LM4949 datasheet(34/40 Pages) NSC

Part #	LM4949

Description	Stereo Class D Audio Subsystem with OCL Headphone Amplifier

PDF	40 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Application Information (Continued)

Single-Ended Input

The left and right stereo inputs of the LM4949 can be con-

figured for single-ended sources (Figure 6). In single-ended

input mode, the LM4949 can accept up to 4 different single-

ended audio sources. Set bits L1_INSEL = 1 and L2_INSEL

= 0 to use the RIN+ and LIN+ inputs. Set L1 _INSEL = 0 and

L2_INSEL = 1 to use the RIN- and LIN- inputs. Set

L1_INSEL = L2_INSEL = 1 to use both input pairs. Table 4

shows the single ended input combinations.

TABLE 4. Single-Ended Stereo Input Modes

INPUT MODE

L1_INSEL

L2_INSEL

INPUT DESCRIPTION

Fully Differential Input Mode

Single-ended input. RIN- and LIN- selected

Single-ended input. RIN+ and LIN+ selected

Single-ended input. RIN+ mixed with RIN- and LIN+ mixed with LIN-

202001C9

FIGURE 6. Single-Ended Input Configuration

LM4949 Datasheet(PDF) 34 Page - National Semiconductor (TI)