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1B22 PDF预览

1B22

更新时间: 2022-11-25 14:28:59
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
4页 234K
描述
Programmable, Isolated Voltage-to-Current Converter

1B22 数据手册

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Programmable, Isolated  
Voltage-to-Current Converter  
a
1B22  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Internal Isolated Loop Supply Drives 1000 Load  
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  
High Accuracy  
Low Offset Tempco: ؎300 nA/؇C  
Low Gain Tempco: ؎50 ppm/؇C  
Low Nonlinearity: ؎0.02%  
IN1  
1B22  
OUT  
IN2  
REF  
HI  
RESISTOR  
NETWORK  
SIGNAL  
4mA  
ISOLATION  
OFFSET  
OUT  
LO  
S. NODE  
MODULATOR  
DEMODULATOR  
PROT  
POWER  
ISOLATION  
SYNC  
+15V  
RECTIFIER/  
LOOP SUPPLY  
OSCILLATOR  
–15V  
High CMR: 90 dB min  
Small Package: 1.0" 
؋
 2.10" 
؋
 0.35"  
Meets IEEE STD 472: CMV Transient Protection (SWC)  
A. COM  
V
P. COM  
LOOP  
APPLICATIONS  
Multichannel Process Control  
D/A Converter—Current Loop Interface  
Analog Transmitters and Controllers  
Remote Data Acquisition Systems  
DESIGN FEATURES AND USER BENEFITS  
Isolated Loop Power: Internal loop supply completely  
isolates the loop from the input terminals (1500 V rms) and  
provides the capability to drive 0 to 1000 loads. This elimi-  
nates the need for an external dc/dc converter.  
GENERAL DESCRIPTION  
The 1B22 is an isolated voltage-to-current converter that  
incorporates transformer isolation to achieve high performance  
and automated surface mount manufacturing for low cost  
and increased reliability. Designed for industrial applications,  
it is especially suited for harsh environments with extremely  
high common-mode interference. With programmable inputs  
and outputs, the 1B22 provides an unbeatable combination of  
versatility and performance in a compact plastic package.  
Ease of Use: The 1B22 offers complete isolated voltage-to-  
current conversion with minimum external parts required to get  
a conditioned current signal. No external buffers or drivers are  
required.  
High CMV Isolation: The 1B22 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 1500 V rms and meets  
the IEEE Standard for Common-Mode Voltage Transient Pro-  
tection (STD 472-SWC).  
Functionally, the V/I converter consists of four basic sections:  
input conditioning, modulator/demodulator, isolated loop  
supply and current source (Figure 1). The 1B22 is pin program-  
mable for 0 V to +5 V or 0 V to +10 V inputs and 0 to 20 mA  
or 4 to 20 mA outputs using an internal resistor network. It can  
also be set by an external resistor to accept 0 V to +1 V to 0 V  
to +10 V inputs. Transformer coupling provides 1500 V rms  
galvanic isolation between the inputs and the current loop.  
Nonlinearity is an excellent 0.05% max.  
Small Size: The 1B22 package size (1.0" × 2.1" DIP) makes it  
an excellent choice in multichannel systems for maximum chan-  
nel density. The 0.35" height also facilitates applications with  
limited board clearance.  
Loop power is generated internally through a dc/dc converter  
and is also isolated from the input side (1500 V rms). Loop  
compliance voltage is dependent on the voltage supplied to the  
1B22, and with VLOOP = 28 V, it is sufficient to drive a 1000 Ω  
load.  
The 1B22 is fully specified over –25°C to +85°C and operates  
over the industrial (–40°C to +85°C) temperature range.  
REV. B  
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 implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 2000  

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