RS8953SPBEPF View Datasheet(PDF) - Conexant Systems
Part Name
Description
MFG CO.
'RS8953SPBEPF' PDF : 173 Pages View PDF
RS8953B/8953SPB
HDSL Channel Unit
0xD8—DPLL Gain (DPLL_GAIN)
4.0 Registers
4.9 DPLL Configuration
7
6
5
4
3
2
1
0
—
DC_GAIN[2:0]
DC_INTEG[3:0]
DPLL_GAIN[7:0]
DPLL Gain—Filtering is controlled by two DC parameters: DC_GAIN, which represents
proportional loop gain, and DC_INTEG, which represents the filter’s integration coefficient.
The DPLL closed loop bandwidth is programmed to be in the range of 0.2 Hz to 3 Hz. The
following approximations are used to calculate DC parameters for a desired DPLL bandwidth:
DC_GAIN =
------B----W----------
N × 26.5
× 217
DC_INTEG =
(---B----W-----)---2
26.52
×
2----1--5-
N
where: N = RCLK output frequency ÷ 64000
BW = DPLL closed loop bandwidth (in Hz)
Specific DC parameter values are programmed according to the following tables:
DC_GAIN[2:0]
000
001
010
011
100
101
110
111
RS8953B
25
26
27
28
29
210
211
212
DC_INTEG[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010–1110
1111
RS8953B
2–4
2–3
2–2
2–1
1
21
22
23
24
25
26
0 (Type I)
N8953BDSB
Conexant
4-37
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