Texas Instruments TMS320DM355 Manual de usuario descargar pdf (Pagina 125)

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PRODUCT PREVIEW

DIN<9:0>

MSB

LSB

DACDigitalInput

ExampleforExternalCircuit

Iout[mA]

1.4mA

DACOutputCurrent

0.1 Fm

VREF

ideoDAC

BIAS

2550W

IBIAS

RLOAD

499W

IOUT

Buffer

VFB TVOUT

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463A – SEPTEMBER 2007 – REVISED SEPTEMBER 2007

A. Connect IOUT to a high-impedance video buffer device.

B. Place capacitors and resistors as close as possible to the DM355.

C. Configure the VDAC_CONFIG register in the system control module as follows: DINV = 0, PWD_GBZ = 1,

PWD_VBUFZ = 0, ACCUP_EN = X. See theTMS320DM355 ARM Subsystem Reference Guide and the

TMS320DM355 DMSoC Video Processing Back End (VPBE) User’s Guide for more information on VDAC_CONFIG.

Figure 5-31. DAC Only Application Example

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Texas Instruments TMS320DM355 Manual de usuario Pagina 125