参数资料
型号: AD9547BCPZ-REEL7
厂商: Analog Devices Inc
文件页数: 5/104页
文件大小: 0K
描述: IC CLOCK GEN/SYNCHRONIZR 64LFCSP
产品变化通告: AD9547 Mask Change 20/Oct/2010
标准包装: 750
类型: 时钟/频率发生器,同步器
PLL:
主要目的: 以太网,SONET/SDH,Stratum
输入: CMOS,LVDS,LVPECL
输出: CMOS,LVDS,LVPECL
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 是/是
频率 - 最大: 750kHz
电源电压: 1.71 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 带卷 (TR)
AD9547
Data Sheet
Rev. E | Page 102 of 104
The min() function
y = min(x0, x1, ... xn)
where:
x0 through xn is a list of real numbers.
y is the number in the list that is the farthest tothe left on the
number line.
The max() function
y = max(x0, x1, ... xn)
where:
x0 through xn is a list of real numbers.
y is the number in the list that is the farthest to the right on the
number line.
The log2() function
log2(x) =
)
2
(
)
(
ln
x
ln
where: ln() is the natural log function.
x is a positive, nonzero number.
Assume that the coefficient calculations for α, β, γ, and δ above
yield the following results:
α = 0.012735446
β = 6.98672 × 105
γ = 7.50373 × 105
δ = 0.002015399
These values are floating point numbers that must be quantized
according to the bit widths of the linear and exponential com-
ponents of the coefficients as they appear in the register map.
Note that the calculations that follow indicate a positive value
for the register entries of β and γ. The reason is that β and γ,
which are supposed to be negative values, are stored in the
AD9547 registers as positive values. The AD9547 converts the
stored values to negative numbers within its signal processing
core. A detailed description of the register value computations
for α, β, γ, and δ follows.
Calculation ofthe α RegisterValues
The quantized α coefficient consists of four components: α0, α1,
α2, and α3, according to
α ≈ αquantized = α0 × 216 α1 2 + α3
where:
α0, α1, α2, and α3 are the register values.
α2 provides front-end gain.
α3 provides back-end gain.
α1 shifts the binary decimal point of α0 to the left to accommodate
small values of α.
Calculation of α1 is a two-step process, as follows:
w = if(α <1, ceil(log2(α)), 0)
α1 = if(α <1, min[63, max(0, w)], 0)
If gain is necessary (that is, α > 1), then it is beneficial to apply
most or all of it to the front-end gain (α2) implying that the cal-
culation of α2 is to be done before that of α3. Calculation of α2
is a three-step process that leads directly to the calculation of α3.
x = if(α > 1, ceil(log2(α)), 0)
y = if(α > 1, min[22, max(0, x)], 0)
α2 = if(y ≥ 8, 7, y)
α3 = if(y ≥ 8, y – 7, 0)
Calculation of α0 is a two-step process, as follows:
z = round(α × 216+ α1 α2 α3)
α0 = min[65535, max(1, z)
Using the example value of α = 0.012735446 yields
w = 6, so α1 = 6
x = 0 and y = 0, so α2 = 0 and α3 = 0
z = 53416.332099584, so α0 = 53416
This leads to the following quantized value, which is very close
to the desired value of 0.012735446:
αquantized = 53416 × 222 ≈ 0.01273566821
相关PDF资料
PDF描述
AD9548BCPZ-REEL7 IC CLOCK GEN/SYNCHRONIZR 88LFCSP
AD9549ABCPZ-REEL7 IC CLOCK GEN/SYNCHRONIZR 64LFCSP
AD9550BCPZ-REEL7 IC INTEGER-N TRANSLATOR 32-LFCSP
AD9551BCPZ IC CLOCK GEN MULTISERV 40-LFCSP
AD9552BCPZ-REEL7 IC PLL CLOCK GEN LP 32LFCSP
相关代理商/技术参数
参数描述
AD9548 制造商:AD 制造商全称:Analog Devices 功能描述:Quad/Octal Input Network Clock Generator/Synchronizer
AD9548/PCBZ 功能描述:BOARD EVAL FOR AD9548 RoHS:是 类别:编程器,开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理,热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板,CD,电源
AD9548/PCBZ 制造商:Analog Devices 功能描述:Clock Generator Evaluation Board
AD9548BCPZ 功能描述:IC CLOCK GEN/SYNCHRONIZR 88LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1 系列:- 类型:时钟/频率发生器,多路复用器 PLL:是 主要目的:存储器,RDRAM 输入:晶体 输出:LVCMOS 电路数:1 比率 - 输入:输出:1:2 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3 V ~ 3.6 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP(0.173",4.40mm 宽) 供应商设备封装:16-TSSOP 包装:Digi-Reel® 其它名称:296-6719-6
AD9548BCPZ-REEL7 功能描述:IC CLOCK GEN/SYNCHRONIZR 88LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:28 系列:- 类型:时钟/频率发生器 PLL:是 主要目的:Intel CPU 服务器 输入:时钟 输出:LVCMOS 电路数:1 比率 - 输入:输出:3:22 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:64-TFSOP (0.240",6.10mm 宽) 供应商设备封装:64-TSSOP 包装:管件