87004AGLFT

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87004AGLFT is a clock generator, Phase-Locked-Loop (PLL), Frequency Synthesizer. It is one of the most popular products for those applications that need to generate multiple output clocks with high accuracy and low jitter.

The 87004AGLFT can generate up to four different output frequencies of various stable and programmable frequencies, and provides a variety of output formats and options including differential, single-ended, biphase, and a low jitter programmable frequency output.

The application of 87004AGLFT generally will include telecommunications networks, personal communication systems, digital radio links, motion control systems, digital signal processing systems, base stations, cable modems, and military systems. Depending on the usage, the 87004AGLFT can be used for synthesizing frequencies, timing synchronization, and signal conditioning.

The core of the 87004AGLFT is based on two primary modules: a Phase Frequency Detector (PFD) and a Voltage Controlled Oscillator (VCO). The PFD compares the external reference clock to the internally generated clock, and generates a signal with the information of the phase difference and the noise status. The VCO controls the frequency output by variation in its supply voltage, and utilizes a Loop Filter to achieve a low frequency jitter.

The outputs are available in three voltage configurations: +3.3Volts, +2.5Volts, and +1.8Volts. Options are also available with spread spectrum capability. The maximum power consumption of the 87004AGLFT is typically 1.1W at +3.3Volts, 1.0W at +2.5Volts, and 0.9W at +1.8Volts.

The 87004AGLFT supports two startup modes, nominal (the OSC_IN terminal is needed for startup) and spread spectrum, in addition to a power up/down disable mode and a power down by-pass mode. The spread spectrum mode automatically reduces the peak spectral emissions with a fixed rate of frequency hopping.

The loop settling time of the 87004AGLFT is typically less than 10us and typically phase jitter is less than 0.03ps RMS. It is compatible with the specifications of several industry standard protocols such as Real Time Clock, USB 2.0, XGMII and SONET, and complies with the SONET jitter and wander specifications.

The 87004AGLFT supports a wide frequency range, from 8kHz to 1000MHz. It has programmable output parameters including frequency, duty cycle, slew rate, voltage, spread spectrum mode and spread rate. The device also provides programming control of output enable and polarity control, as well as adjustable duty cycle, rise and fall time.

The 87004AGLFT comes in a 48 pin TQFP package. It operates over a temperature range of -40°C to +85°C and has an integrated ESD protection of up to 8KV. The device is available in speed grades from Industrial to Automotive, with features such as Adaptive Loop Timing and Resistor Electro-Migration. The 87004AGLFT is an ideal choice for applications requiring multiple output frequencies with high accuracy and low jitter.

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