Overview
The AD9523-1, produced by Analog Devices Inc., is a low power, multi-output clock generator designed to provide low jitter performance. It features an on-chip PLL and VCO with two VCO dividers, allowing the VCO to tune from 2.94 GHz to 3.1 GHz. This device is particularly suited for supporting the clock requirements in long term evolution (LTE) and multicarrier GSM base station designs. It relies on an external VCXO for reference jitter cleanup to achieve stringent low phase noise requirements necessary for optimal data converter SNR performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage | 3.3 | V | |||
| Maximum Output Frequency (LVDS) | 1 GHz | ||||
| Maximum Output Frequency (CMOS) | 250 MHz | 15 pF load | |||
| Rise Time/Fall Time (20% to 80%) - LVDS | 138 ps | 161 ps | 100 Ω termination across output pair | ||
| Rise Time/Fall Time (20% to 80%) - CMOS | 387 ps | 665 ps | 15 pF load | ||
| Duty Cycle - LVDS | 48% | 51% | 53% | % | f < 500 MHz |
| Power Dissipation (Typical Configuration) | 898 mW | 984.7 mW | mW | Clock distribution outputs running as specified | |
| Output Jitter (RMS) - LVPECL/LVDS/HSTL | 109 fs | fs | f = 122.88 MHz | ||
| Package Type | 72-Lead Lead Frame Chip Scale Package (LFCSP) |
Key Features
- Low power consumption with typical power dissipation of 898 mW to 984.7 mW in typical configuration.
- Multi-output clock distribution with 14 low noise outputs ranging from 1 MHz to 1 GHz and one dedicated buffered output from the input PLL (PLL1).
- On-chip PLL and VCO with two VCO dividers, allowing VCO tuning from 2.94 GHz to 3.1 GHz.
- Support for both single-ended and differential operation through input receivers, oscillator, and zero delay receiver.
- In-package EEPROM programmable through a serial interface to store user-defined register settings for power-up and chip reset.
- Low jitter performance with RMS jitter as low as 109 fs for LVPECL, LVDS, and HSTL modes.
Applications
- Long Term Evolution (LTE) base station designs
- Multicarrier GSM base station designs
- Wireless infrastructure
- Instrumentation and networking applications requiring high clock precision
- Broadband and Automatic Test Equipment (ATE) applications demanding predictable clock performance.
Q & A
- What is the primary function of the AD9523-1?
The AD9523-1 is a low power, multi-output clock generator designed to provide low jitter performance for various clock distribution applications.
- What is the frequency range of the VCO in the AD9523-1?
The VCO in the AD9523-1 tunes from 2.94 GHz to 3.1 GHz.
- What types of output signals does the AD9523-1 support?
The AD9523-1 supports LVPECL, LVDS, HSTL, and LVCMOS output signals.
- What is the maximum output frequency for LVDS and CMOS modes?
The maximum output frequency for LVDS is 1 GHz, and for CMOS it is 250 MHz.
- How many low noise outputs does the AD9523-1 provide?
The AD9523-1 provides 14 low noise outputs along with one dedicated buffered output from the input PLL (PLL1).
- What is the purpose of the external VCXO in the AD9523-1?
The external VCXO is used for reference jitter cleanup to achieve the necessary low phase noise requirements for optimal data converter SNR performance.
- What is the typical power dissipation of the AD9523-1 in a typical configuration?
The typical power dissipation is between 898 mW and 984.7 mW.
- What package type is the AD9523-1 available in?
The AD9523-1 is available in a 72-Lead Lead Frame Chip Scale Package (LFCSP).
- Can the AD9523-1 be programmed for user-defined settings?
Yes, the AD9523-1 has an in-package EEPROM that can be programmed through a serial interface to store user-defined register settings.
- What are some common applications of the AD9523-1?
Common applications include LTE and multicarrier GSM base station designs, wireless infrastructure, instrumentation, and networking applications.
