The quantized γ coefficient consists of two component" />
參數(shù)資料
型號: AD9548BCPZ-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 15/112頁
文件大?。?/td> 0K
描述: IC CLOCK GEN/SYNCHRONIZR 88LFCSP
產(chǎn)品變化通告: AD9548 Mask Change 20/Oct/2010
標(biāo)準(zhǔn)包裝: 400
類型: 時(shí)鐘/頻率發(fā)生器,同步器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 750kHz
電源電壓: 1.71 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 88-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 88-LFCSP-VQ(12x12)
包裝: 帶卷 (TR)
Data Sheet
AD9548
Rev. E | Page 111 of 112
CALCULATION OF THE γ REGISTER VALUES
The quantized γ coefficient consists of two components, γ0 and
γ1 according to
)
17
(
2
1
0
quantized
γ
+
×
=
where γ0 and γ1 are the register values. Calculation of γ1 is a two-
step process that leads to the calculation of γ0, which is also a
two-step process.
))
(
(log
ceil
2
γ
=
x
[
])
,
0
max(
,
31
min
x
1 =
γ
)
2
(
round
17
1
y
γ
+
×
=
[
])
,
1
max(
,
071
,
131
min
y
0 =
γ
Using the example value of γ = 7.50373 × 105 yields
x = 13, so γ1 = 13
y = 80,570.6873700352, so γ1 = 80,571
This leads to the following quantized value, which is very close
to the desired value of 7.50373x105:
5
30
10
503759116
.
7
2
80571
×
×
=
quantized
γ
CALCULATION OF THE δ REGISTER VALUES
The quantized δ coefficient consists of two components, δ0 and
δ1, according to
)
15
(
2
1
0
quantized
δ
+
×
=
where δ0 and δ1 are the register values.
Calculation of δ1 is a two-step process that leads to the
calculation of δ0, which is also a two-step process.
))
(
(log
ceil
2 δ
=
x
[
])
,
0
max(
,
31
min
x
1 =
δ
)
2
(
round
15
1
y
δ
+
×
=
[
])
,
1
max(
,
767
,
32
min
y
0 =
δ
Given the example value of δ = 0.002015399, the preceding
formulas yield
x = 8, δ1 = 8
y = 16,906.392174592, δ0 = 16,906
This leads to the following quantized value, which is very close
to the desired value of 0.002015399:
49
0020153522
.
0
2
16906
23
×
=
quantized
δ
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