ANALOG
W DEVICES
Precision,TripleOutput
TransducerPowerSupply
FEATURES
Resistor Programmable Voltage or Current Output
Voltage: +1V dc to +15V dc @ 125mA max
Current: 100pA to 10mA (VCOMPL
=+10V)
Dual Fixed Output: :t15V dc @:t65mA max
Excellent Regulation: Line :to.01% max; Load :to.02% max
Low Drift: 0.006%fC max (2B35K)
No Derating Over -25°C to +71°C Operating Range
APPLICATIONS
Measurement and Control Instruments and Systems
Excitation Source For:
Strain Gages, Pressure Transducers, Load Cells,
Torque Transducers, RTD's
GENERAL DESCRIPTION
The 2B3 5 is a triple output modular power supply designed to
provide regulated excitation to a wide variety of transducers
as well as :t15V power for amplifiers and other analog circuits
of an instrumentation system. The single-resistor programmable
transducer excitation output may be operated in two modes:
constant voltage, providing a +1V to +15V output or a con-
stant current, adjustable from 100pA to 10mA.
The programmable output in the voltage mode features cur-
rent rating of 0 to 125mA, suitable to excite four 350n trans-
ducers at 10V. Current limiting protects the output against ac-
cidental overload and remote sensing corrects for the trans-
ducer cable resistance variations. In the constant current mode,
externally set 100pA to 10mA output offers a 0 to +lOV com-
pliance voltage range. The :t15V outputs feature 0.5% tracking
accuracy and current rating of 0 to :t65mA max.
Two accuracy selections are available offering guaranteed low
temperature coefficient; 2B35K: 0.006%/C max and 2B35J:
O.05%/C max. Line and load regulation are also guaranteed;
2B35K: 0.01% and 0.02%, and 2B35J: 0.08% and 0.1%, max,
respectively.
APPLICAtIONS
The 2B35 is designed for ac powered signal conditioning in-
strumentation applications used for data acquisition, control,
indication or recording. This compact module may be applied
as a power source for the model 2B30 strain gage transdl,lcer/
RTD signal conditioner in a high accuracy transducer interface
application. Some typical applications involve strain gages for
stress/strain measurements, pressure transducers, load cells,
torque transducers and RTD's.
Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
FINE GAIN
BRIDGE TRANSDUCER SIGNAL CONDITIONING
OPERATION
Figure 1 illustrates operation of the 2B3 5K providing an ad-
justable voltage output and dual15V dc outputs. The resistor
programmable output (+VOUT) is set between +1V to +15V
by the RTRIM. RTRIM may be determined by using either the
table shown in Figure 1 or the graph shown in Figure 2. For
example, to provide an adjustable range from +1V to +6V,
RTRIM should be a 5kn pot.
The remote sensing inputs (pins 5 and 8) are connected at the
transducer (load) to the voltage output (SENSE HIGH to
+VOUT and SENSE LOW to COMMON).
3
AEF OUT f-
AEF IN (HIGH) 4
V AC 2
PWA
COMMON
ATRIM
MODEL
2B35K
~ ,1.,5V!
~
SENSE HIGH
'25ppm!"C OR BETTER
RLOAD' ~ RLOAD'
SENSE LOW
COM.
Figure 1. Model 2835K Connection Diagram for Dual15V de
and Adjustable + 1V to + 15V Output
For optional input voltage ranges, see note 1, page 2.
P.O. Box 280; Norwood, Massachusetts 02062 U.S.A.
Tel: 617/329-4700 Twx: 710/394-6577
Telex: 924491 Cables: ANALOG NORWOODMASS
,VOUT ATRIM'
IV) '3% Ikm
1 0.34
3 1.15
5 2.26
7.5
4.42
10 8.06
12 14.0
15 54.9
OBSOLETE
