CS4331 datasheet(7/38 Pages) CIRRUS

7 / 38 page

GENERAL DESCRIPTION

The CS4330, CS4331, and CS4333 are complete

stereo digital-to-analog systems including digital

interpolation, 128

× third-order delta-sigma digi-

tal-to-analog conversion, digital de-emphasis and

analog filtering, Figure 2. This architecture pro-

vides a high tolerance to clock jitter.

The primary purpose of using delta-sigma modu-

lation techniques is to avoid the limitations of

laser trimmed resistive digital-to-analog con-

verter architectures by using an inherently linear

1-bit digital-to-analog converter. The advantages

of a 1-bit digital-to-analog converter include:

ideal differential linearity, no distortion mecha-

nisms due to resistor matching errors and no

linearity drift over time and temperature due to

variations in resistor values.

Digital Interpolation Filter

The digital interpolation filter increases the sam-

ple rate by a factor of 32 and is followed by a 4

digital sample-and-hold to effectively achieve a

128

× interpolation filter. This filter eliminates

images of the baseband audio signal which exist

at multiples of the input sample rate, Fs. This

allows for the selection of a less complex analog

filter based on out-of-band noise attenuation re-

quirements rather than anti-image filtering.

Following the interpolation filter, the resulting

frequency spectrum has images of the input sig-

nal at multiples of 128

× the input sample rate.

These images are removed by the external ana-

log filter.

Delta-Sigma Modulator

The interpolation filter is followed by a third-

order delta-sigma modulator which converts the

22-bit interpolation filter output into 1-bit data at

128

× .

Switched-Capacitor Filter

The

delta-sigma modulator is followed by a

digital-to-analog converter which translates the

1-bit data into a series of charge packets. The

magnitude of the charge in each packet is deter-

mined by sampling of a voltage reference onto a

switched capacitor, where the polarity of each

packet is controlled by the 1-bit signal. This

technique greatly reduces the sensitivity to clock

jitter and is a major improvement over earlier

generations of 1-bit digital-to-analog converters.

Interpolator

Delta-Sigma

Modulator

DAC

Analog

Low-Pass

Filter

Analog

Output

Digital

Input

Figure 2. System Block Diagram

CS4330, CS4331, CS4333

DS136F1

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