Overview
The AD9571ACPZPEC-R7, produced by Analog Devices Inc., is a highly integrated Ethernet clock generator designed to meet the stringent requirements of Ethernet line card applications. This device features a dedicated PLL core optimized for low jitter and low phase noise, making it ideal for high-performance networking equipment. The AD9571 integrates a fully functional VCO/PLL core, loop filters, and multiple output buffers, eliminating the need for external loop filter components and thus conserving design time and board space.
Key Specifications
| Parameter | Description |
|---|---|
| Input Frequency | 25 MHz (crystal or clock) |
| Output Frequencies | 25 MHz (CMOS, 6 copies), 156.25 MHz (LVPECL/LVDS), 100 MHz or 125 MHz (LVPECL/LVDS, 2 copies), 33.33 MHz (CMOS) |
| Jitter Performance | 0.17 ps rms jitter from 1.875 MHz to 20 MHz at 156.25 MHz, 0.41 ps rms jitter from 12 kHz to 20 MHz at 125 MHz |
| Output Formats | LVPECL, LVDS, CMOS |
| Package Type | 40-lead LFCSP (6 mm × 6 mm) |
| Power Dissipation | 0.48 W (LVDS operation), 0.69 W (LVPECL operation) |
| Supply Voltage | 3.3 V |
| Operating Temperature | −40°C to +85°C |
Key Features
- Fully integrated VCO/PLL core with low noise phase frequency detector (PFD) and precision charge pump (CP)
- Integrated loop filter and regulators for supply noise immunity
- Multiple output buffers with choice of LVPECL or LVDS output formats
- Preset divide ratios for common Ethernet frequencies (156.25 MHz, 33.33 MHz, 100 MHz, 125 MHz)
- Six copies of the 25 MHz reference clock output available
- Space-saving 6 mm × 6 mm 40-lead LFCSP package
- No external loop filter components required
Applications
- Ethernet line cards, switches, and routers
- SCSI, SATA, and PCI-express applications
- Other applications requiring low jitter and low phase noise clock generation
Q & A
- What is the primary function of the AD9571ACPZPEC-R7?
The AD9571ACPZPEC-R7 is a multioutput clock generator optimized for Ethernet line card applications, providing low jitter and low phase noise clock signals.
- What are the input frequency options for the AD9571?
The AD9571 can accept an input crystal or clock frequency of 25 MHz.
- What output frequencies are available from the AD9571?
The device provides output frequencies of 25 MHz (CMOS, 6 copies), 156.25 MHz (LVPECL/LVDS), 100 MHz or 125 MHz (LVPECL/LVDS, 2 copies), and 33.33 MHz (CMOS).
- What is the jitter performance of the AD9571?
The AD9571 offers 0.17 ps rms jitter from 1.875 MHz to 20 MHz at 156.25 MHz and 0.41 ps rms jitter from 12 kHz to 20 MHz at 125 MHz.
- What output formats are supported by the AD9571?
The device supports LVPECL, LVDS, and CMOS output formats.
- What is the package type and size of the AD9571?
The AD9571 is packaged in a 40-lead LFCSP with dimensions of 6 mm × 6 mm.
- What is the power dissipation of the AD9571?
The power dissipation is 0.48 W for LVDS operation and 0.69 W for LVPECL operation.
- What is the operating supply voltage of the AD9571?
The device operates from a single 3.3 V supply.
- What is the operating temperature range of the AD9571?
The operating temperature range is −40°C to +85°C.
- Does the AD9571 require external loop filter components?
No, the AD9571 does not require external loop filter components.
