CDB5513 datasheet(5/22 Pages) CIRRUS

5 / 22 page

CDB5510/11/12/13

DS337DB2

DIP switches on the CDB5510 should be set to the

“CS5511/13 Internally Clocked” section of Table

1.6 PC Interface

The evaluation system comes with software and an

RS-232 cable to link the evaluation board to the

PC. The executable software was developed with

LabWindows/CVI and meant to run under Win-

dows 95 or 98. After installing the software, read

the readme.txt file for any last minute changes in

the software. Additionally, Section 2.0: Software

in this document further details how to install and

use the software.

1.7 Adding an Amplifier to the CDB5510

The CDB5510 is laid out so that a standard 8-pin

SOIC dual op-amp of the user’s choosing can be in-

stalled on the board to allow evaluation of the

CS5510/11/12/13’s performance with an op-amp

front-end. If an op-amp front-end is desired, the ad-

ditional components such as feedback resistors and

bypass capacitors must also be installed on the

board. A schematic of the amplifier section includ-

ing some typical component values is shown in

Figure 9. The amplifier is configured to operate in

either a single non-inverting, or a dual differential

configuration. The mode of operation can be select-

ed by changing the jumper on HDR2. Using the

components shown in Figure 9, the gain of the am-

plifier will be 10 in the single configuration, or 21

in the dual configuration. Different gain values can

be achieved by changing the value of resistors R6,

R17, and R18.

1.8 Interfacing to an External Controller

The ADC serial interface is SPI and MICROW-

IRETM compatible. The interface control lines (CS,

SDO, and SCLK) are connected to the 8515 micro-

controller on the CDB5510. The ADCs can be in-

terfaced to an external microcontroller through

HDR6onthe CDB5510. To accomplish this,the

CDB5510 board must be modified in one of three

ways: 1) remove the microcontroller from its sock-

et, 2) remove resistors R20-R22, or 3) cut the inter-

face control traces between the microcontroller and

the header.

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