AD694BR Analog Devices Inc, AD694BR Datasheet - Page 12

• Manufacturer Part Number: AD694BR
• Description: 4-20mA Transceiver
• Manufacturer: Analog Devices Inc
• Type: Current Transmitterr

Specifications of AD694BR

• Amplifier Case Style: SOIC
• No. Of Pins: 16
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Package / Case: 16-SOIC
• Rohs Status: RoHS non-compliant
• Input Type: Voltage
• Output Type: Voltage
• Current - Supply: 23mA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD694
The circuit shown, will convert a positive differential signal at
V
of 3 V to 8 V. The low end of the common-mode range is limited
by the AD708’s ability to pull down on R
plifier could be used instead to extend the common-mode range
down to about 1.5 V.
IN
to a 4–20 mA current. The circuit has common-mode range
S
. A single supply am-
Figure 15. Low Cost Sensor Transmitter
–12–
As shown, the circuit handles positive differential signals (V
positive). To handle bipolar differential signals (V
or negative), the reference pin of the in amp (Point C) must be
offset positively from the 2 V reference. For example, discon-
necting Point C from the 2 V reference and connecting it to a
3 V source would result in a V
volt differential input from the sensor.
A
of 1 V (or half scale) for a zero
IN
is positive
REV. B
IN