AD2S90AP - Analog Devices - Low Cost, Complete 12-Bit Resolver-to-Digital Converter



Detailed Product Description

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Low Cost, Complete 12-Bit Resolver-to-Digital Converter





The AD2S90 is a complete 12-bit resolution tracking resolverto-digital converter. No external components are required to operate the device.

The converter accepts 2 V rms ± 10% input signals in the range

3 kHz–20 kHz on the SIN, COS and REF inputs. A Type II servo loop is employed to track the inputs and convert the input SIN and COS information into a digital representation of the input angle. The bandwidth of the converter is set internally at 1 kHz within the tolerances of the device. The guaranteed maximum tracking rate is 500 rps. Angular position output information is available in two forms, absolute serial binary and incremental A quad B.

The absolute serial binary output is 12-bit (1 in 4096). The data output pin is high impedance when Chip Select CS is logic HI. This allows the connection of multiple converters onto a common bus. Absolute angular information in serial pure binary form is accessed by CS followed by the application of an external clock (SCLK) with a maximum rate of 2 MHz.

The encoder emulation outputs A, B and NM continuously produce signals equivalent to a 1024 line encoder. When decoded this corresponds to 12 bits of resolution. Three common north marker pulsewidths are selected via a single pin (NMC).

An analog velocity output signal provides a representation of velocity from a rotating resolver shaft traveling in either a clockwise or counterclockwise direction.

The AD2S90 operates on ±5 V dc ± 5% power supplies and is fabricated on Analog Devices’ Linear Compatible CMOS process (LC2MOS). LC2

MOS is a mixed technology process that combines precision bipolar circuits with low power CMOS logic circuits.





Complete Monolithic Resolver-to-Digital Converter

Incremental Encoder Emulation (1024-Line)

Absolute Serial Data (12-Bit)

Differential Inputs

12-Bit Resolution

Industrial Temperature Range

20-Lead PLCC

Low Power (50 mW)


Industrial Motor Control

Servo Motor Control

Industrial Gauging

Encoder Emulation

Automotive Motion Sensing and Control

Factory Automation

Limit Switching





Product Photos

20-PLCC Pkg

Standard Package



Integrated Circuits (ICs)


Data Acquisition - ADCs/DACs - Special Purpose






R/D Converter

Resolution (Bits)

12 b

Sampling Rate (Per Second)


Data Interface


Voltage Supply Source

Dual ±

Voltage - Supply

±4.75 V ~ 5.25 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

20-LCC (J-Lead)

Supplier Device Package

20-PLCC (9x9)


Competitive Advantage:


Warranty :180days for all goods

Free shipping:Order over $600 win a free shipment fee:goods weight below 3Kg.

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