DM3725 datasheet(150/268 Pages) TI

150 / 268 page

ANDARD

VIDEO

RANGE

TVOUT

10-bit

DAC code

IRE

units

Normal

mode

111

223

741

783

895

1007

1023

140

131

120

100

7.5

-20

-40

1.3 V *

Sync level

Black level

Blanking level

Peak level

White level

SWPS038-130

DM3730, DM3725

SPRS685 – AUGUST 2010

www.ti.com

Figure 5-4. Composite Video Signal Levels(1)(2)

(1) The 1.3 VPP (peak-to-peak) is referring to the output signal at cvideo1_out in the DAC + Buffer composite-video mode.

Note that the 1.3 VPP must apply to both cvideo1_out and cvideo2_out in DAC + Buffer s-video mode (dual-DAC mode configured for ac

or dc coupling).

(2) In AVDAC normal mode (DAC + Buffer), higher values of the DAC input code provided by the Video Encoder will result in lower output

voltage due to the inverting configuration of the TVOUT Buffer. See Figure 5-4 for more details on the relation between the composite

video signal levels and the DAC code values for normal mode of operation.

In AVDAC bypass mode (DAC only), higher values of the DAC input code will result in higher output voltage, as the TVOUTBuffer path

is bypassed.

5.5

TVOUT Bypass Mode Specifications (DAC-Only) Electrical Specifications Over

Recommended Operating Conditions

NOTE

The electrical characteristics for single- and dual-channel bypass modes are the same

except that the active current will double in the dual-channel configuration.

•

Bypass Mode

–

RLOAD = 1.5 kΩ (±1%)

–

RSET = 10 kΩ (±1%)

150

Video DAC Specifications

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