Datasheet > 844S42I

844S42I

更新时间： 2024-11-25 01:13:47

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
28页	428K
描述
Dual Output RF Frequency Synthesizer

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844S42I 数据手册

Dual Output RF Frequency Synthesizer

844S42I

Data Sheet

General Description

Features

The 844S42I is a 3.3V compatible, PLL based clock synthesizer

targeted for clock generation in high-performance instrumentation,

networking and computing applications. Using either the serial (I²C)

or parallel programming interface, the 844S42I enables the

generation of clock frequencies in the range of 81MHz to 2592MHz.

The internal crystal oscillator uses the external quartz crystal as the

basis of its frequency reference. Alternatively, a LVCMOS compatible

clock signal can be used as PLL reference signal. The devices uses

an integer-N synthesizer architecture and is optimized for low-jitter

generation. The VCO within the PLL operates over a range of

1296MHz to 2592MHz. Its output is scaled by a divider that is

configured by either the I²C or parallel interfaces. The crystal

oscillator frequency f_XTAL, the PLL pre-divider P, the feedback-divider

M and the PLL post-divider N determine the output frequency. The

feedback path of the PLL is internal.

• Programmable frequency synthesis optimized for instrumentation,

networking and computing applications

• 81MHz to 2592MHz synthesized clock output signal

• Two differential, universal LVDS or LVPECL compatible

high-frequency outputs

• Output frequency programmable through 2-wire I²C bus or

parallel interface

• On-chip crystal oscillator for reference frequency generation

• Alternative LVCMOS/LVTTL compatible reference clock input

• Clock stop and output enable functionality

• PLL lock indicator output (LVCMOS/LVTTL)

• LVCMOS/LVTTL compatible control inputs

• Fully integrated PLL

• SiGe Technology

• Full 3.3V supply voltage

• -40°C to 85°C ambient operating temperature

• Available in a lead-free (RoHS 6) compliant package

The PLL post-dividers NA and NB are configured through either the

I²C or the parallel interfaces, each can provide one of seven division

ratios (1, 2, 3, 4, 6, 8, 16). This divider extends the performance of

the part while providing a typical 50% duty cycle. The high-frequency

outputs QA and QB are differential and are capable of driving a pair

of transmission lines. The positive supply voltage for the internal PLL

is separated from the power supply for the core logic and output

drivers to minimize noise induced jitter. The serial interface is I²C

compatible and provides read and write access to the internal PLL

configuration registers. The lock state of the PLL is indicated by the

LVCMOS-compatible LOCK_DT output. The 844S42I is packaged

in a 8mm x 8mm 56-lead VFQFN package.

Pin Assignment

56 55 54 53 52 51 50 49 48 47 46 45 44 43

GND

V_DDOA

nBYPASS

V_DD

ICS844S42I

56-Lead VFQFN

8mm x 8mm x 0.925mm

package body

K Package

nQA

GND

REF_CLK

GND

REF_SEL

XTAL_IN

XTAL_OUT

nMR

Top View

nQB

V_DDOB

LOCK_DT

LEV_SEL

V_DD

15 16 17 18 19 20 21 22 23 24 25 26 27 28

Revision A April 28, 2016

12 3 4 5 6 7...28

中文翻译

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与844S42I相关器件

型号	品牌	获取价格	描述	数据表
845	AMPHENOL	获取价格	Circular Connector, Steel, Female; Male, Crimp; Solder Terminal, Plug; Receptacle
845.25%FA1020PPM-TANDR	VISHAY	获取价格	Fixed Resistor, Wire Wound, 10W, 845ohm, 700V, 0.25% +/-Tol, -20,20ppm/Cel,
845-.25%-FA1-20PPM-CARDPACK	VISHAY	获取价格	Fixed Resistor, Wire Wound, 1W, 845ohm, 44V, 0.25% +/-Tol, -20,20ppm/Cel,
845-.5%-FA2-20PPM-AMMOPACK	VISHAY	获取价格	Fixed Resistor, Wire Wound, 2W, 845ohm, 65V, 0.5% +/-Tol, -20,20ppm/Cel,
845-.5%-FA2-20PPM-TANDR	VISHAY	获取价格	Fixed Resistor, Wire Wound, 2W, 845ohm, 65V, 0.5% +/-Tol, -20,20ppm/Cel,
8450	FILTRAN	获取价格	LAN 10/100 Base-T Single Port Transformer Module
84500	FCI-CONNECTOR	获取价格	0 mm PLUG ASSEMBLY 10 X 30 = 300 POSITIONS
84500-002LF	AMPHENOL	获取价格	Board Stacking Connector, 300 Contact(s), 10 Row(s), Male, Straight, 0.05 inch Pitch, Surf
84500-102	AMPHENOL	获取价格	Board Stacking Connector, 300 Contact(s), 10 Row(s), Male, Straight, 0.05 inch Pitch, Surf
84500-102LF	AMPHENOL	获取价格	Board Stacking Connector, 300 Contact(s), 10 Row(s), Male, Straight, 0.05 inch Pitch, Surf

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