Overview
The AD9554BCPZ-REEL from Analog Devices Inc. is a low loop bandwidth clock translator designed to provide jitter cleanup and synchronization for various systems, including synchronous optical networks (SONET/SDH), Ethernet, and Stratum applications. This device features a quad phase-locked loop (PLL) architecture, allowing it to generate output clocks synchronized to up to four external input references. The AD9554BCPZ-REEL is particularly useful in environments where input time jitter or phase noise needs to be minimized, ensuring a stable and low-jitter output clock even in the absence of reference inputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage | 1.47 | 1.89 | V | ||
| Operating Temperature | -40 | 85 | °C | ||
| Input Frequency Range | 0.002 | 1000 | MHz | Reference inputs | |
| Output Frequency Range | 430 | 941 | MHz | ||
| Input Types | CMOS, LVDS | ||||
| Output Types | HCSL, LVDS, LVPECL | ||||
| Package Type | 72-lead LFCSP (10 mm x 10 mm) | ||||
| Differential Input Voltage Sensitivity | 400 | 1200 | mV | Differential voltage across pins | |
| Differential Output Voltage Swing | 540 | 1020 | mV | Peak-to-peak differential output amplitude |
Key Features
- Quad PLL architecture with four input references and eight differential clock outputs.
- Programmable input reference switchover priority and 20-bit programmable input reference divider.
- Output frequency range from 430 kHz to 941 MHz.
- Programmable 18-bit integer and 24-bit fractional feedback divider in digital PLL.
- Programmable loop bandwidths from 0.1 Hz to 4 kHz.
- Optional off-chip EEPROM to store power-up profile.
- Reference validation and frequency monitoring with 2 ppm accuracy.
- 4x4 crosspoint allows any reference input to drive any PLL.
- Digital PLL (DPLL) and analog PLL (APLL) for jitter cleanup and phase noise reduction.
- Holdover circuitry to maintain a stable output clock in the absence of reference inputs.
Applications
- Synchronous optical networks (SONET/SDH).
- Ethernet applications requiring precise clock synchronization.
- Stratum clocking for telecommunications and networking equipment.
- Passive optical networks (PON) and base station applications.
- Multiservice line cards and other high-speed digital systems.
Q & A
- What is the primary function of the AD9554BCPZ-REEL?
The AD9554BCPZ-REEL is a low loop bandwidth clock translator that provides jitter cleanup and synchronization for various systems, including SONET/SDH and Ethernet applications.
- What types of input and output signals does the AD9554BCPZ-REEL support?
The device supports CMOS and LVDS input signals and can output HCSL, LVDS, and LVPECL signals.
- What is the operating temperature range of the AD9554BCPZ-REEL?
The operating temperature range is from -40°C to +85°C.
- What is the maximum output frequency of the AD9554BCPZ-REEL?
The maximum output frequency is 941 MHz.
- Does the AD9554BCPZ-REEL support programmable loop bandwidths?
- What is the purpose of the holdover circuitry in the AD9554BCPZ-REEL?
The holdover circuitry ensures that the device continues to generate a stable output clock even when all reference inputs have failed.
- Can the AD9554BCPZ-REEL store power-up profiles?
- What is the package type of the AD9554BCPZ-REEL?
The device is packaged in a 72-lead LFCSP (10 mm x 10 mm).
- Does the AD9554BCPZ-REEL support reference validation and frequency monitoring?
- What is the differential output voltage swing of the AD9554BCPZ-REEL?
The differential output voltage swing is between 540 mV and 1020 mV.
