參數(shù)資料
型號： TMS320DM355_07
廠商： Texas Instruments, Inc.
英文描述： Digital Media System-on-Chip (DMSoC)
中文描述： 數(shù)字媒體系統(tǒng)芯片（DMSoC）
文件頁數(shù)： 126/158頁
文件大?。?/td> 1319K
代理商： TMS320DM355_07
www.ti.com
P
DIN <9:0>
DAC Digital Input
C
BG
0.1 F
m
VREF
Video DAC and Buffer
R
BIAS
2550
IBIAS
R
fb
= 1000
IOUT
VFB
TVOUT
R
out
= 1070
TV monitor
TVOUT [V]
Video Buffer Output Voltage
MSB
LSB
V
OL(VIDBUF)
V
OH(VIDBUF)
0
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
A.
B.
Place capacitors and resistors as close as possible to the DM355.
You must use the circuit shown in this diagram. Also you must configure the VDAC_CONFIG register in the System
Control module as follows: TRESB4R4 = 0x3, TRESB4R2 = 0x8, TRESB4R1 = 0x8, TRIMBITS = 0x34, PWD_BGZ =
1 (power up VREF), SPEED = 1 (faster), TVINT = don't care, PWD_VBUFZ = 1 (power up video buffer), VREFSET =
don't care, ACCUP_EN = 0 (no A/C coupling), DINV = 1 (invert). See the TMS320DM355 ARM Subsystem Reference
Guide and the TMS320DM355 DMSoC Video Processing Back End (VPBE) User's Guide for more information on the
VDAC_CONFIG register and Video Buffer.
For proper TVOUT voltage, you must connect the pin TVOUT directly to the TV. No A/C coupling capacitor or
termination resistor is necessary on your DM355 board. Also, it is assumed that the TV has no internal A/C coupling
capacitor but does have an internal termination resistor, as shown in this diagram. TVOUT voltage will range from
V
OL(VIDBUF)
to V
OH(VIDBUF)
. See
Section 4.3
for the voltage specifications.
C.
Figure 5-32. DAC With Buffer Circuit
126
DM355 Peripheral Information and Electrical Specifications
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