AD698AP: Universal LVDT Signal Conditioner
The AD698 is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs to convert transducer mechanical position to a unipolar or bipolar dc voltage with a high degree 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. The device will operate with half-bridge LVDTs, LVDTs connected in the series opposed configuration (4-wire), and RVDTs.
The AD698 contains a low distortion sine wave oscillator to drive the LVDT primary. Two synchronous demodulation channels of the AD698 are used to detect primary and secondary amplitude. The part divides the output of the secondary by the amplitude of the primary and multiplies by a scale factor. This eliminates scale factor errors due to drift in the amplitude of the primary drive, improving temperature performance and stability.
The AD698 uses a unique ratiometric architecture to eliminate several of the disadvantages associated with traditional approaches to LVDT interfacing. The benefits of this new circuit are: no adjustments are necessary; temperature stability is improved; and transducer interchangeability is improved.
AD698AP 特点
- 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: ±11 V
Gain Drift: 20 ppm/°C (typ)
Offset Drift: 5 ppm/°C (typ)
AD698AP 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD698AP | 量产 | 28 ld PLCC | 28 | 工业 |
| AD698APZ | 量产 | 28 ld PLCC | 28 | 工业 |
| AD698SQ | 量产 | CERDIP GLASS SEAL | 24 | 军用 |
AD698AP 应用技术支持与电子电路设计开发资源下载
- AD698 数据手册DataSheet 下载 . pdf
- ADI 模拟器件公司比较器产品选型指南 . pdf
- Analog Devices, Inc. 美国模拟器件公司产品订购手册 .pdf
