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1B21 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 1B21은 전자 산업 및 응용 분야에서
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부품번호 1B21 기능
기능 Voltage-to-Current Converter
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1B21 데이터시트, 핀배열, 회로
FEATURES
Wide input range: 0 V to 1 V up to 0 V to 10 V
High CMV isolation: 1500 V rms
Programmable output ranges: 4mA to 20mA
0 to 20 mA
Load resistance range: 0 to 1.35 kΩ maximum
High accuracy
Low offset tempco: ±300 nA/°C
Low gain tempco: ±50 ppm/°C
Low nonlinearity: ±0.02%
High CMR: 90 dB minimum
Small package: 0.7” × 2.1” × 0.35”
Meets IEEE Standard 472: transient protection (SWC)
APPLICATIONS
Multichannel process control
DAC—current loop interface
Analog transmitters and controllers
Remote data acquisition systems
GENERAL DESCRIPTION
The 1B21 is an isolated voltage-to-current converter that
incorporates a unique circuit design utilizing transformer-based
isolation and automated surface-mount manufacturing technology.
It provides an unbeatable combination of versatility and perfor-
mance in a compact plastic package. Designed for industrial
applications, it is especially suited for harsh environments with
extremely high common-mode interference.
Functionally, the V/I converter consists of four basic sections:
input conditioning, modulator, demodulator and current source
(see Figure 1). The input is a resistor-programmable gain stage
that accepts a 0 V to 1 V up to 0 V to 10 V voltage input. This
maps into a 0 mA to 20 mA output or can be offset by 20%
using the internal reference for 4 mA to 20 mA operation. The
high level signal is modulated and passed across the barrier
which provides complete input to output galvanic isolation of
1500 V rms continuous by the use of transformer-coupling
techniques. Nonlinearity is an excellent ±0.05% maximum.
Designed for multichannel applications, the 1B21 requires an
external loop supply and can accept up to 30 V maximum. This
Isolated, Loop-Powered
Voltage-to-Current Converter
1B21
FB 18
INPUT 17
REF
OUT
19
+15V 20
–15V 22
COM 21
FUNCTIONAL BLOCK DIAGRAM
SIGNAL
ISOLATION
1
OUT
HIGH
REF
MODULATOR
DEMODULATOR
TIMING
T1
POWER
ISOLATION
TIMING
38
OUT
LOW
OSCILLATOR
T2
RECTIFIER
1B21
Figure 1.
provides a loop supply compliance of 27V, which is sufficient to
drive a 1.35 kΩ load resistance.
The 1B21 is fully specified over −25°C to +85°C and operates
over the industrial (−40°C to +85°C) temperature range.
DESIGN FEATURES AND USER BENEFITS
High CMV Isolation. The 1B21 features high input to output
galvanic isolation to eliminate ground loops and offer protection
against damage from transients and fault voltages. The isolation
barrier will withstand continuous CMV of 1500V rms and
meets the IEEE Standard for Transient Voltage Protection
(Std. 472-SWC).
Small Size. The 1B21 package size (0.7” × 2.1” DIP) makes it an
excellent choice in multichannel systems for maximum channel
density. The 0.35” height also facilitates applications with
limited board clearance.
Ease of Use. Complete isolated voltage-to-current conversion
with minimum external parts required to get a conditioned
current signal. No external buffers or drivers are required.
Rev. C
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1991–2009 Analog Devices, Inc. All rights reserved.




1B21 pdf, 반도체, 판매, 대치품
SPECIFICATIONS
Typical at +25°C and VS = ±15 V, unless otherwise noted.
Table 1.
Parameter
INPUT SPECIFICATIONS
Input Range
Full-Scale Input
Input Bias Current
OUTPUT SPECIFICATIONS
Current Output Range
Load Compliance at VLOOP = 30 V
Max Output Current @ Input Overload
Output Noise, 100 Hz Bandwidth
NONLINEARITY (% of Span)
ISOLATION
CMV, Input to Output Continuous
CMR @ 60 Hz
Transient Protection
ACCURACY
Warm-Up Time to Rated Performance
Total Output Error @ +25°C (Untrimmed)
Offset (VIN = 0 V)1
Span (VIN = +10 V)
vs. Temperature (−25°C to +85°C)
Offset2
Span
REFERENCE OUTPUT
Voltage
Output Error
Temperature Coefficient
DYNAMIC RESPONSE
Settling Time to 0.1% of FS for 10 V Step
Small Signal Bandwidth
POWER SUPPLY
Input Side
Operating Voltage
Quiescent Current
+15 V Supply
−15 V Supply
Power Supply Rejection
Loop Side
Operating Voltage
Maximum Current
ENVIRONMENTAL
Temperature Range
Rated Performance
Operating
Storage
Relative Humidity, Noncondensing
CASE SIZE
Specification
0 V to + 10 V
+1 V min to +10 V max
±30 pA (±400 pA max)
4 mA to 20 mA, 0 mA to 20 mA
27 V min
25 mA
1 μA p-p
±0.02% (±0.05% max)
1500 V rms
90 dB min
IEEE-STD 472 (SWC)
5 min
±100 μA
±0.6% FSR
±300 nA/°C
±50 ppm/°C
+6.225 V dc
±1.0% max
±15 ppm/°C typ
9 ms
100 Hz
±15 V ±5%
10 mA
5 mA
±0.01% V
+15 V to +30 V
25 mA
−25°C to +85°C
−40°C to +85°C
−40°C to +85°C
0 to 95% @ +60°C
0.7” × 2.1” × 0.35”
(17.8 × 53.3 × 8.9) mm
1 For 0 mA to 20 mA mode. For 4 mA to 20 mA mode, an additional 60 μA is contributed by the ±1.0% reference error on the 4 mA output.
2 For a complete discussion of the temperature effects of the offset resistor and reference, refer to the Using the 1B21 section.
Rev. C | Page 3 of 8
1B21

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1B21 전자부품, 판매, 대치품
1B21
TC Considerations of External Resistors
The specifications for gain and offset temperature coefficient
(TC) for the IB21 excluded the effects of external components.
The total gain TC for the circuit in Figure 4 is
Gain TC = 1B21 Gain TC + (Tracking TC of RF and RI)
The offset TC is also affected by the thermal stability of the
internal voltage reference and its contribution is
Ref TC = (VREF)(RF/RO)(4 mA/V)(TC of VREF +
Tracking TC of RF and RO)/1 × 106
Total Offset TC = 1B21 Offset TC + Ref TC
Specifically using RF, RI and RO from Case 3 in Table 2, with
absolute TCs of ±25 ppm/°C
Gain TC = 50 + (25 + 25) = 100 ppm/°C
Offset TC = 300 + (6.225 V)(20k/124.3 k)(4 mA/V)
(20 + 25 + 25)/1 × 106 = ±580 nA/°C
Similarly, when using a resistor network with a tracking spec
of ±5 ppm/°C, the total gain TC is ±55 ppm/°C and the total
offset TC is ±400 nA/°C.
Rev. C | Page 6 of 8

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