参数资料
| 型号： | AD598JR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC LVDT SGNL COND OSC/REF 20SOIC |
| 标准包装： | 1 |
| 类型： | 信号调节器 |
| 输入类型： | 电压 |
| 输出类型： | 电压 |
| 接口： | LVDT |
| 电流 - 电源： | 15mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
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 VA and VB input voltages
are developed as two resistive-inductor dividers. If the inductors
are equal (i.e., the core is centered), the VA and VB input volt-
ages to the AD598 are equal and the output voltage VOUT is
zero. When the core is positioned off center, the inductors are
unequal and an output voltage VOUT 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
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
VA input signal to the AD598 really and truly is a linear function
of core position, and the input signal VB, 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 VA and VB 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
–VS
+VS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
17
18
19
20
VB
VA
0.1
F
0.33
F
0.1
F
–V
0.1
F
0.1
F
+V
82.5k
5k
4nF
SANGAMO
AGHI
HALF-BRIDGE
1
F1F
300
300
MECHANICAL
POSITION
INPUT
VOUT ± 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
–VS
+VS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
17
18
19
20
VB
VA
0.1
F
0.33
F
0.1
F
–V
0.1
F
0.1
F
+V
143k
1.87k
4nF
SANGAMO
AGHI
HALF-BRIDGE
1
F
500
500
MECHANICAL
POSITION
INPUT
VOUT ± 10V
FULL SCALE
Figure 28. Alternate Half-Bridge Circuit
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相关代理商/技术参数 |
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| AD598JRZ | 功能描述:IC LVDT SGNL COND OSC/REF 20SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
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