier moves away from the value 1 and approaches the value 2. When the calculated
value for the multiplier equals or exceeds 2, the shifter is incremented and the multiplier returns to 1 and
increases towards 2 again as the Decimation Factor increases.
As an example, the table below details the values of Scale Factor for values of R from 16 to 32:
R DCP(dec) DCP(hex)
SF(dec)
SF(hex)
16
15
000f
1.000000000 8000
17
16
0010
1.477013647 BD0E
18
17
0011
1.109857915 8E0F
19
18
0012
1.693916116 D8D2
20
19
0013
1.310720000 A7C5
21
20
0014
1.026983417 8374
22
21
0015
1.627707993 D058
23
22
0016
1.303318981 A6D3
24
23
0017 1.053497942 86D9
25
24
0018
1.717986918 DBE6
26
25
0019
1.412060017 B4BE
27
26
001a
1.169233029 95A9
28
27
001b
1.949663831 F98E
29
28
001c
1.635911864 D165
30
29
001d
1.380840823 B0BF
31
30
001e
1.172037271 9605
32
31
001f
1.000000000 8000
4-3
Output
Format
00 = Two’s Complement
01 = Offset Binary
10 = Sign Magnitude
11 = Single Precision Floating Point Format
3-215
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