FS6377-01

更新时间： 2024-02-09 10:04:47

品牌	Logo	应用领域
AMI		晶体时钟发生器微控制器和处理器外围集成电路光电二极管
页数	文件大小	规格书
21页	1496K
描述
Programmable 3-PLL Clock Generator IC

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技术参数
数据手册

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FS6377-01 技术参数

生命周期：	Obsolete	Reach Compliance Code：	unknown
风险等级：	5.75	JESD-30 代码：	R-PDSO-G16
端子数量：	16	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：	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	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

FS6377-01 数据手册

Data Sheet

FS6377-01/FS6377-01g Programmable 3-PLL Clock Generator IC

3.1.1 Reference Divider

The reference divider is designed for low phase jitter. The

divider accepts the output of the reference oscillator and

provides a divided-down frequency to the PFD. The

reference divider is an 8-bit divider, and can be

programmed for any modulus from 1 to 255 by

programming the equivalent binary value. A divide-by-256

can also be achieved by programming the eight bits to

00h.

3.1.2 Feedback Divider

The feedback divider is based on a dual-modulus pre-

scaler technique. The technique allows the same

granularity as a fully programmable feedback divider,

while still allowing the programmable portion to operate at

low speed. A high-speed pre-divider (also called a

prescaler) is placed between the VCO and the

programmable feedback divider because of the high

speeds at which the VCO can operate. The dual-modulus

technique insures reliable operation at any speed that the

VCO can achieve and reduces the overall power

consumption of the divider.

To understand the operation, refer to Figure 4. The M-

counter (with a modulus always equal to M) is cascaded

with the dual-modulus prescaler. The A-counter controls

the modulus of the prescaler. If the value programmed into

the A-counter is A, the prescaler will be set to divide by

N+1 for A prescaler 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.

Suppose that the A-counter is programmed to zero. The

modulus of the prescaler will always be fixed at N; and the

entire modulus of the feedback divider becomes MxN.

For example, a fixed divide-by-eight could be 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.

Next, suppose that the A-counter is programmed to a one.

This causes the prescaler 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.

A large feedback modulus means that the divided VCO

frequency is relatively low, requiring a wide loop band-

width to permit the low frequencies. A narrow loop band-

width tuned to high frequencies is essential to minimizing

jitter; therefore, divider moduli should always be as small

as possible.

This example can be extended to show that the feedback

divider modulus is equal to MxN+A, where A<M.

Dual

Modulus

Prescaler

f_VCO

f_PD

Counter

FBKDIV[2:0]

FBKDIV[10:3]

Counter

Figure 4: Feedback Divider

AMI Semiconductor

www.amis.com

1 234 5 6 7...21

中文翻译

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与FS6377-01相关器件

型号	品牌	获取价格	描述	数据表
FS6377-01G	AMI	获取价格	Programmable 3-PLL Clock Generator IC
FS6377-01G-XTD	ONSEMI	获取价格	Programmable 3-PLL Clock Generator IC
FS6377-01G-XTP	ONSEMI	获取价格	Programmable 3-PLL Clock Generator IC
FS6377-01I	ONSEMI	获取价格	暂无描述
FS6377-01IG	AMI	获取价格	Clock Generator, 150MHz, CMOS, PDSO16, 0.150 INCH, GREEN, SOIC-16
FS6377-01IG-XTD	ONSEMI	获取价格	Programmable 3-PLL Clock Generator IC
FS6377-01IG-XTP	ONSEMI	获取价格	Programmable 3-PLL Clock Generator IC
FS6377-01ITR	AMI	获取价格	Clock Generator, CMOS, PDSO16,
FS650R08A4P2	INFINEON	获取价格	Wave baseplate
FS660R08A6P2FB	INFINEON	获取价格	Short Tabs

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