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CDCM6208V1FRGZR Datasheet(PDF) 54 Page - Texas Instruments |
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CDCM6208V1FRGZR Datasheet(HTML) 54 Page - Texas Instruments |
54 / 87 page ![]() CDCM6208V1F SCAS943 – MAY 2015 www.ti.com Typical Applications (continued) 11.2.1.1 Device Block-level Description The CDCM6208V1F includes an on-chip PLL with an on-chip VCO. The PLL blocks consist of a universal input interface, a phase frequency detector (PFD), charge pump, partially integrated loop filter, and a feedback divider. Completing the CDCM6208V1F device are the combination of integer and fractional output dividers, and universal output buffers. The PLL is powered by on-chip low dropout (LDO), linear voltage regulators and the regulated supply network is partitioned such that the sensitive analog supplies are running from separate LDOs than the digital supplies which use their own LDO. The LDOs provide isolation of the PLL from any noise in the external power supply rail with a PSNR of better than -50 dB at all frequencies. The regulator capacitor pin REG_CAP should be connected to ground by a 10 µF capacitor with low ESR (e.g. below 1 Ω ESR) to ensure stability. 11.2.1.2 Device Configuration Control Figure 40 illustrates the relationships between device states, the control pins, device initialization and configuration, and device operational modes. In pin mode, the state of the control pins determines the configuration of the device for all device states. In programming mode, the device registers are initialized to their default state and the host can update the configuration by writing to the device registers. A system may transition a device from pin mode to host connected mode by changing the state of the SI_MODE pins and then triggering a device reset (either via the RESETN pin or via setting the RESETN bit in the device registers). In reset, the device disables the outputs so that unwanted sporadic activity associated with device initialization does not appear on the device outputs. 54 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: CDCM6208V1F |
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