Rainbow-electronics MAX5559 Manual de usuario descargar pdf (Pagina 8)

MAX5556–MAX5559

Low-Cost Stereo Audio DACs

8 ________________________________________________________________________________________

Integrated Analog Lowpass Filter

The DAC output of the sigma-delta modulator is fol-

lowed by an analog smoothing filter that attenuates

high-frequency quantization noise. The corner frequen-

cy of the filter is approximately 2 x f

Integrated Analog Output Buffer

Following the analog lowpass filter, the analog signal is

routed through internal buffers to OUTR and OUTL. The

buffer can directly drive load resistances larger than

3kΩ and load capacitances up to 100pF (Figure 3).

INTERPOLATOR

SIGMA-DELTA

MODULATOR

SIGMA-DELTA

MODULATOR

ANALOG

LOWPASS

FILTER

ANALOG

LOWPASS

FILTER

SDATA

MCLK

LRCLK

SCLK

OUTL

OUTR

GND

DAC

BUFFER

INTERNAL

REFERENCE

INTERPOLATOR

BUFFER

MAX5556–MAX5559

SERIAL

INTERFACE

LOAD RESISTANCE R

(kΩ)

5101520

125

100

SAFE OPERATING REGION

LOAD CAPACITANCE C

(pF)

Figure 2. Functional Diagram

Figure 3. Load-Impedance Operating Region

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 18 19

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Rainbow-electronics MAX5559 Manual de usuario Pagina 8

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