CDB5513 datasheet(7/22 Pages) CIRRUS

7 / 22 page

CDB5510/11/12/13

DS337DB2

option is selected, or the board will not function

properly.

CS5510/12 Clock from Microcontroller - This op-

tion tells the software that a CS5510 or CS5512 is

being used, and that the microcontroller will pro-

vide the ADC with a master clock. The microcon-

troller’s clock frequency is user-selectable from the

Setup Window. The clock frequency is limited to

integer sub-multiples of the microcontroller’s

3.6864 MHz master clock (3.6864 MHz / N). Be

sure that no jumper is installed on HDR7 of the

CDB5510 when this option is selected, to avoid

contention with the on-board oscillator.

CS5510/12 On-Board or External Clock Source -

This option tells the software that a CD5510 or

CS5512 is being used, and that the master clock

from the part will be coming from an outside

source. If the on-board 32 kHz oscillator is to be

used as the clock source, a jumper should be in-

stalled on HDR7 of the CDB5510. If a different

clock source is to be used, no jumper should be in-

stalled, and the clock source should be connected to

the pin labeled SCLK (the top pin) of HDR7 or to

the pin labeled SCLK (the lower-left pin) on

HDR6.

Oscillator Frequency: This box displays the fre-

quency of the oscillator that the ADC is running on.

When using an external clock source, the user can

type in the frequency of the clock source, and the

FFT plots will scale accordingly. When using the

microcontroller as a clock source, the user should

adjust this value until it is close to the desired fre-

quency. The value in this box will automatically be

adjusted to a frequency that the microcontroller can

provide. When using a CS5511 or CS5513, the

“Get Internal Freq.” option should be used to deter-

mine the converter’s internal oscillator frequency.

Sampling Frequency: This box displays the com-

puted sampling frequency for the specified oscilla-

tor frequency. This

number is

used

when

performing FFT analysis.

Sleep Mode: This button allows the user to put the

ADC in sleep mode. The microcontroller will set

SCLK high, and the ADC will power down accord-

ing to the data sheet specifications. If an external

clock or the on-board oscillator is used, this option

should remain off.

Get Internal Freq.: This button is only visible

when the CS5511 or CS5513 is being used. When

pressed, the microcontroller will time the conver-

sion cycle of the ADC and the PC software will

compute the sampling rate and oscillator frequency

based on the results. This button should be pressed

when using a CS5511 or CS5513 before collecting

data to ensure that any FFT plots are scaled proper-

ly.

Acquire: When this button is pressed, the microcon-

troller will begin collecting conversions from the

ADC and sending them to the PC. The PC stores the

conversions as a small sample set. From the sample

set collected, the high, the low, peak-to-peak, aver-

age, and standard deviation, are computed (the size

of the data set is set by the “Num To Average” box)

and then the display icons are updated. The most re-

cent conversion will be displayed in the Last Con-

version box in hexadecimal format. This process

continues until the STOP button is pressed, or until

another window is selected.

Num To Average: Input icon that sets the size of

the data conversion set referred to when the Ac-

quire button is pressed.

OF and OD: These two icons represent the OF and

OD flags that are part of the ADC’s output word. If

one or both of these flags are set, the appropriate

icon will light up.

Software Calibration Features: Because the

CS5510/11/12/13 have no built-in calibration fea-

tures, any calibration functionality must be imple-

mented in software. The following functions, found

in the Software Calibration Box, allow the user to

perform software-based calibrations on the ADCs.

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