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參數資料
型號: AD7714ARS-5
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 3 V/5 V, CMOS, 500 uA Signal Conditioning ADC
中文描述: 5-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: SSOP-28
文件頁數: 34/40頁
文件大小: 306K
代理商: AD7714ARS-5
AD7714
REV. C
–34–
arranged in a bridge network and gives a differential output
voltage between its OUT(+) and OUT(–) terminals. With rated
full-scale pressure (in this case 300 mmHg) on the transducer,
the differential output voltage is 3 mV/Volt of the input voltage
(i.e., the voltage between its IN(+) and IN(–) terminals).
Assuming a 5 V excitation voltage, the full-scale output range
from the transducer is 15 mV. The excitation voltage for the
bridge is also used to generate the reference voltage for the
AD7714. Therefore, variations in the excitation voltage do not
introduce errors in the system. Choosing resistor values of
24k
and 15 k
as per the diagram give a 1.92 V reference
voltage for the AD7714 when the excitation voltage is 5V.
Using the part with a programmed gain of 128 results in the full
scale input span of the AD7714 being 15 mV which corresponds
with the output span from the transducer.
APPLICATIONS
The on-chip PGA allows the AD7714 to handle an analog input
voltage range as low as 10 mV full-scale with V
REF
= +1.25V.
The differential inputs of the part allow this analog input range
to have an absolute value anywhere between AGND and AV
DD
when the part is operated in unbuffered mode. It allows the user
to connect the transducer directly to the input of the AD7714.
The programmable gain front end on the AD7714 allows the
part to handle unipolar analog input ranges from 0 mV to
+20mV to 0 V to +2.5V and bipolar inputs of
±
20 mV to
±
2.5 V. Because the part operates from a single supply these
bipolar ranges are with respect to a biased-up differential input.
Pressure Measurement
One typical application of the AD7714 is pressure measure-
ment. Figure 12 shows the AD7714 used with a pressure trans-
ducer, the BP01 from Sensym. The pressure transducer is
CLOCK
GENERATION
OUT+
IN+
OUT–
IN–
AUTO-ZEROED
MODULATOR
CHARGE BALANCING A/D
CONVERTER
DIGITAL
FILTER
AV
DD
1
m
A
BUFFER
AV
DD
SERIAL INTERFACE
REGISTER BANK
STANDBY
SYNC
MCLK IN
MCLK OUT
1
m
A
REF IN (+)
REF IN (–)
AGND
DGND
BUFFER
DOUT
DIN
CS
SCLK
POL
DRDY
RESET
24k
V
15k
V
DV
DD
AD7714
AGND
+5V
EXCITATION VOLTAGE = +5V
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
A = 1–128
S
M
PGA
Figure 12. Pressure Measurement Using the AD7714
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