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CDCEL913PWR データシート(PDF) 2 Page - Texas Instruments

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部品番号 CDCEL913PWR
部品情報  Programmable 1-PLL VCXO Clock Synthesizer With 1.8-V, 2.5-V, and 3.3-V Outputs
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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CDCEL913PWR データシート(HTML) 2 Page - Texas Instruments

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CDCE913
CDCEL913
SCAS849E – JUNE 2007 – REVISED MARCH 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION
The CDCE913 and CDCEL913 are modular PLL-based low-cost, high-performance, programmable clock
synthesizers, multipliers, and dividers. They generate up to 3 output clocks from a single input frequency. Each
output can be programmed in-system for any clock frequency up to 230 MHz, using the integrated configurable
PLL.
The CDCx913 has separate output supply pins, VDDOUT, which is 1.8 V for CDCEL913 and 2.5 V to 3.3 V for
CDCE913.
The input accepts an external crystal or LVCMOS clock signal. If an external crystal is used, an on-chip load
capacitor is adequate for most applications. The value of the load capacitor is programmable from 0 to 20 pF.
Additionally, an on-chip VCXO is selectable which allows synchronization of the output frequency to an external
control signal, that is, PWM signal.
The deep M/N divider ratio allows the generation of zero-ppm audio/video, networking (WLAN, BlueTooth,
Ethernet, GPS) or interface (USB, IEEE1394, Memory Stick) clocks from e.g., a 27 MHz reference input
frequency.
The PLL supports SSC (spread-spectrum clocking). SSC can be center-spread or down-spread clocking which is
a common technique to reduce electro-magnetic interference (EMI).
Based on the PLL frequency and the divider settings, the internal loop filter components are automatically
adjusted to achieve high stability and optimized jitter transfer characteristic.
The device supports non-volatile EEPROM programming for ease customization of the device to the application.
It is preset to a factory default configuration (see the DEFAULT DEVICE CONFIGURATION section). It can be
re-programmed to a different application configuration before PCB assembly, or re-programmed by in-system
programming. All device settings are programmable through SDA/SCL bus, a 2-wire serial interface.
Three programmable control inputs, S0, S1 and S2, can be used to select different frequencies, or change SSC
setting for lowering EMI, or other control features like, outputs disable to low, outputs 3-state, power down, PLL
bypass etc).
The CDCx913 operates in a 1.8 V environment. It operates in a temperature range of –40° C to 85° C.
Terminal Functions for CDCE913, CDCEL913
TERMINAL
I/O
DESCRIPTION
NAME
PIN TSSOP14
Y1–Y3
11, 9, 8
O
LVCMOS outputs
Xin/CLK
1
I
Crystal oscillator input or LVCMOS clock Input (selectable via SDA/SCL bus)
Xout
14
O
Crystal oscillator output (leave open or pullup when not used)
VCtrl
4
I
VCXO control voltage (leave open or pullup when not used)
VDD
3
Power
1.8-V power supply for the device
CDCEL913: 1.8-V supply for all outputs
VDDOUT
6, 7
Power
CDCE913: 3.3-V or 2.5-V supply for all outputs
GND
5, 10
Ground
Ground
S0
2
I
User-programmable control input S0; LVCMOS inputs; internal pullup 500k
SDA: bidirectional serial data input/output (default configuration), LVCMOS internal
SDA/S1
13
I/O or I
pullup; or
S1: user-programmable control input; LVCMOS inputs; internal pullup 500k
SCL: serial clock input LVCMOS (default configuration), internal pullup 500k or
SCL/S2
12
I
S2: user-programmable control input; LVCMOS inputs; internal pullup 500k
2
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Copyright © 2007–2010, Texas Instruments Incorporated
Product Folder Link(s): CDCE913 CDCEL913


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