I2781AG-08SR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Frequency Modulator, Spread Spectrum Clock Generator
PLL:	Yes
Input:	Clock, Crystal
Output:	Clock
Number of Circuits:	1
Ratio - Input:Output:	1:1
Differential - Input:Output:	No/No
Frequency - Max:	78MHz
Divider/Multiplier:	Yes/No
Voltage - Supply:	3 V ~ 3.6 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	P278*A

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The I2781AG-08SR is a programmable clock generator and frequency synthesizer with an output frequency range of 0.75 MHz to 233.3 MHz. It is designed to reduce the number of discrete components and ultimately save board space. It is an ideal solution for applications that require high accuracy timing and synchronization such as embedded systems, telecom, automotive and aerospace systems.The I2781AG-08SR uses phase-locked-loop (PLL) technology to synthesize small frequency increments, providing ultra-accurate, low noise performance. The device also boasts a low jitter, low power consumption and a wide range of operational frequencies from 0.75MHz to 233.3 MHz.The I2781AG-08SR features an internal 16-bit programmable digital signal processor (DSP) that allows for a wide range of output frequency configurations. The device can be programmed through a standard 8-bit CMOS parallel port or an external controller with I2C or SPI communication protocols. The I2781AG-08SR is protected against over-temperature, under-voltage and electromagnetic interference (EMI).The main applications for the I2781AG-08SR are as a clock generator in embedded systems and telecom systems, automotive and aerospace applications, and in microwave instruments. In addition, the device has the ability to generate several output clock frequencies simultaneously thanks to its multiple clock synchronous outputs.The I2781AG-08SR utilizes a direct digital synthesis (DDS) approach to generate its high frequency output clocks. It contains a phase-locked-loop (PLL) circuit with a voltage attempted oscillaTOr (VCO) and a phase-frequency detector (PFD). This circuit allows the device to generate a high frequency signal with an ultra-low jitter.The clock signal output of the device can be configured using the 16-bit DSP and the programmable control register. This register, located in the power supply section of the device, is used to control the frequency configuration, the output signal type, and other parameters.In addition, the I2781AG-08SR supports synchronous, asynchronous and spread spectrum clocking, as well as crystal and ceramic resonator resonators. The device is programmed using a 28-pin DIP header and provides support for up to four clock sources.The main working principle of the I2781AG-08SR is to generate multiple clocks from a single input clock source. The device is able to do this by synthesizing frequency increments with an internal PLL circuit. This PLL circuit contains a frequency generator, voltage controlled oscillator, phase frequency detector and 16-bit digital signal processor. The device outputs clock signals of different frequencies that can be selected and configured through the programmable register. The I2781AG-08SR can be used in a variety of applications, including embedded systems, telecom, automotive and aerospace systems, and microwave instruments. It offers a wide range of output frequencies, a low jitter, low power consumption and protection against over-temperature, under-voltage and EMI. Additionally, the device offers synchronous, asynchronous, spread spectrum clocking, as well as support for up to four clock sources. Through this programmable device, the number of discrete components can be greatly reduced, leading to a smaller board space.

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