CDB5513 datasheet(4/22 Pages) CIRRUS

4 / 22 page

CDB5510/11/12/13

DS337DB2

ically 5ppm/°C). By setting HDR3’s jumper to the

“REF” position, the user can supply an external

voltage reference to J1’s REF input. V- is also pro-

vided at connector J1 to allow an easy connection

to the negative supply. (Application Note 4 on Cir-

rus Logic’s web site details various voltage refer-

ences).

1.5 Clocking Options

The CS5510/11/12/13 are very simple ADCs, in-

tended to continuously convert and output data

when not in sleep mode. The CS5510 and CS5512

require an external clock signal on the SCLK input

pin to run properly. The CDB5510 evaluation

board provides three options for this clock source:

1) The microcontroller can be used to generate a

clock for the CS5510/12. The microcontroller’s

clock can be selected by removing the jumper from

HDR7 on the CDB5510 board, and selecting the

“CS5510/12 Clock from microcontroller” option in

the software. The DIP switches on the evaluation

board should be set as shown in the “CS5510/12

Clock from 8515” section of Table 3. The clock

frequency can be selected by changing the “Oscil-

lator Frequency” box in the software. Note that the

frequency options are limited by the microcontrol-

ler’s counter/timer circuitry, which divides the

3.6864 MHz clock by integer values to produce the

clock output.

2) The 32 kHz on-board oscillator circuit (shown in

Figure 11) can be used by connecting HDR7 on the

CDB5510 board and selecting the “On-board or ex-

ternal clock source” option in the software. The

DIP switches on the evaluation board should be set

as shown in the “CS5510/12 External Clock” sec-

tion of Table 3.

3) An external clock can be provided by the user,

and connected to the SCLK post on HDR7. The

“On-board or external clock source” option in the

software should be selected when using an external

clock source, and the DIP switches on the evalua-

tion board should be set as shown in the

“CS5510/12 External Clock” section of Table 3.

The CS5511 and CS5513 include an internal oscil-

lator, and as such, need no external oscillator to

run. When using the CS5511 or CS5513, HDR7 on

the CDB5510 board should be left disconnected,

and the “CS5511/13 Internally Clocked” option

should be selected in the software. Likewise, the

Reference

Description

HDR3

V+

Selects Analog

Power Supply

LT1019

Selects on board

LT1019 Reference

(5ppm/

°C)

EXTERNAL

Selects external

reference source

connected to J1

Table 2. Voltage Reference Selection Using HDR3

OO VREF

V+

LT1019

REF

OO VREF

V+

LT1019

REF

OO VREF

V+

LT1019

REF

Eval Board Mode

SW1 Settings

CS5511/13 Internally Clocked

Xis OPEN

Ais OPEN

Bis OPEN

CS5510/12 Clock From 8515

Xis OPEN

Ais CLOSED

Bis CLOSED

CS5510/12 External Clock

Xis OPEN

Ais OPEN

Bis CLOSED

RS-232 Test Mode

Xis CLOSED

Ais CLOSED

Bis CLOSED

OPEN

Table 3. DIP Switch Settings

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