MAX5556 Maxim Integrated Products, MAX5556 Datasheet - Page 8

• Manufacturer Part Number: MAX5556
• Description: Low-Cost Stereo Audio DAC
• Manufacturer: Maxim Integrated Products

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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
Low-Cost Stereo Audio DAC
Figure 2. Functional Diagram
Figure 3. Load-Impedance Operating Region
8
_______________________________________________________________________________________
SDATA
SCLK
LRCLK
MCLK
Integrated Analog Lowpass Filter
MAX5556
INTERFACE
SERIAL
125
100
75
50
25
INTERPOLATOR
INTERPOLATOR
S
.
3
5
LOAD RESISTANCE R
V
DD
SIGMA-DELTA
SIGMA-DELTA
MODULATOR
MODULATOR
10
L
(kΩ)
GND
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).
SAFE OPERATING REGION
15
REFERENCE
INTERNAL
DAC
DAC
Integrated Analog Output Buffer
20
LOWPASS
LOWPASS
ANALOG
ANALOG
FILTER
FILTER
25
BUFFER
BUFFER
OUTL
OUTR