CS3310 datasheet(9/18 Pages) CIRRUS

9 / 18 page

CS3310

DS82PP3

the analog ground leads to the device to prevent

any change in the defined attenuation settings. Ex-

tensive use of ground plane fill on both the analog

and digital sections of the circuit board will yield

large reductions in radiated noise effects.

Performance Plots

Figure 8 displays the CS3310 frequency response

with a 3.75 Vp output.

Figure 9 shows the frequency response with

a.375 Vp output.

Figure 6 is the Total Harmonic Distortion + Noise

vs. amplitude at 1 kHz. The upper trace is the

THD+N vs. amplitude of the CS3310 The lower

trace is the THD+N of the Audio Precision System

One generator output connected directly to the an-

alyzer input. The System One panel settings are

identical to the previous test. This indicates that the

THD+N contribution of the Audio Precision actu-

ally degrades the measured performance of the

CS3310 below 2.7 Vrms signal levels.

Figure 7 is a 16k FFT plot demonstrating the

crosstalk performance of the CS3310 at 20 kHz.

Both channels were set to unity gain. The right

channel input is grounded with the left channel

driven to 2.65 Vrms output at 20 kHz. The FFT plot

is of the right channel output. This indicates chan-

nel to channel crosstalk of -130 dB at 20 kHz.

Figure 10 is a series of plots which display the uni-

ty-gain THD+N vs. Frequency for 600

Ω, 2 kΩ and

infinite load conditions. The output was set to

2 Vrms. The Audio Precision System One was

bandlimited to 22 kHz

Figure 11 is a series of plots which display the uni-

ty-gain THD+N vs. Frequency for 1, 2 and 2.8

Vrms output levels. The output load was open cir-

cuit. The Audio Precision System One was band-

limited to 22 kHz.

Digital Ground Plane

CPU & Digital

Logic

> 1/8"

Analog Signals

and Circuits

Analog Ground Plane

Ω

µ F

VA+

VA-

µ F

0.1

µ F

0.1

µ F

0.1

µ F

Figure 5. Recommended 2-Layer PCB Layout

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