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參數(shù)資料
| 型號(hào)： | AD598 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LVDT Signal Conditioner(線性可變差分變壓器信號(hào)調(diào)節(jié)器) |
| 中文描述： | LVDT信號(hào)調(diào)節(jié)器（線性可變差分變壓器信號(hào)調(diào)節(jié)器） |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 565K |
| 代理商： | AD598 |
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AD598
REV. A
–15–
OPERATION WITH A HALF-BRIDGE TRANSDUCER
Although the AD598 is not intended for use with a half-bridge
type transducer, it may be made to function with degraded
performance.
A half-bridge type transducer is a popular transducer. It works
in a similar manner to the LVDT in that two coils are wound
around a moveable core and the inductance of each coil is a
function of core position.
In the circuit shown in Figure 27 the V
A
and V
B
input voltages
are developed as two resistive-inductor dividers. If the inductors
are equal (i.e., the core is centered), the V
A
and V
B
input volt-
ages to the AD598 are equal and the output voltage V
OUT
is
zero. When the core is positioned off center, the inductors are
unequal and an output voltage V
OUT
is developed.
The linearity of this circuit is dependent upon the value of the
resistors in the resistive-inductor dividers. The optimum value
may be transducer dependent and therefore must be selected by
trial and error. The 300
resistors in this circuit optimize the
nonlinearity of the transfer function to within several tenths of
1%. This circuit uses a Sangamo AGH1 half-bridge transducer.
The 1
μ
F capacitor blocks the dc offset of the excitation output
signal. The 4 nF capacitor sets the transducer excitation fre-
quency to 10 kHz as recommended by the manufacturer.
ALTERNATE HALF-BRIDGE TRANSDUCER CIRCUIT
This circuit suffers from similar accuracy problems to those
mentioned in the previous circuit description. In this circuit the
V
A
input signal to the AD598 really and truly is a linear function
of core position, and the input signal V
B
, is one half of the exci-
tation voltage level. However, a nonlinearity is introduced by
the A–B/A+B transfer function.
The 500
resistors in this circuit are chosen to minimize errors
caused by dc bias currents from the V
A
and V
B
inputs. Note that
in the previous circuit these bias currents see very low resistance
paths to ground through the coils.
EXC 1
EXC 2
LEV 1
LEV 2
FREQ 1
FREQ 2
B1 FILT
B2 FILT
OFFSET 1
OFFSET 2
SIG REF
SIG OUT
FEEDBACK
OUT FILT
A1 FILT
A2 FILT
AD598
–V
S
+V
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
17
18
19
20
V
B
V
A
0.1
μ
F
0.33
μ
F
0.1
μ
F
–V
0.1
μ
F
0.1
μ
F
+V
82.5k
5k
4nF
SANGAMO
AGHI
HALF-BRIDGE
1
μ
F
1
μ
F
300
300
MECHANICAL
POSITION
INPUT
V
OUT
±
10V
FULL SCALE
Figure 27. Half-Bridge Operation
EXC 1
EXC 2
LEV 1
LEV 2
FREQ 1
FREQ 2
B1 FILT
B2 FILT
OFFSET 1
OFFSET 2
SIG REF
SIG OUT
FEEDBACK
OUT FILT
A1 FILT
A2 FILT
AD598
–V
S
+V
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
17
18
19
20
V
B
V
A
0.1
μ
F
0.33
μ
F
0.1
μ
F
–V
0.1
μ
F
0.1
μ
F
+V
143k
1.87k
4nF
SANGAMO
AGHI
HALF-BRIDGE
1
μ
F
500
500
MECHANICAL
POSITION
INPUT
V
OUT
±
10V
FULL SCALE
Figure 28. Alternate Half-Bridge Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD598A | 制造商:AD 制造商全稱:Analog Devices 功能描述:LVDT Signal Conditioner |
| AD598AD | 功能描述:IC LVDT SIGNAL COND 20-CDIP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD598AD | 制造商:Analog Devices 功能描述:SEMICONDUCTORS LINEAR |
| AD598J | 制造商:AD 制造商全稱:Analog Devices 功能描述:LVDT Signal Conditioner |
| AD598JR | 功能描述:IC LVDT SGNL COND OSC/REF 20SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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