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CDB5513 Fiches technique(PDF) 4 Page - Cirrus Logic

No de pièce CDB5513
Description  Evaluation Board and Software
Download  22 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CDB5513 Fiches technique(HTML) 4 Page - Cirrus Logic

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CDB5510/11/12/13
4
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
OO VREF
OO VREF
V+
LT1019
REF
OO VREF
OO VREF
OO VREF
V+
LT1019
REF
OO VREF
OO VREF
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
1
23
OPEN
XA
B
1
23
OPEN
XA
B
1
23
OPEN
XA
B
1
23
OPEN
XA
B
Table 3. DIP Switch Settings


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