CDB5461 datasheet(16/27 Pages) CIRRUS

16 / 27 page

CDB5461

two channels, and 2048 samples when collect-

ing three channels.

2.9.2 Average

When doing FFT processing, this box will de-

termine the number of FFTs to average. FFTs

will be collected and averaged when the Col-

lect button is pressed.

2.9.3 FFT Window

This box allows the user to select the type of

windowing algorithm for FFT processing. Win-

dowing algorithms include the Blackman,

Blackman-Harris, Hanning, 5-term Hodie, and

7-term Hodie. The 5-term Hodie and 7-term

Hodie are windowing algorithms developed at

Crystal Semiconductor.

2.9.4 Histogram Bin Width

This box allows for a variable "bin width" when

plotting histograms of the collected data. Each

vertical bar in the histogram plot will contain

the number of output codes contained in this

box. Increasing this number may allow the

user to view histograms with larger input rang-

es.

2.9.5 Pages to Collect

This box determines the number of data "pag-

es" that the microcontroller will collect before

sending data to the PC. Each page consists of

the number of samples collected, and only the

last page will be returned to the PC for pro-

cessing. This function is useful at higher sam-

pling frequencies to minimize board-level

noise at the beginning of the conversion set.

Figure 6. Time Domain Analysis

CDB5461 Datasheet(PDF) 16 Page - Cirrus Logic