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QUICK START (USB PLUG 'N' PLAY)
An inbuilt EEPROM cuts off the need for reprogramming the CDCE(L)9xx in a certain application, but
reprogramming is still possible with a 2-wire serial interface. 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. Three, free 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 device has separate output supply pins, VDDOUT, which is 1.8 V for CDCEL9xx and to 2.5 V to 3.3 V
for CDCE9xx.
The following is an overview of the devices of the CDCE(L)9xx family:
•
CDCE949/CDCEL949: 4-PLL, 9 outputs, fmax = 230 MHz, industrial temperature range, 24 pins
•
CDCE937/CDCEL937: 3-PLL, 7 outputs, fmax = 230 MHz, industrial temperature range, 20 pins
•
CDCE925/CDCEL925: 2-PLL, 5 outputs, fmax = 230 MHz, industrial temperature range, 16 pins
•
CDCE913/CDCEL913: 1-PLL, 3 outputs, fmax = 230 MHz, industrial temperature range, 14 pins
3
QUICK START (USB PLUG 'N' PLAY)
The following steps allow the user to get started quickly with the EVM.
1. Connect the EVM with the PC with a 2.0 USB cable.
2. Install the driver software using the provided CD-ROM.
3. The EVM is now running and completely powered through USB. Verify it by checking any of the
4
CDCE(L)9xx Performance Evaluation Module
Figure 3. Functional Block Diagram of the CDCE(L)9xx
Copyright © 2007–2010, Texas Instruments Incorporated
www.ti.com
SCAU022A – July 2007 – Revised July 2010
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