AD2S93BP AD [Analog Devices], AD2S93BP Datasheet

AD2S93BP

Manufacturer Part Number

AD2S93BP

Description

Low Cost LVDT-to-Digital Converter

Manufacturer

AD [Analog Devices]

Datasheet

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GENERAL DESCRIPTION

The AD2S93 is a complete 14-bit resolution tracking LVDT-to-

digital converter. A Type II tracking loop is employed to track

the A–B input and produce a digital output equal to (A–B)/

(REF/2), where REF is a fixed amplitude ac reference phase co-

herent with the A–B input. This allows the measurement of any

2-, 3-, 4- and 5-wire LVDT or linear amplitude modulated in-

put. The operating frequency range is from 360 Hz to 10 kHz

with user definable bandwidth set externally within a range of

45 Hz to 1250 Hz.

The AD2S93 has a 16-bit serial output. The MSB (LOS), read

first, indicates a loss of the signal A, B, or reference inputs to the

converter or transducer. The second and third MSBs are flags

indicating whether [–REF/2 (UNR) A–B

outside the linear operating range of the converter. The dis-

placement data is presented as 13-bit offset binary giving a 12-

bit operating range. LOS, OVR and UNR are pinned out on

the device, in addition a NULL flag is available which is set

when (A–B) = 0.

Absolute displacement information is accessed when CS is taken

LO followed by the application of an external clock (SCLK)

with a maximum rate of 2 MHz. Data is read MSB first. When

CS is high the DATA output is high impedance; this allows

daisy chaining of more than one converter onto a common bus.

The A, B differential input allows the user to scale the A, B in-

puts between 1 and 10. This enables the user to accurately set

up the inputs matching the REF input to the DIFF output. The

REV. A

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.

FEATURES

Full Function Monolithic LVDT-to-Digital Converter

Absolute Serial Data Output

Uncommitted Differential Input

Repeatability

Remote Diagnostics

14-Bit Resolution

Industrial Temperature Range

28-Pin PLCC

Low Power

APPLICATIONS

Industrial Gauging

Industrial Process Control

Linear Positioning Systems

Linear Actuator Control

Automotive Motion Sensing and Control

Torque Sensing Conditioner

AC Strain Gages Conditioning

Avionics

+REF/2 (OVR]) is

DIFF output is the resultant A–B. The AD2S93 operates using

linear compatible CMOS process (LC

is a mixed technology process that combines precision bipolar

circuits with low power logic.

PRODUCT HIGHLIGHTS

Complete LVDT-to-Digital Interface. The AD2S93 pro-

vides the complete solution for digitizing LVDT signals to 14-

bit resolution.

Serial 16-Bit Output Data. One 16-bit read from the

AD2S93 determines input signal continuity (LOS), over and

underrange detection and 13 bits of offset binary displacement

information.

High Accuracy Grade in Low Cost Package. 0.05% and

0.1% integral linearity over the full –40 C to +85 C operating

temperature range.

Uncommitted Differential Input. Allows configuration of 2-,

3-, 4- and 5-wire LVDTs.

Multiple Converter Interfacing. High impedance data out-

put and a simple three-wire interface reduces cabling and elimi-

nates bus contention.

Low Power. 70 mW power consumption (typ).

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

DIFFERENTIAL

(SECONDARY

5 V

EXCITATION)

REFERENCE

VOLTAGE)

(PRIMARY

5% power supplies and is fabricated on Analog Devices’

DATA

SCLK

NULL

GAIN

OVR

DIFF

UNR

LOS

REF

FUNCTIONAL BLOCK DIAGRAM

LVDT-to-Digital Converter

DECODE

LOS

LOGIC

ACERROR

ERROR

INTERFACE

SERIAL

AMP

AC RATIO

LATCHES

BRIDGE

UP-DOWN

COUNTER

DEMODIN

DEMODULATOR

MOS). The (LC

FREQUENCY

SENSITIVE

SHAPING

PHASE

AD2S93

VCO

AD2S93

Low Cost

Fax: 617/326-8703

CLKOUT

DEMOD OUT

VEL

VCO GAIN

INTIN

DIR

MOS)

Related parts for AD2S93BP

AD2S93BP Summary of contents

Page 1

FEATURES Full Function Monolithic LVDT-to-Digital Converter Absolute Serial Data Output Uncommitted Differential Input Repeatability Remote Diagnostics 14-Bit Resolution Industrial Temperature Range 28-Pin PLCC Low Power APPLICATIONS Industrial Gauging Industrial Process Control Linear Positioning Systems Linear Actuator Control Automotive Motion ...

Page 2

AD2S93–SPECIFICATIONS Parameter SIGNAL INPUTS Frequency 1 Max Voltage Level 2 Nominal Full Scale Input Bias Current Input Impedance CMRR 3 Maximum Sensitivity REFERENCE INPUT Frequency Voltage Level Input Bias Current Input Impedance 4 Permissible Phase Shift CONVERTER DYNAMICS Bandwidth VCO ...

Page 3

Parameter SERIAL CLOCK (SCLK) SCK Input Rate Maximum Read Rate (16 Bits) POWER SUPPLY NOTES 1 The signal input voltage maximum should always be set at 10% less than the reference input. 2 Nominal + FS ...

Page 4

... Model Range Linearity AD2S93AP – +85 C 0.1% AD2S93BP – +85 C 0.05% CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD2S93 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 5

GLOSSARY OF TERMS INTEGRAL LINEARITY Integral linearity deviation as a percent of full scale. A 0.1% de- viation is equivalent to 8-LSB change on the output. Gain The converter gain is the maximum variation in the ratio of A–B/REF/2 to ...

Page 6

AD2S93 0100 0000 0100 1111 0100 0000 0000 0000 0000 1111 0001 0000 0001 0000 0001 1111 0001 1111 0011 0000 0011 0000 LOS 0011 1111 OVR UNR SIGN If the maximum operating stroke of an LVDT yielded a 1 ...

Page 7

Calculation of the component values for the bandwidth is de- tailed below. For more detailed information on component value selection for the AD2S93, please consult the “Passive Component Selection and Dynamic Modeling Software for the AD2S93 LVDT-to-Digital Converter.” VCO Gain ...

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AD2S93BP AD [Analog Devices], AD2S93BP Datasheet

AD2S93BP

Related parts for AD2S93BP

AD2S93BP Summary of contents

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