CDCEL937
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CDCEL937

Product Category: IC Chips
Manufacturer: TI
Description:
  datasheetCDCEL937 Datasheet
Package: SSOP-20
Quantity: 76 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
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Manufacturer: TI
Product Category: IC Chips
Features, Applications

Programmable 3-PLL VCXO Clock Synthesizer With 1.8-V, 2.5-V and 3.3-V LVCMOS Outputs

FEATURES

Member of Programmable Clock Generator Family 1-PLL, 3 Outputs 2-PLL, 5 Outputs 3-PLL, 7 Outputs 4-PLL, 9 Outputs In-System Programmability and EEPROM - Serial Programmable Volatile Register - Nonvolatile EEPROM to Store Customer Setting Flexible Input Clocking Concept - External Crystal: 8 MHz to 32 MHz - On-Chip VCXO: Pull Range ±150 ppm - Single-Ended LVCMOS to 160 MHz Selectable Output Frequency to 230 MHz Low-Noise PLL Core - Integrated PLL Loop Filter Components - Low Period Jitter (Typ 60 ps)


Flexible Clock Driver - Three User-Definable Control Inputs [S0/S1/S2] e.g., SSC Selection, Frequency Switching, Output Enable or Power Down - Programmable SSC Modulation - Enables 0-PPM Clock Generation - Generates Common Clock Frequencies Used With TI-DaVinciTM, OMAPTM, DSPs - Generates Highly Accurate Clocks for Video, Audio, USB, IEEE1394, RFID, BluetoothTM, WLAN, EthernetTM, and GPS 1.8-V Device Power Supply Separate Output Supply Pins 3.3 V and 1.8 V Wide Temperature Range to 85°C Packaged in TSSOP Development and Programming Kit for Easy PLL Design and Programming (TI Pro-ClockTM)


APPLICATIONS

D-TV, HD-TV, STB, IP-STB, DVD-Player, DVD-Recorder, Printer

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. DaVinci, OMAP, Pro-Clock are trademarks of Texas Instruments. Bluetooth is a trademark of Bluetooth SIG. Ethernet is a trademark of Xerox Corporattion.


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.


These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.


DESCRIPTION

The CDCE937 and CDCEL937 are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate to 7 output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency to 230 MHz, using up to three independent configurable PLLs. The CDCx937 has separate output supply pins, VDDOUT, which 1.8 V for CDCEL937 and 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 to 20 pF. Additionally, an on-chip VCXO is selectable which allows synchronization of the output frequency to an external control signal, i.e. 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 1.8 V environment. It is characterized for operation from to 85°C. Terminal Functions for CDCE937, CDCEL937


NAME Y2,... Y7 Xin/CLK Xout VCtrl VDD Vddout GND SDA/S1 SCL/S2 PIN TSSOP24 TYPE Power Ground I I/O or I LVCMOS outputs Crystal Oscillator Input or LVCMOS Clock Input (selectable via SDA/SCL bus) Crystal Oscillator Output (leave open or pull-up (~500k) when not used) VCXO Control Voltage (leave open or pull-up (~500k) when not used) 1.8V Power Supply for the device CDCEL937: 1.8V Supply for all Outputs or 2.5V Supply for all Outputs Ground User Programmable Control Input S0; LVCMOS inputs; Internal Pull-up 500k SDA: Bi-Directional Serial Data Input/Output (default configuration). LVCMOS; Internal Pull-up or S1: User Programmable Control Input; LVCMOS inputs; Internal Pull-up 500k SCL: Serial Clock Input(default configuration), LVCMOS; Internal Pull-up or S2: User Programmable Control Input; LVCMOS inputs; Internal Pull-up 500k DESCRIPTION


Submit Documentation Feedback Product Folder Link(s): CDCE937 CDCEL937

XO LVCMOS Xout EEPROM S1/SDA S2/SCL Programming and SDA/SCL Register

over operating free-air temperature range (unless otherwise noted) (1)

VALUE VDD II IO Tstg (1) (2) Supply voltage range Input voltage range (2) Output voltage range (2) Input current (VI VI > VDD) Continuous output current Storage temperature range Maximum junction temperature -0.5 to VDD -0.5 to Vddout 150 125 UNIT mA °C


Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The input and output negative voltage ratings may be exceeded if the input and output clamp-current ratings are observed.


PACKAGE THERMAL RESISTANCE for TSSOP (PW) PACKAGE (1)

over operating free-air temperature range (unless otherwise noted)

PARAMETER AIRFLOW (lfm) 0 TJA Thermal resistance junction-to-ambient 250 500 TJC (1) Thermal resistance junction-to-case - TSSOP20 °C/W


The package thermal impedance is calculated in accordance with JESD 51 and JEDEC2S2P (high-k board). Submit Documentation Feedback Product Folder Link(s): CDCEL937 3

Search Part number : "CDCEL" Included word is 10
Part Number Manufacturer Package Quantity Description
CDCEL937PW Texas Instruments 20-TSSOP (0.173", 4.40mm Width) 116 IC 3-PLL VCXO CLK SYNTH 20-TSSOP
CDCEL937PWG4 Texas Instruments 20-TSSOP (0.173", 4.40mm Width) 69 IC 3-PLL VCXO CLK SYNTH 20-TSSOP
CDCEL937PWR Texas Instruments 20-TSSOP (0.173", 4.40mm Width) 13674 IC 3-PLL VCXO CLK SYNTH 20-TSSOP
CDCEL937QPWRQ1 Texas Instruments 20-TSSOP (0.173", 4.40mm Width) 784 IC 3-PLL VCXO LVCMOS 20TSSOP
CDCEL949PWG4 Texas Instruments 24-TSSOP (0.173", 4.40mm Width) 89 IC 4-PLL VCXO CLK SYNTH 24-TSSOP
CDCEL949PWR Texas Instruments 24-TSSOP (0.173", 4.40mm Width) 3575 IC 4-PLL VCXO CLK SYNTH 24-TSSOP
CDCEL913PW Texas Instruments 14-TSSOP (0.173", 4.40mm Width) 6086 IC 1-PLL VCXO CLK SYNTH 14-TSSOP
CDCEL913PWR Texas Instruments 14-TSSOP (0.173", 4.40mm Width) 6285 IC 1-PLL VCXO CLK SYNTH 14-TSSOP
CDCEL925PW Texas Instruments 16-TSSOP (0.173", 4.40mm Width) 507 IC 2PLL VCXO CLK SYNTH 16-TSSOP
CDCEL925PWR Texas Instruments TSSOP16 7082 IC 2PLL VCXO CLK SYNTH 16-TSSOP
CDCEL937 RELATED PRODUCT PICTURE
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