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73M1903C-IMR/F

更新时间： 2024-01-25 08:31:02

品牌	Logo	应用领域
TERIDIAN		调制解调器消费电路商用集成电路
页数	文件大小	规格书
46页	452K
描述
Modem Analog Front End

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技术参数
数据手册

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73M1903C-IMR/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

73M1903C-IMR/F 数据手册

73M1903C

Modem Analog Front End

DATA SHEET

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•10/7• 4

Fvco/ Fxtal =

24.576MHz

After a few rounds of simplification this ratio reduces to:

Nnco1

Fvco / Fxtal

= (

) • (

)

Dnco1

Nnco2

Dnco2

, where Nnco1 and Nnco2 must be < or equal to 8.

The ratio, Nnco1/Dnco1 = 1/7, is used to form a divide ratio for the NCO in prescaler and Nnco2/Dnco2 =

1/18 for the NCO in the PLL.

Prescaler NCO: From Nnco1/Dnco1 = 1/7,

Pdvsr = Integer [nco1/Nnco1] = 7;

Prst[2:0] = Nnco1 – 1 = 0; this means NO fractional divide. It always does ÷7. Thus Pseq becomes

“don’t care” and is ignored.

Pseq = {x,x,x,x,x,x,x,x} = xxh.

PLL NCO: From Nnco2/Dnco2 = 1/18,

Ndvsr = Integer [Dnco2/Nnco2] = 18;

Nrst[2:0] = Nnco2 – 1 = 0; this means NO fractional divide. It always does ÷18. Thus Pseq becomes

“don’t care” and is ignored.

Nseq = {x,x,x,x,x,x,x,x} = xxh.

Example 2:

Crystal Frequency = 24.576MHz; Desired Sampling Rate, Fs = 10.971kHz=2.4kHz x 8/7 x4

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

Fs = 2.4kHz x 8/7 x 4 =10.971kHz.

Fvco = 2 x 2304 x Fs = 2 x 2304 x 2.4kHz x 8/7 x 4 = 50.55634MHz.

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•8/7• 4

Fvco/ Fxtal

24.576MHz

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