CDCE925 - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

CDCE925
Manufacturer

TI
ChipWorker Part#

CW435381933
RoHS

Lead free / RoHS Compliant
Description

Programmable 1-PLL VCXO Clock Synthesizer With 1.8V, 2.5V, and 3.3V Outputs
Documentation

Datasheet

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CDCE925 Specifications

Attribute	Attribute Value

Part Number	CDCE925
Manufacturer	TI
ChipWorker Part#	CW435381933
Documentation	Datasheet
Number of Outputs	5 Output
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RoHS	RoHS Compliant
Lead-Free Status	Lead Free

Product Description

The CDCE925 and CDCEL925 are modular PLL-based low-cost, high-performance, programmable clock synthesizers, multipliers, and dividers. They generate up to five 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 two independent configurable PLLs.
The CDCEx925 has a separate output supply pin, VDDOUT, which is 1.8 V for CDCEL925 and 2.5 V to 3.3 V for CDCE925.
The input accepts an external crystal or LVCMOS clock signal. In case of a crystal input, 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 27-MHz reference input frequency, for example.
All PLLs support SSC (spread-spectrum clocking). SSC can be center-spread or down-spread clocking, which is a common technique to reduce electromagnetic 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 nonvolatile EEPROM programming for easy customization of the device in the application. It is preset to a factory default configuration and can be reprogrammed to a different application configuration before it goes onto the PCB or reprogrammed by in-system programming. All device settings are programmable through the SDA/SCL bus, a 2-wire serial interface.
Three, free programmable control inputs, S0, S1, and S2, can be used to select different frequencies, or change the SSC setting for lowering EMI, or other control features like outputs disable to low, outputs in high-impedance state, power down, PLL bypass, and so forth.
The CDCx925 operates in a 1.8-V environment and in a temperature range of –40°C to 85°C.
Member of Programmable Clock Generator Family
CDCEx913: 1-PLL, 3 Outputs
_CDCEx925: 2-PLL, 5 Outputs_
CDCEx925: 3-PLL, 7 Outputs
CDCEx949: 4-PLL, 9 Outputs
In-System Programmability and EEPROM
Serial Programmable Volatile Register
Nonvolatile EEPROM to Store Customer Settings
Flexible Input Clocking Concept
External Crystal: 8 MHz to 32 MHz
On-Chip VCXO: Pull Range ±150 ppm
Single-Ended LVCMOS Up to 160 MHz
Free Selectable Output Frequency Up to 230 MHz
Low-Noise PLL Core
PLL Loop Filter Components Integrated
Low Period Jitter (Typical 60 ps)
Separate Output Supply Pins
CDCE925: 3.3 V and 2.5 V
CDCEL925: 1.8 V
Flexible Clock Driver
Three User-Definable Control Inputs [S0/S1/S2], for Example, SSC Selection, Frequency Switching, Output Enable, or Power Down
Generates Highly Accurate Clocks for Video, Audio, USB, IEEE1394, RFID, Bluetooth®, WLAN, Ethernet™, and GPS
Generates Common Clock Frequencies Used With TI-DaVinci™, OMAP™, DSPs
Programmable SSC Modulation
Enables 0-PPM Clock Generation
1.8-V Device Power Supply
Wide Temperature Range: –40°C to 85°C
Packaged in TSSOP
Development and Programming Kit for Easy PLL Design and Programming (TI Pro-Clock™)
APPLICATIONS
D-TVs, STBs, IP-STBs, DVD Players, DVD Recorders, and Printers
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