AD7705 Analog Devices, AD7705 Datasheet - Page 40
AD7705
Manufacturer Part Number
AD7705
Description
3V/5V, 1 mW, 2-Channel Differential, 16-Bit Sigma-Delta ADC
Manufacturer
Analog Devices
Datasheet
1.AD7705.pdf
(44 pages)
Specifications of AD7705
Resolution (bits)
16bit
# Chan
2
Sample Rate
n/a
Interface
Ser,SPI
Analog Input Type
Diff-Bip,Diff-Uni
Ain Range
Bip (Vref)/(PGA Gain),Uni (Vref)/(PGA Gain)
Adc Architecture
Sigma-Delta
Pkg Type
DIP,SOIC,SOP
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AD7705/AD7706
SMART TRANSMITTERS
Another application where the low power, single-supply, 3-wire
interface capabilities of the AD7705/AD7706 are beneficial is in
smart transmitters. Figure 28 shows a block diagram of a smart
transmitter using the AD7705. Because a smart transmitter
must operate from a 4 to 20 mA loop, tolerances in the loop
SENSORS
RTD
mV
TC
Ω
V
DD
AD7705
GND
ISOLATED GROUND
REF IN
ISOLATED SUPPLY
MCLK OUT
MCLK IN
4.7μF
100kΩ
ISOLATION
Figure 28. Smart Transmitter Using the AD7705
BARRIER
Rev. C | Page 40 of 44
MICROCONTROLLER UNIT
•PID
•RANGE SETTING
•CALIBRATION
•LINEARIZATION
•OUTPUT CONTROL
•SERIAL COMMUNICATION
•HART PROTOCOL
V
CC
COM
MAIN TRANSMITTER ASSEMBLY
mean that the current available to power the transmitter can be
as low as 3.5 mA. The AD7705 consumes only 320 μA, leaving
at least 3 mA available for the rest of the transmitter. The
AD7705, with its dual-input channel, is ideally suited for
systems requiring an auxiliary channel whose measured
variable is used to correct that of the primary channel.
4.7μF
0.01μF
V
REF OUT1
REF OUT2
REF IN
C1 C2 C3
CC
0.01μF
2.2μF
AD421
0.1μF
0.0033μF
BOOST
COMP
DRIVE
LOOP
COM
RTN
DN25D
1000pF
0.01μF
1kΩ
4mA
TO
20mA