Overview
The AD9547BCPZ-REEL7 is a dual/quad input network clock generator and synchronizer produced by Analog Devices Inc. This component is designed to provide synchronization for various systems, including synchronous optical networks (SONET/SDH), Ethernet, and wireless base stations. It generates an output clock that is synchronized to one of two differential or four single-ended external input references, ensuring a clean and low-jitter output clock even when all references fail.
The device operates over an industrial temperature range of −40°C to +85°C and is packaged in a 64-lead LFCSP (Lead Frame Chip Scale Package).
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| Supply Voltage | 1.71 | - | 3.465 | V | - |
| Input High Voltage (VIH) | 2.1 | - | - | V | - |
| Input Low Voltage (VIL) | 0.8 | - | - | V | - |
| Output High Voltage (VOH) | - | 2.7 | - | V | IOH = 1 mA |
| Output Frequency | - | - | 450 | MHz | - |
| Reference Input Frequency Range | 1 kHz | - | 750 MHz | - | - |
| Operating Temperature Range | -40 | - | 85 | °C | - |
| Package Type | - | - | - | 64-lead LFCSP | - |
Key Features
- Supports Stratum 2 stability in holdover mode and Stratum 3E and Stratum 3 reference clocks.
- Automatic/manual holdover and reference switchover with phase build-out and hitless reference switchover.
- 2 pairs of reference input pins, each pair configurable as a single differential input or as 2 independent single-ended inputs.
- Programmable input reference switchover priority and 30-bit programmable input reference divider.
- 2 pairs of clock output pins, each pair configurable as a single differential LVDS/LVPECL output or as 2 single-ended CMOS outputs.
- 20-bit integer and 10-bit fractional programmable feedback divider.
- Programmable digital loop filter covering loop bandwidths from 0.001 Hz to 100 kHz.
- Optional low noise LC-VCO system clock multiplier and crystal resonator for system clock input.
- On-chip EEPROM to store multiple power-up profiles.
- Software-controlled power-down and I2C interface for configuration.
Applications
- Network synchronization and cleanup of reference clock jitter.
- SONET/SDH clocks up to OC-192, including FEC (Forward Error Correction).
- Stratum 2 holdover, jitter cleanup, and phase transient control.
- Wireless base stations and controllers.
- Cable infrastructure and data communications.
Q & A
- What is the primary function of the AD9547BCPZ-REEL7?
The AD9547BCPZ-REEL7 is a dual/quad input network clock generator and synchronizer, designed to provide synchronization for various systems.
- What is the operating temperature range of the AD9547BCPZ-REEL7?
The operating temperature range is from −40°C to +85°C.
- What types of output configurations are supported by the AD9547BCPZ-REEL7?
The device supports output configurations as single differential LVDS/LVPECL or as 2 single-ended CMOS outputs.
- What is the maximum output frequency of the AD9547BCPZ-REEL7?
The maximum output frequency is up to 450 MHz.
- Does the AD9547BCPZ-REEL7 support Stratum 2 stability?
Yes, it supports Stratum 2 stability in holdover mode.
- What is the purpose of the programmable digital loop filter in the AD9547BCPZ-REEL7?
The programmable digital loop filter covers loop bandwidths from 0.001 Hz to 100 kHz.
- How many reference input pins does the AD9547BCPZ-REEL7 have?
The device has 2 pairs of reference input pins, each pair configurable as a single differential input or as 2 independent single-ended inputs.
- What is the role of the on-chip EEPROM in the AD9547BCPZ-REEL7?
The on-chip EEPROM stores multiple power-up profiles.
- What interface does the AD9547BCPZ-REEL7 use for configuration?
The device uses an I2C interface for configuration.
- What are some common applications of the AD9547BCPZ-REEL7?
Common applications include network synchronization, SONET/SDH clocks, wireless base stations, and cable infrastructure.
