PCM1741ESLASH2K datasheet(17/24 Pages) TI2

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PCM1741

SBAS175

using a Multiple FeedBack (MFB) circuit arrangement that

reduces sensitivity to passive component variations over

frequency and temperature. For more information regarding

MFB active filter design, please refer to Burr-Brown Appli-

cations Bulletin #34 AB-034 (SBFA001), available from our

web site at http://www.ti.com.

Since the overall system performance is defined by the

quality of the DACs and their associated analog output

circuitry, high-quality audio op amps are recommended for

the active filters. The OPA2353 and OPA2134 dual op amps

from Texas Instruments are recommended for use with the

PCM1741, see Figures 9(a) and 10.

PCB LAYOUT GUIDELINES

A typical PCB floor plan for the PCM1741 is shown in

Figure 12. A ground plane is recommended, with the analog

and digital sections being isolated from one another using a

split or cut in the circuit board. The PCM1741 should be

oriented with the digital I/O pins facing the ground plane

split/cut to allow for short, direct connections to the digital

audio interface and control signals originating from the

digital section of the board.

PCM1741

DGND

Return Path for Digital Signals

Analog

Ground

Digital

Ground

AGND

Output

Circuits

DIGITAL SECTION

ANALOG SECTION

Digital Logic

and

Audio

Processor

Digital Power

DGND

Analog Power

+3.3V

AGND

REG

–V

FIGURE 12. Recommended PCB Layout.

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