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參數(shù)資料
| 型號(hào)： | AD698SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 位置變換器 |
| 英文描述： | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| 中文描述： | SIGNAL CONDITIONER, CDIP24 |
| 封裝： | DOUBLE WIDTH, CERAMIC, DIP-24 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 228K |
| 代理商： | AD698SQ |
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.
a
Universal
LVDT Signal Conditioner
AD698
Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
Single Chip Solution, Contains Internal Oscillator and
Voltage Reference
No Adjustments Required
Interfaces to Half-Bridge, 4-Wire LVDT
DC Output Proportional to Position
20 Hz to 20 kHz Frequency Range
Unipolar or Bipolar Output
Will Also Decode AC Bridge Signals
Outstanding Performance
Linearity: 0.05%
Output Voltage:
6
11 V
Gain Drift: 20 ppm/
8
C (typ)
Offset Drift: 5 ppm/
8
C (typ)
PRODUCT DE SCRIPT ION
T he AD698 is a complete, monolithic Linear Variable Differen-
tial T ransformer (LVDT ) signal conditioning subsystem. It is
used in conjunction with LVDT s to convert transducer mechan-
ical position to a unipolar or bipolar dc voltage with a high de-
gree of accuracy and repeatability. All circuit functions are
included on the chip. With the addition of a few external passive
components to set frequency and gain, the AD698 converts the
raw LVDT output to a scaled dc signal. T he device will operate
with half-bridge LVDT s, LVDT s connected in the series op-
posed configuration (4-wire), and RVDT s.
T he AD698 contains a low distortion sine wave oscillator to
drive the LVDT primary. T wo synchronous demodulation
channels of the AD698 are used to detect primary and second-
ary amplitude. T he part divides the output of the secondary by
the amplitude of the primary and multiplies by a scale factor.
T his eliminates scale factor errors due to drift in the amplitude
of the primary drive, improving temperature performance and
stability.
T he AD698 uses a unique ratiometric architecture to eliminate
several of the disadvantages associated with traditional ap-
proaches to LVDT interfacing. T he benefits of this new cir-
cuit are: no adjustments are necessary; temperature stability is
improved; and transducer interchangeability is improved.
T he AD698 is available in two performance grades:
Grade
T emperature Range
AD698AP
–40
°
C to +85
°
C
AD698SQ
–55
°
C to +125
°
C
Package
28-Pin PLCC
24-Pin Cerdip
PRODUCT HIGHLIGHT S
1. T he AD698 offers a single chip solution to LVDT signal
conditioning problems. All active circuits are on the mono-
lithic chip with only passive components required to com-
plete the conversion from mechanical position to dc voltage.
2. T he AD698 can be used with many different types of posi-
tion sensors. T he circuit is optimized for use with any
LVDT , including half-bridge and series opposed, (4 wire)
configurations. T he AD698 accommodates a wide range of
input and output voltages and frequencies.
3. T he 20 Hz to 20 kHz excitation frequency is determined by a
single external capacitor. T he AD698 provides up to 24 volts
rms to differentially drive the LVDT primary, and the
AD698 meets its specifications with input levels as low as
100 millivolts rms.
4. Changes in oscillator amplitude with temperature will not af-
fect overall circuit performance. T he AD698 computes the
ratio of the secondary voltage to the primary voltage to deter-
mine position and direction. No adjustments are required.
5. Multiple LVDT s can be driven by a single AD698 either in
series or parallel as long as power dissipation limits are not
exceeded. T he excitation output is thermally protected.
6. T he AD698 may be used as a loop integrator in the design of
simple electromechanical servo loops.
7. T he sum of the transducer secondary voltages do not need to
be constant.
FUNCT IONAL BLOCK DIAGRAM
A
B
AMP
OSCILLATOR
VOLTAGE
REFERENCE
A
B
FILTER
AMP
AD698
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