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參數資料
型號: AD7708BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 8-/10-Channel, Low Voltage, Low Power, ADCs
中文描述: 10-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: PLASTIC, TSSOP-28
文件頁數: 36/44頁
文件大?。?/td> 339K
代理商: AD7708BRU
REV. 0
–36–
AD7708/AD7718
AD7708/AD7718-to-ADSP-2103/ADSP-2105 Interface
Figure 21 shows an interface between the AD7708/AD7718 and
the ADSP-2103/ADSP-2105 DSP processor. In the interface
shown, the RDY bit of the Status Register is again monitored to
determine when the Data Register is updated. The alternative
scheme is to use an interrupt-driven system, in which case the
RDY
output is connected to the IRQ2 input of the ADSP-2103/
ADSP-2105. The serial interface of the ADSP-2103/ADSP-2105
is set up for alternate framing mode. The
RFS
and
TFS
pins of
the ADSP-2103/ADSP-2105 are configured as active low outputs
and the ADSP-2103/ADSP-2105 serial clock line, SCLK, is also
configured as an output. The
CS
for the AD7708/AD7718 is
active when either the
RFS
or
TFS
outputs from the ADSP-2103/
ADSP-2105 are active. The serial clock rate on the ADSP-
2103/ADSP-2105 should be limited to 3 MHz to ensure correct
operation with the AD7708/AD7718.
DIN
RESET
DV
DD
CS
AD7708/
AD7718
SCLK
DOUT
SCLK
DT
DR
RFS
TFS
ADSP-2103/
ADSP-2105
Figure 21. AD7708/AD7718-to-ADSP-2103/ADSP-2105
Interface
BASIC CONFIGURATION
The basic connection diagram for the AD7708/AD7718 in 10-
channel mode is shown in Figure 22. This shows both the AV
DD
and DV
DD
pins of the converters being driven from the analog
5 V supply. Some applications will have AV
DD
and DV
DD
driven
from separate supplies. AV
DD
and DV
DD
can be operated inde-
pendently of each other, allowing the device to be operated with
5 V analog supply and 3 V digital supply or vice versa. The parts
can be operated in 8- or 10-channel configurations. In 8-channel
mode the user has two reference input options. This allows the
user to operate some channels in ratiometric mode and others
in absolute measurement mode. In 10-channel mode only one
reference option is available. An AD780/REF195, precision 2.5 V
reference, provides the reference source for the part. A quartz
crystal or ceramic resonator provides the 32.768 kHz master
clock source for the part. In some cases, it will be necessary to
connect capacitors on the crystal or resonator to ensure that it
does not oscillate at overtones of its fundamental operating fre-
quency. The values of capacitors will vary, depending on the
manufacturer’s specifications.
AD780/
REF195
RECEIVE
(READ)
P1
P2
AIN6
AIN5
AIN4
AIN3
AIN2
AIN1
0.1 F
10 F
ANALOG 5V
SUPPLY
GND
V
IN
V
OUT
AGND
DGND
0.1 F
10 F
0.1 F
AV
DD
DV
DD
REF1IN(+)
REF1IN(
)
RESET
CS
DOUT
DIN
SCLK
MCLKIN
MCLKOUT
5V
CHIP
SELECT
SERIAL
DATA
(WRITE)
SERIAL
CLOCK
32kHz
CRYSTAL
ANALOG 5V
SUPPLY
AD7708/
AD7718
AIN8
AIN7
AIN9
AINCOM
AIN10
Figure 22. Basic Configuration for 10-Channel Mode
相關PDF資料
PDF描述
AD7708 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718BR 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7718BRU 8-/10-Channel, Low Voltage, Low Power, ADCs
AD7709BR 16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port
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