Datasheet > AD698APZ

AD698APZ

更新时间： 2024-02-27 12:36:12

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	235K
描述
Universal LVDT Signal Conditioner

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技术参数
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AD698APZ 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	24
Reach Compliance Code：	unknown	风险等级：	5.88
最大模拟输入电压：	3.5 V	转换器类型：	SIGNAL CONDITIONER
JESD-30 代码：	R-GDIP-T24	JESD-609代码：	e0
湿度敏感等级：	NOT APPLICABLE	最大负电源电压：	-18 V
最小负电源电压：	-6.5 V	标称负供电电压：	-15 V
功能数量：	1	端子数量：	24
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	CERAMIC, GLASS-SEALED	封装代码：	DIP
封装形状：	RECTANGULAR	封装形式：	IN-LINE
峰值回流温度（摄氏度）：	NOT APPLICABLE	认证状态：	COMMERCIAL
座面最大高度：	5.08 mm	信号/输出频率：	20000 Hz
最大供电电压：	18 V	最小供电电压：	6.5 V
标称供电电压：	15 V	表面贴装：	NO
温度等级：	MILITARY	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT APPLICABLE
宽度：	15.24 mm	Base Number Matches：	1

AD698APZ 数据手册

AD698

TH EO RY O F O P ERATIO N

gain error in the output. T he AD698, eliminates these errors by

calculating the ratio of the LVDT output to its input excitation in

order to cancel out any drift effects. T his device differs from the

AD598 LVDT signal conditioner in that it implements a different

circuit transfer function and does not require the sum of the LVDT

secondaries (A + B) to be constant with stroke length.

A block diagram of the AD698 along with an LVDT (linear

variable differential transformer) connected to its input is shown

in Figure 5 below. T he LVDT is an electromechanical trans-

ducer—its input is the mechanical displacement of a core, and

its output is an ac voltage proportional to core position. T wo

popular types of LVDT s are the half-bridge type and the series

opposed or four-wire LVDT . In both types the moveable core

couples flux between the windings. T he series-opposed con-

nected LVDT transducer consists of a primary winding ener-

gized by an external sine wave reference source and two

secondary windings connected in the series opposed configuration.

T he output voltage across the series secondary increases as the core

is moved from the center. T he direction of movement is detected

by measuring the phase of the output. Half-bridge LVDT s have a

single coil with a center tap and work like an autotransformer. T he

excitation voltage is applied across the coil; the voltage at the center

tap is proportional to position. T he device behaves similarly to a

resistive voltage divider.

T he AD698 block diagram is shown below. T he inputs consist

of two independent synchronous demodulation channels. T he B

channel is designed to monitor the drive excitation to the LVDT .

T he full wave rectified output is filtered by C2 and sent to the

computational circuit. Channel A is identical except that the

comparator is pinned out separately. Since the A channel may

reach 0 V output at LVDT null, the A channel demodulator is

usually triggered by the primary voltage (B Channel). In addi-

tion, a phase compensation network may be required to add a

phase lead or lag to the A Channel to compensate for the LVDT

primary to secondary phase shift. For half-bridge circuits the

phase shift is noncritical, and the A channel voltage is large

enough to trigger the demodulator.

VOLTAGE

REFERENCE

BFILT1

BFILT2

AMP

OSCILLATOR

AD698

CHANNEL

–BIN

+BIN

±1

V/I

OUT

FILTER

AMP

OUT

FILTER

COMP

DUTY CYCLE

DIVIDER

A/B = 1 = 100%

DUTY

–ACOMP

COMP

V/I

Figure 5. Functional Block Diagram

+ACOMP

–AIN

OFF 1

OFF 2

FILTER

T he AD698 energizes the LVDT coil, senses the LVDT output

voltages and produces a dc output voltage proportional to core

position. T he AD698 has a sine wave oscillator and power am-

plifier to drive the LVDT . T wo synchronous demodulation

stages are available for decoding the primary and secondary

voltages. A decoder determines the ratio of the output signal

voltage to the input drive voltage (A/B). A filter stage and out-

put amplifier are used to scale the resulting output.

IREF

500µA

±1

+AIN

DEMODULATOR

AD698

CHANNEL

AFILT1

AFILT2

–V

Figure 6. AD698 Block Diagram

T he oscillator comprises a multivibrator that produces a triwave

output. T he triwave drives a sine shaper that produces a low dis-

tortion sine wave. Frequency and amplitude are determined by a

single resistor and capacitor. Output frequency can range from

20 Hz to 20 kHz and amplitude from 2 V to 24 V rms. T otal har-

monic distortion is typically –50 dB.

Once both channels are demodulated and filtered a division cir-

cuit, implemented with a duty cycle multiplier, is used to calcu-

late the ratio A/B. T he output of the divider is a duty cycle.

When A/B is equal to 1, the duty cycle will be equal to 100%.

(T his signal can be used as is if a pulse width modulated output

is required.) T he duty cycle drives a circuit that modulates and

filters a reference current proportional to the duty cycle. T he

output amplifier scales the 500 µA reference current converting

it to a voltage. T he output transfer function is thus:

T he AD698 decodes LVDT s by synchronously demodulating

the amplitude modulated input (secondaries), A, and a fixed in-

put reference (primary or sum of secondaries or fixed input), B.

A common problem with earlier solutions was that any drift in

the amplitude of the drive oscillator corresponded directly to a

V_OUT= I_REF× A/B × R2, where I_REF= 500 µA

REV. B

–5–

1 2 3 456 7 8...12

中文翻译

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AD698APZ 替代型号

型号	品牌	替代类型	描述	数据表
AD698AP	ADI	类似代替	Universal LVDT Signal Conditioner

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