Datasheet > FS6370-01-XTP

FS6370-01-XTP

更新时间： 2024-01-10 06:05:33

品牌	Logo	应用领域
AMI		光电二极管
页数	文件大小	规格书
24页	328K
描述
Clock Generator, CMOS, PDSO16,

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技术参数
数据手册

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FS6370-01-XTP 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SOP, SOP16,.25	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDSO-G16
端子数量：	16	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	3.3/5 V	认证状态：	Not Qualified
子类别：	Clock Generators	最大压摆率：	43 mA
表面贴装：	YES	技术：	CMOS
温度等级：	COMMERCIAL	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
Base Number Matches：	1

FS6370-01-XTP 数据手册

Data Sheet

FS6370-01/FS6370-01g EEPROM Programmable 3-PLL Clock Generator IC

For example, a fixed divide-by-eight pre-scaler could have been used in the feedback divider. Unfortunately, a divide-by-eight would limit the effective

modulus of the entire feedback divider to multiples of eight. This limitation would restrict the ability of the PLL to achieve a desired input-frequency-to-

output-frequency ratio without making both the reference and feedback divider values comparatively large. Generally, very large values are undesirable

as they degrade the bandwidth of the PLL, increasing phase jitter and acquisition time.

To understand the operation of the feedback divider, refer to Figure 4. The M-counter (with a modulus always equal to M) is cascaded with the dual-

modulus pre-scaler. The A-counter controls the modulus of the pres-caler. If the value programmed into the A-counter is A, the pre-scaler will be set to

divide by N+1 for A pre-scaler outputs. Thereafter, the prescaler divides by N until the M-counter output resets the A-counter, and the cycle begins again.

Note that N=8, and A and M are binary numbers.

Dual

Modulus

Prescaler

f_VCO

f_PD

Counter

FBKDIV[2:0]

FBKDIV[10:3]

Counter

Figure 4: Feedback Divider

Suppose that the A-counter is programmed to zero. The modulus of the pre-scaler will always be fixed at N; and the entire modulus of the feedback divider

becomes MxN.

Next, suppose that the A-counter is programmed to a one. This causes the pre-scaler to switch to a divide-by-N+1 for its first divide cycle and then revert

to a divide-by-N. In effect, the A-counter absorbs (or "swallows") one extra clock during the entire cycle of the feedback divider. The overall modulus is

now seen to be equal to MxN+1.

This example can be extended to show that the feedback divider modulus is equal to MxN+A, where A<M.

3.1.3 Feedback Divider Programming

For proper operation of the feedback divider, the A-counter must be programmed only for values that are less than or equal to the M-counter. Therefore,

not all divider moduli below 56 are available for use. This is shown in Table 2.

Above a modulus of 56, the feedback divider can be programmed to any value up to 2047.

Table 2: Feedback Divider Modulus Under 56

A-Counter: FBKDIV[2:0]

M-Counter:

FBKDIV[10:3]

000

001

010

011

100

101

110

111

00000001

00000010

00000011

00000100

00000101

00000110

00000111

Feedback Divider Modulus

AMI Semiconductor - Rev. 2.0, Mar. 05

www.amis.com.

1 2 345 6 7...24

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与FS6370-01-XTP相关器件

型号	品牌	描述	获取价格	数据表
FS6377	ONSEMI	Programmable 3-PLL Clock Generator IC	获取价格
FS6377-01	AMI	Programmable 3-PLL Clock Generator IC	获取价格
FS6377-01G	AMI	Programmable 3-PLL Clock Generator IC	获取价格
FS6377-01G-XTD	ONSEMI	Programmable 3-PLL Clock Generator IC	获取价格
FS6377-01G-XTP	ONSEMI	Programmable 3-PLL Clock Generator IC	获取价格
FS6377-01I	ONSEMI	暂无描述	获取价格

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