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73M1903-IM/F

更新时间： 2024-02-29 00:38:58

品牌	Logo	应用领域
TERIDIAN		调制解调器
页数	文件大小	规格书
46页	530K
描述
Modem Analog Front End

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中文翻译

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技术参数
数据手册

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73M1903-IM/F 技术参数

生命周期：	Transferred	包装说明：	ROHS COMPLIANT, MO-153AC, TSSOP-20
Reach Compliance Code：	unknown	风险等级：	5.59
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	R-PDSO-G20
长度：	6.5 mm	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	认证状态：	Not Qualified
座面最大高度：	1.1 mm	最大供电电压 (Vsup)：	3.6 V
最小供电电压 (Vsup)：	3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
宽度：	4.4 mm	Base Number Matches：	1

73M1903-IM/F 数据手册

DS_1903_032

73M1903 Data Sheet

Example 3:

Crystal Frequency = 27 MHz; Desired Sampling Rate, Fs = 7.2 kHz

Step 1. First compute the required VCO frequency, Fvco, corresponding to

Fs = 2.4 kHz x 3 = 7.2 kHz.

Fvco = 2 x 2304 x Fs = 2 x 2304 x 2.4 kHz x 3 = 33.1776 MHz.

Step 2. Express the required VCO frequency divided by the Crystal Frequency as a ratio of two integers.

This is initially given by:

2 • 2304 • 2.4kHz •3

Fvco / Fxtal

27MHz

After a few rounds of simplification this reduces to:

Fvco/ Fxtal = (

) • (

)

125

Nnco1

Dnco1

Nnco2

125

Dnco2

The two ratios are not unique and many other possibilities exist. But for this particular application, they

are found to be the best set of choices within the constraints of Prst and Nrst allowed. (Nnco1, Nnco2

must be less than or equal to 8.)

The ratio, Nnco1/Dnco1 = 8/125, is used to form a divide ratio for the NCO in prescaler and Nnco2/Dnco2

=5/96 for the NCO in the PLL.

Pre-scaler NCO: From Nnco1/Dnco1 = 8/125,

Pdvsr = Integer [ Dnco1/Nnco1 ] = 15;

Prst[2:0] = Nnco1 – 1 = 7;

Dnco1/Nnco1 = 125/8 = 15.625 suggests a divide sequence of {÷16,÷16,÷15,÷16,÷16,÷15,÷16,÷15}, or

Pseq = {1,1,0,1,1,0,1,0} = DAh.

PLL NCO: From Nnco2/Dnco2 = 5/96,

Ndvsr = Integer [ Dnco2/Nnco2 ] = 19;

Nrst[2:0] = Nnco2 – 1 = 4;

Dnco2/Nnco2 = 19.2 suggests a divide sequence of {÷19, ÷19, ÷19, ÷19, ÷20}, or

Nseq = {x,x,x,0,0,0,0,1} = x1h.

Rev. 2.0

1...42 43 444546

中文翻译

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