Oscillator IC With Electronic Calibration
The CDCE401 is designed to achieve today?s demanding challenges for crystal Oscillator modules. The small form factor of the unpackaged die or the QFN package reduces the space consumption of the device to the technical minimum level of today?s silicon technology.
The on-die trimming capacitance allows frequency trimming of the Oscillator module after the manufacturing process. Therefore, by doing a post-manufacturing programming, crystal manufacturing tolerances CAN be trimmed out.
During power up or with each enabling, the CDCE401 Oscillator start-up circuit switches off all Oscillator capacitors (CXI, CXO, CBASE) to maximize negative impedance during start-up. After a certain time (1/XTAL-frequency 217 ~ 1.311 ms-6.554 ms), the capacitances are connected to tune to the trimmed frequency range.
An on-die EEPROM enables nonvolatile storage of the frequency setting. For the transfer of the programming into the EEPROM the CDCE401 takes advantage of the SDATA input. In-circuit programming of the device is possible.
Unlike other EEPROM-based devices, it is not necessary to apply a high supply voltage to the device in order to program it.
The CDCE401 accepts crystals from 20 MHz up to 100 MHz. For lower frequencies, the CDCE401 provides a programmable post-divider.
The CDCE401 features a wide supply-voltage range. This makes the device ideal to use at today?s most commonly used supply voltage of 2.5 V, and operation at supply voltages of 2.8 V, 2.85 V, and 3 V for cellular applications CAN be addressed with a single device. Therefore, use of the device in multiple different application spaces is possible, reducing inventory costs.
The CDCE401 is characterized to work in the industrial temperature range from -40C to 85C.
Optional: QFN Package Terminal Assignment
For evaluation purposes, the CDCE401 is also available in a QFN package. The packaged device CAN be obtained together with an EVM.
By Texas Instruments
|CDCE401 Pb-Free||CDCE401 Cross Reference||CDCE401 Schematic||CDCE401 Distributor|
|CDCE401 Application Notes||CDCE401 RoHS||CDCE401 Circuits||CDCE401 footprint|