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參數資料
| 型號： | CDC421XXX |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR |
| 中文描述： | 完全集成的固定頻率低抖動，晶體振蕩器時鐘發生器 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 507K |
| 代理商： | CDC421XXX |
www.ti.com
FEATURES
Single 3.3 V Supply
High-Performance Clock Generator,
Incorporating Crystal Oscillator Circuitry With
Integrated Frequency Synthesizer
Low Output Jitter, as Low as 380 fs (rms
integrated between 10 kHz–20 MHz)
Low Phase Noise at 312.5 MHz, Less Than
–120 dBc/Hz at 10 kHz and –147 dBc/Hz at 10
MHz Offset From the Carrier
Supports Crystal Frequencies or LVCMOS
Input Frequencies at 31.25 MHz, 33.33 MHz,
and 35.42 MHz
APPLICATIONS
Low-Cost, Low-Jitter Frequency Multiplier
Crystal
Oscillator
Input
External Crystal
Feedback
Divider
P
Loop Filter
VCO
P
O
L
CLK
NCLK
B0216-02
DESCRIPTION
CDC421xxx is a high-performance, low-phase-noise clock generator. It has an integrated low-noise, LC-based
voltage-controlled oscillator (VCO) that operates within the 1.75 GHz–2.35 GHz frequency range. It has an
integrated crystal oscillator that operates in conjunction with an external AT-cut crystal to produce a stable
frequency reference for the PLL-based frequency synthesizer. The output frequency (f
out
) is proportional to the
frequency of the input crystal (f
xtal
).
The device operates in a 3.3 V supply environment and is characterized for operation from –40
°
C to 85
°
C.
CDC421xxx is available in a QFN-24 package.
CDC421xxx
SLAS540–APRIL 2007
FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK
GENERATOR
Output Frequencies: 100 MHz, 106.25 MHz,
125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz,
and 312.5 MHz
Differential Low-Voltage Positive Emitter
Coupled Logic (LVPECL) Output
Fully Integrated Voltage-Controlled Oscillator
(VCO) Running from 1.75 GHz to 2.35 GHz
Typical Power Consumption 300 mW
Chip-Enable Control Pin
QFN-24 Package
ESD Protection Exceeds 2 kV HBM
Industrial Temperature Range –40
°
C to 85
°
C
A
A
A
A
A high-level block diagram of the CDC421xxx is shown in
Figure 1
.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 2007, Texas Instruments Incorporated
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