AD694AQ Analog Devices Inc, AD694AQ Datasheet - Page 12

• Manufacturer Part Number: AD694AQ
• Description: IC SGNL COND 4-20MA TX 16-CDIP
• Manufacturer: Analog Devices Inc
• Type: Current Transmitterr

Specifications of AD694AQ

• Rohs Status: RoHS non-compliant
• Input Type: Voltage
• Output Type: Voltage
• Current - Supply: 23mA
• Mounting Type: Through Hole
• Package / Case: 16-CDIP (0.300", 7.62mm)
• No. Of Amplifiers: 1
• Input Offset Voltage: 500µV
• Bandwidth: 300kHz
• Amplifier Output: Single Ended
• Cmrr: 90dB
• Supply Voltage Range: 4.5V To 36V
• Supply Current: 1.5mA
• Amplifier Case Style: DIP
• Rohs Compliant: No
• Interface: -

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