Overview
The AD9557BCPZ, produced by Analog Devices Inc., is a low loop bandwidth clock multiplier designed to provide jitter cleanup and synchronization for various systems, including synchronous optical networks (OTN/SONET/SDH). This device operates over an industrial temperature range of −40°C to +85°C and is packaged in a 40-lead VFQFN exposed pad, CSP (Chip Scale Package).
The AD9557 generates an output clock synchronized to up to four external input references, utilizing a digital PLL to reduce input time jitter or phase noise associated with these references. The device also features digitally controlled loop and holdover circuitry, ensuring continuous generation of a low jitter output clock even when all reference inputs have failed.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage | 1.8 | 3.3 | V | ||
| Supply Current | 220 | 300 | mA | ||
| Power Dissipation | 660 | mW | |||
| Output High Voltage (VOH) | DVDD3 - 0.4 | V | IOH = 1 mA | ||
| Output Low Voltage (VOL) | 0.4 | V | IOL = 1 mA | ||
| System Clock Input Frequency Range | 10 | 600 | MHz | ||
| Output Frequency Range | 750 | 805 | MHz | ||
| Phase Frequency Detector (PFD) Rate | 150 | MHz |
Key Features
- Low loop bandwidth clock multiplier for jitter cleanup and synchronization.
- Supports up to four external input references.
- Digital PLL for reducing input time jitter or phase noise.
- Digitally controlled loop and holdover circuitry for continuous low jitter output clock generation even when all reference inputs have failed.
- Operates over an industrial temperature range of −40°C to +85°C.
- Serial interface (SPI or I2C) and on-chip EEPROM for storing multiple power-up profiles.
- Supports network synchronization, including synchronous Ethernet and SDH to OTN mapping/demapping.
- Cleanup of reference clock jitter and phase transient control.
Applications
- Network synchronization, including synchronous Ethernet and SDH to OTN mapping/demapping.
- Cleanup of reference clock jitter.
- SONET/SDH/OTN clocks up to 100 Gbps, including FEC.
- Stratum 3 holdover, jitter cleanup, and phase transient control.
- Wireless base station controllers.
- Cable infrastructure.
- Data communications.
Q & A
- What is the primary function of the AD9557?
The AD9557 is a low loop bandwidth clock multiplier that provides jitter cleanup and synchronization for various systems, including synchronous optical networks (OTN/SONET/SDH).
- What is the operating temperature range of the AD9557?
The AD9557 operates over an industrial temperature range of −40°C to +85°C.
- How many external input references can the AD9557 support?
The AD9557 can support up to four external input references.
- What type of interface does the AD9557 use for configuration?
The AD9557 uses a serial interface (SPI or I2C) for configuration and has on-chip EEPROM for storing multiple power-up profiles.
- What are some of the key applications of the AD9557?
Key applications include network synchronization, cleanup of reference clock jitter, SONET/SDH/OTN clocks, wireless base station controllers, cable infrastructure, and data communications.
- What is the output frequency range of the AD9557?
The output frequency range of the AD9557 is from 750 MHz to 805 MHz.
- Does the AD9557 support holdover and phase transient control?
Yes, the AD9557 supports Stratum 3 holdover, jitter cleanup, and phase transient control.
- What package type is the AD9557 available in?
The AD9557 is available in a 40-lead VFQFN exposed pad, CSP (Chip Scale Package).
- Can the AD9557 generate an output clock even when all reference inputs have failed?
Yes, the AD9557's digitally controlled loop and holdover circuitry ensure continuous generation of a low jitter output clock even when all reference inputs have failed.
- What is the phase frequency detector (PFD) rate of the AD9557?
The phase frequency detector (PFD) rate of the AD9557 is 150 MHz.
