Electronic Components Datasheet Search |
|
CDCE937 Datasheet(PDF) 2 Page - Texas Instruments |
|
CDCE937 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 30 page CDCE937 CDCEL937 SLAS564F – AUGUST 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 CDCE937 and CDCEL937 are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate up to 7 output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency up to 230 MHz, using up to three independent configurable PLLs. The CDCx937 has separate output supply pins, VDDOUT, which is 1.8 V for CDCEL937 and to 2.5 V to 3.3 V for CDCE937. 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 a reference input frequency such as 27 MHz. All PLLs 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 of each PLL. The device supports non-volatile EEPROM programming for ease-customized application. It is preset to a factory default configuration (see the Default Device Configuration section). It can be reprogrammed to a different application configuration before PCB assembly, or reprogrammed 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 control various aspects of operation including frequency selection changing the SSC parameters to lower EMI, PLL bypass, power down, and choosing between low level or 3-state for output-disable function. The CDCx937 operates in 1.8 V environment. It is characterized for operation from –40°C to 85°C. Terminal Functions for CDCE937, CDCEL937 NAME PIN TSSOP24 TYPE DESCRIPTION Y1, Y2, ... 17, 15, 14, 7, O LVCMOS outputs Y7 8, 12, 11 Xin/CLK 1 I Crystal Oscillator Input or LVCMOS Clock Input (selectable via SDA/SCL bus) Xout 20 O Crystal Oscillator Output (leave open or pull-up (~500k) when not used) VCtrl 4 I VCXO Control Voltage (leave open or pull-up (~500k) when not used) VDD 3 Power 1.8V Power Supply for the device CDCEL937: 1.8V Supply for all Outputs Vddout 6, 10, 13 Power CDCE937: 3.3V or 2.5V Supply for all Outputs GND 5, 9, 16 Ground Ground S0 2 I User Programmable Control Input S0; LVCMOS inputs; Internal Pull-up 500k SDA: Bi-Directional Serial Data Input/Output (default configuration). LVCMOS; Internal Pull-up SDA/S1 19 I/O or I 500k; or S1: User Programmable Control Input; LVCMOS inputs; Internal Pull-up 500k SCL: Serial Clock Input(default configuration), LVCMOS; Internal Pull-up 500k; or SCL/S2 18 I S2: User Programmable Control Input; LVCMOS inputs; Internal Pull-up 500k 2 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): CDCE937 CDCEL937 |
Similar Part No. - CDCE937_10 |
|
Similar Description - CDCE937_10 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |