CDCE421A - 完全集成的宽范围低抖动晶振时钟发生器

CDCE421A是TI德州仪器公司的一款低抖动（1psecRMS）产品，CDCE421A是完全集成的宽范围低抖动晶振时钟发生器，本站介绍了CDCE421A的封装应用图解、特点和优点、功能等，并给出了与CDCE421A相关的TI元器件型号供参考。

CDCE421A - 完全集成的宽范围低抖动晶振时钟发生器 - 低抖动（1psecRMS） - 时钟发生器 - 德州仪器

产品描述

The CDCE421A is a high-performance, low phase noise clock generator. It has two fully-integrated, low-noise, LC-based voltage-controlled oscillators (VCOs) that operate in the 1.750-GHz to 2.350-GHz frequency range. It also features an integrated crystal oscillator that operates in conjunction with an external AT-cut crystal to produce a stable frequency reference for the phase-locked loop (PLL) based frequency synthesizer.

The output frequency (fOUT) is proportional to the frequency of the input crystal (fXTAL). The prescaler divider, feedback divider, output divider, and VCO selection set the output frequency with respect to fXTAL.

In the CDCE421A, the feedback divider is set automatically with respect to the prescaler setting. The product of the prescaler and the feedback divider should be between 60 and 64 as shown in to maintain a stable control loop.

The CDCE421A supports one differential LVDS clock output or one differential LVPECL output. All device settings are programmable through a proprietary simple serial interface (SSI).

The device operates in 3.3-V supply environment for both LVPECL and LVDS outputs and is characterized for operation from -40°C to +85°C. The CDCE421A is available in a QFN-24 4-mm × 4-mm package.

CDCE421 Users:

The CDCE421A provides several device enhancements to the CDCE421.

产品特性

Single Supply at 3.3 V for LVPECL or LVDS Operation
High-Performance Clock Multiplier, Incorporating Crystal Oscillator Circuitry with Integrated Frequency Synthesizer
Low Output Jitter: 380 fs RMS typical (from 10 kHz to 20 MHz)
Low Phase Noise at High Frequency (708-MHz LVPECL):
- Typically -109 dBc/Hz at 10 kHz and -146dBc/Hz at 10 MHz from the carrier
Supports Crystal or LVCMOS Input Frequencies from 27.35 MHz to 38.33 MHz
Output Frequency Ranges from 10.9 MHz to 766.7 MHz and from 875.2 MHz to 1175 MHz
Low-Voltage Differential Signaling (LVDS) Output, 100- Differential Off-Chip Termination, 10.9-MHz to 400-MHz Frequency Range
Differential Low-Voltage Positive Emitter Coupled Logic (LVPECL) Outputs, 10.9-MHz to 1.175-GHz Frequency Range
Two Fully-Integrated Voltage-Controlled Oscillators (VCO) Support Wide Output Frequency Range
Fully Integrated Programmable Loop Filter
Typical Power Consumption at 3.3 V:
- 274 mW in LVDS mode
- 250 mW in LVPECL mode
Chip Enable Control Pin
Simple Serial Interface Allows Programming after Manufacturing
Integrated On-Chip Nonvolatile Memory (EEPROM) Stores Settings Without Applying High Voltage
Available in 4-mm × 4-mm QFN-24 Package
ESD Protection Exceeds 2 kV (HBM)
Industrial Temperature Range: -40°C to +85°C
APPLICATIONS
- Low-Cost, High-Frequency Crystal Oscillator

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