1B22AN Analog Devices Inc, 1B22AN Datasheet - Page 4
1B22AN
Manufacturer Part Number
1B22AN
Description
IC VOLTAGE CONVERTER PROG DIP
Manufacturer
Analog Devices Inc
Type
Voltage and Current Controllerr
Datasheet
1.1B22AN.pdf
(4 pages)
Specifications of 1B22AN
Rohs Status
RoHS non-compliant
Full Scale
±50ppm/°C
Linearity
±0.02%
Mounting Type
Through Hole
Package / Case
38-DIP (0.800", 20.32mm), 12 Leads
Ic Function
Voltage To Current Converter IC
Supply Voltage Range
14.25V To 15.75V, 14V To 30V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
DIP
No. Of Pins
12
Application
Multichannel process control, D⁄A converter—current loop interface, analog transmitters and controllers, remote data acquisition systems
Bandwidth
400 Hz
Converter Type
Voltage to Current
Current, Output
30 mA
Current, Output, Isolated
4 to 20 or 0 to 20 mA
Current, Quiescent Supply
±7.5 mA
Impedance, Input
50 Kiloohms
Package Type
38 Lead Plas Cust Hybrid
Standards
Meets IEEE STD 472: CMV Transient Protection (SWC)
Temperature, Operating, Maximum
85 °C
Temperature, Operating, Minimum
-40 °C
Voltage, Isolation
1500 V (RMS) (Max.)
Voltage, Operating
±15 V ±5%
Voltage, Protection
240 V (RMS)
Pin Programmable Inputs
0 V to +5 V or 0 V to +10 V
Pin Programmable Outputs
4 to 20 mA or 0 to 20 mA
High Cmv Isolation
1500 V RMS
Normal-mode Output Protection
240 V RMS
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Synchronizing Multiple 1B22s: In applications where mul-
tiple 1B22s are used in close proximity, radiated individual
oscillator frequencies may cause “beat frequency” related out-
put errors. These errors can be eliminated by driving the SYNC
pins of all the units with a 40 kHz clock circuit at 50% duty
cycle (Figure 5). The SYNC input typically has an input imped-
ance of 150 kΩ 180 pF.
Loop Supply Requirements: The 1B22 design allows flexible
loop supply options. The loop supply voltage required for any
value of load resistance can be calculated from the following
equation:
This value allows for approximately 10% overrange capability.
The graph in Figure 6 shows the relationship between supply
voltage and load resistance.
1B22
Figure 5. Multiple 1B22s’ Synchronization
Figure 6. Loop Supply vs. Load
V
LOOP
=
2R
L
106
+ 780
–4–
APPLICATIONS
Isolated D/A Converter: The 1B22 offers total ground isola-
tion and protection from high voltage transients in interfacing
D/A converters to standard 4 to 20 mA current loops. The D/A
converter, such as the Analog Devices’ 12-bit AD7245
DACPORT®, should be connected for operation on the unipo-
lar 0 V to +10 V output range. This is shown in Figure 7.
Pressure Transmitter: In Figure 8, the 1B22 is used in a
pressure transmitter application to provide complete input-
output isolation and avoid signal errors due to ground loop cur-
rents. The process pressure is monitored with a strain gage type
pressure transducer interfaced by the Analog Devices’ 1B32
transducer signal conditioner. The high level voltage output of
the 1B32 is converted to the isolated 4 to 20 mA current for
transmission to a remote recorder or indicator.
DACPORT is a registered trademark of Analog Devices, Inc.
Figure 7. D/A Converter–Isolated 4-20 mA Interface
Figure 8. Isolated Pressure Transmitter
REV. B