Datasheet

Table 24. Conversion Results Registers Description (continued)
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ADDRESS
NAME DESCRIPTION
CDh Hit5UPInt
15-bit xed-point integer value of the fth hit in the upstream direction. This integer portion is
a binary representation of the number of t
4MHz
periods that contribute to the time results. The
maximum size of the integer is 7FFFh or (2
15
- 1) x t
4MHz
.
CEh Hit5UPFrac
16-bit fractional value of the fth hit in the upstream direction. This fractional portion is a binary
representation of one t
4MHz
period quantized to a 16-bit resolution. The maximum size of the
fraction is FFFFh or (2
16
- 1)/2
16
x t
4MHz
.
CFh Hit6UPInt
15-bit xed-point integer value of the sixth hit in the upstream direction. This integer portion is
a binary representation of the number of t
4MHz
periods that contribute to the time results. The
maximum size of the integer is 7FFFh or (2
15
- 1) x t
4MHz
.
D0Fh Hit6UPFrac
16-bit fractional value of the sixth hit in the upstream direction. This fractional portion is a binary
representation of one t
4MHz
period quantized to a 16-bit resolution. The maximum size of the
fraction is FFFFh or (2
16
- 1)/2
16
x t
4MHz
.
D1h AVGUPInt
15-bit xed-point integer value of the average of the hits recorded in the upstream direction This
integer portion is a binary representation of the number of t
4MHz
periods that contribute to the
time results. The maximum size of the integer is 7FFFh or (2
15
- 1) x t
4MHz
.
D2h AVGUPFrac
16-bit fractional value of the average of the hits recorded in the upstream direction. This
fractional portion is a binary representation of one t
4MHz
period quantized to a 16-bit resolution.
The maximum size of the fraction is FFFFh or (2
16
- 1)/2
16
x t
4MHz
.
D3h WVRDN
Bit 15 through Bit 8 holds the 8 bit value of the pulse width ratio (t
1
/t
2
).for the downstream
measurement. Each bit is weighted as follows:
BIT 15 BIT 14 BIT 13 BIT 12 BIT 11 BIT 10 BIT 9 BIT 8
1 0.5 0.25 0.125 0.0625 0.03125 0.015625 0.0078125
Bit 7 thru bit 0 holds the 8 bit value of the pulse width ratio (t
2/
t
ideal
) where t
ideal
is equal to half
the period of the pulse launch frequency for the downstream measurement. Each bit is weighted
as follows:
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
1 0.5 0.25 0.125 0.0625 0.03125 0.015625 0.0078125
The maximum value of each of these ratios is 1.9921875.
D4h Hit1DNInt
15-bit xed-point integer value of the rst hit in the downstream direction. This integer portion is
a binary representation of the number of t
4MHz
periods that contribute to the time results. The
maximum size of the integer is 7FFFh or (2
15
- 1) x t
4MHz
.
D5h Hit1DNFrac
16-bit fractional value of the rst hit in the downstream direction. This fractional portion is a
binary representation of one t
4MHz
period quantized to a 16-bit resolution. The maximum size of
the fraction is FFFFh or (2
16
- 1)/2
16
x t
4MHz
.
D6h Hit2DNInt
15-bit xed-point integer value of the second hit in the downstream direction. This integer portion
is a binary representation of the number of t
4MHz
periods that contribute to the time results. The
maximum size of the integer is 7FFFh or (2
15
- 1) x t
4MHz
.
MAX35101 Time-to-Digital Converter with Analog Front-End
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