AM3703CUS datasheet(147/280 Pages) TI

147 / 280 page

swps038-125

= External pin

VREF

TVDET

TVBUF

–

I DAC

AVDAC

vssa_dac

vdda_dac

cvideo1_out

cvideo1_vfb

cvideo1_rset

SET

LOAD

OUT

AM3715, AM3703

www.ti.com

SPRS616F

– JUNE 2010 – REVISED AUGUST 2011

Video DAC Specifications

NOTE

For more information regarding the VideoDAC architecture, see the Display Subsystem /

Display Subsystem Functional Description / Video Encoder Functionalities / Video DAC

Stage

—Architecture and Control section of AM/DM37x Technical Reference Manual

(literature number SPRUGN4).

5.1

TVOUT Buffer Mode (DAC + Buffer)

NOTE

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 TVOUT Buffer path is bypassed.

The connection for this TVOUT buffer mode (DAC + Buffer) normal mode of operation is shown in

Figure 5-1. The default mode of operation is dc coupling. For more information regarding the

recommended values of the external components, see Section 5.4, Electrical Specifications Over

Recommended Operating Conditions.

Figure 5-1. Recommended Loading Conditions for TVOUT Buffer Mode(1)

(1) In single-channel configuration only channel-1 is used.

Video DAC Specifications

147

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