AD9552BCPZ-REEL7

振荡器上变频器 Oscillator Frequency Upconverter

Product Details

The AD9552 is a fractional-N phase locked loop PLL based clock generator designed specifically to replace high frequency crystal oscillators and resonators. The device employs a sigma-delta Σ-Δ modulator SDM to accommodate fractional fre-quency synthesis. The user supplies an input reference signal by connecting a single-ended clock signal directly to the REF pin or by connecting a crystal resonator across the XTAL pins.

The AD9552 is pin programmable, providing one of 64 standard output frequencies based on one of eight common input frequen-cies. The device also has a 3-wire SPI interface, enabling the user to program custom input-to-output frequency ratios.

The AD9552 relies on an external capacitor to complete the loop filter of the PLL. The output is compatible with LVPECL, LVDS, or single-ended CMOS logic levels, although the AD9552 is implemented in a strictly CMOS process.

The AD9552 is specified to operate over the extended industrial temperature range of −40°C to +85°C.

**Applications**

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Cost effective replacement of high frequency VCXO, OCXO, and SAW resonators

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Extremely flexible frequency translation with low jitter for SONET/SDH including FEC , 10 Gb Ethernet, Fibre Channel, and DRFI/DOCSIS

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High-definition video frequency translation

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Wireless infrastructure

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Test and measurement including handheld devices

### Features and Benefits

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Converts a low frequency input reference signal to a high frequency output signal

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Input frequencies from 6.6 MHz to 112.5 MHz

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Output frequencies up to 900 MHz

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Preset pin programmable frequency translation ratios

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Arbitrary frequency translation ratios via SPI port

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On-chip VCO

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Accepts a crystal resonator and/or an external oscillator as a reference frequency source

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Secondary output either integer-related to the primary output or a copy of the reference input

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RMS jitter: <0.5 ps

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SPI-compatible, 3-wire programming interface

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Single supply 3.3 V

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Very low power: <400 mW under most conditions

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Small package size 5 mm × 5 mm