DLPS030E December 2013 – March 2019 DLPC2607
Refer to the PDF data sheet for device specific package drawings
The device requires an external reference clock to feed its internal PLL. This reference may be supplied by a crystal or oscillator. For flexibility, the DLPC2607 device accepts either of two reference clock frequencies (see Table 5), but both must have a maximum frequency variation of 200 ppm (including aging, temperature, and trim component variation). When a crystal is used, the configuration requires several discrete components, as shown in Figure 11.
|PLL_REFCLK_I TO GND capacitance||4.5||pF|
|PLL_REFCLK_O TO GND capacitance||4.5||pF|
|Crystal circuit configuration||Parallel resonant|
|Crystal type||Fundamental (first harmonic)|
|Crystal nominal frequency (See TSTPT_6 in the Pin Functions table)||16.667 or 8.333||MHz|
|Crystal frequency tolerance (including accuracy, temperature, aging, and trim sensitivity)||±200||PPM|
|Crystal drive level||100 max||µW|
|Crystal equivalent series resistance (ESR)||80 max||Ω|
|RS drive resistor (nominal)||100||Ω|
|RFB feedback resistor (nominal)||1||MΩ|
|CL1 external crystal load capacitor||See Figure 11||pF|
|CL2 external crystal load capacitor||See Figure 11||pF|
|PCB layout||TI recommends a ground isolation ring around the crystal|
If an external oscillator is used, then the oscillator output must drive the PLL_REFCLK_I pin on the DLPC2607 ASIC. Leave the PLL_REFCLK_O pins unconnected. An oscillator that provides a spread-spectrum clock reduces EMI.
Similar to the crystal option, the oscillator input frequency is limited to 16.667 or 8.333 MHz. To configure the DLPC2607 device to accept the 8.333-MHz reference clock option, an external pullup resistor to VCC18 must be applied to the TSTPT (6) pin. To configure the DLPC2607 device to accept the 16.667-MHz reference clock option, leave the TSTPT (6) pin unconnected.
It is assumed that the external crystal or oscillator stabilizes within 50 ms after stable power is applied.