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參數(shù)資料
| 型號： | 1B51 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Isolated mV/Thermocouple Signal Conditioner(隔離mV/熱電耦信號調(diào)節(jié)器) |
| 中文描述： | 隔離毫伏/熱電偶信號調(diào)理（隔離毫伏/熱電耦信號調(diào)節(jié)器） |
| 文件頁數(shù)： | 1/4頁 |
| 文件大?。?/td> | 89K |
| 代理商： | 1B51 |
REV. A
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.
a
1B51
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAM
Isolated mV/Thermocouple
Signal Conditioner
FEATURES
Functionally Complete Precision Conditioner
High Accuracy
Low Input Offset Tempco:
6
0.1
m
V/
8
C
Low Nonlinearity:
6
0.025%
High CMR: 160 dB (60 Hz, G = 1000 V/V)
High CMV Isolation: 1500 V rms Continuous
240 V rms Input Protection
Small Package: 1.0"
3
2.1"
3
0.35" DIP
Isolated Power
Low-Pass Filter (f
C
= 3 Hz)
Pin Compatible with 1B41 Isolated RTD Conditioner
APPLICATIONS
Multichannel Thermocouple Temperature
Measurement
Low Level Data Acquisition Systems
Industrial Measurement & Control Systems
GE NE RAL DE SCRIPT ION
T he 1B51 is a precision, mV/thermocouple signal conditioner
that incorporates a circuit design utilizing transformer based iso-
lation and automated surface mount manufacturing technology.
It provides an unbeatable combination of versatility and perfor-
mance in a compact plastic package. Designed for measurement
and control applications, it is specially suited for harsh environ-
ments with extremely high common-mode interference. Unlike
costlier solutions that require separate dc/dc converters, each
1B51 generates its own input side power, providing true, low
cost channel-to-channel isolation.
Functionally, the signal conditioner consists of three basic sec-
tions: chopper stabilized amplifier, isolation and output filter.
T he chopper amplifier features a highly stable offset tempco of
±
0.1
μ
V/
°
C and resistor programmable gains from 2 to 1000.
Wide range zero suppression can be implemented at this stage.
T he isolation section has complete input to output galvanic iso-
lation of 1500 V rms continuous using transformer coupling
techniques. Isolated power of 2 mA at
±
6.2 V is provided for
ancillary circuits such as zero suppression and open-input detec-
tion. Filtering at 3 Hz is implemented by a passive antialiasing
filter at the front end and a two-pole active filter at the output.
Overall NMR is 60 dB and CMR is 160 dB min @ 60 Hz,
G = 1000.
T he 1B51 is specified over –25
°
C to +85
°
C and operates over
the industrial (–40
°
C to +85
°
C) temperature range.
DE SIGN FE AT URE S AND USE R BE NE FIT S
High Noise Rejection:
T he combination of a chopper stabi-
lized front end with a low-pass filter provides high system accu-
racy in harsh industrial environments as well as excellent
rejection of 50 Hz/60 Hz noise.
Input Protection:
T he input is internally protected against
continuous application of 240 V rms.
Low Cost:
T he 1B51 offers a very low cost per channel for
high performance, isolated, low level signal conditioners.
Wide Range Zero Suppression:
T his input referred function
is a convenient way to null large input offsets.
Low-Pass Filter:
T he three pole active filter (f
C
= 3 Hz)
reduces 60 Hz noise and aliasing errors.
Small Size:
T he 1B51 package size (1.0"
×
2.1"
×
0.35") and
functional completeness make it an excellent choice in systems
with limited board space and clearance.
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