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AD2S100

AC Vector Processor

Analog Devices 

AD2S100

DIGITAL-TO-RESOLVER AND SYNCHRO CONVERSION

The AD2S100 can be configured for use as a 12-bit digital-to-

resolver (DRC) or synchro converter (DSC). DRCs and DSCs

are used to simulate the outputs of a resolver or a synchro. The

simulated outputs are represented by the transforms outlined

below.

Resolver Outputs

Asinωt.cosφ

Asinωt.sinφ

Synchro Outputs

Asinωt.sinφ

Asinωt.sin (φ + 120°)

Asinωt.sin (φ + 240°)

where: Asinωt = fixed ac reference

φ = digital input angle, i.e., shaft position

The waveforms are shown in Figures 18 and 19.

S2 TO S4

(COS)

S3 TO S1

(SIN)

R2 TO R4

(REF)

0°

90°

180°

270°

360°

θ

Figure 18. Electrical Representation and Typical Resolver

Signals

S1 TO S2

S2 TO S3

S3 TO S1

R1 TO R2

0°

90°

180°

270°

360°

θ

Figure 19. Electrical Representation and Typical Synchro

Signals

Configuring the AD2S100 for DRC and DSC operation is done

by the following.

DRC—Must Select Mode 1

Inputs PH/IP4 Pin 11

PH/IP1 Pin 1

Outputs PH/OP1 Pin 7

PH/OP4 Pin 6

AGND

Reference Asinωt

Asinωt Cosφ

Asinωt Sinφ

DSC—Must Select Mode 1

Inputs PH/IP4 Pin 11 Reference Asinωt

PH/IP1 Pin 17 AGND

Outputs PH/OP1 Pin 7 –Asinωt Sinφ

PH/OP2 Pin 9 –Asinωt Sin (φ + 120°)

PH/OP3 Pin 8 –Asinωt Sin (φ + 240°)

NOTES

1. Valid information is only available after the strobe pulse and BUSY go low.

For more information on DRCs see the AD2S65/AD2S66 data sheet.

2. To correct for inverse phasing of the DSC outputs the reference should be

inverted, or the MSB can be inverted.

APPLICATION NOTES LIST

1. “Vector Control Using a Single Vector Rotation Semiconduc-

tor for Induction and Permanent Magnet Motors,” by F. P.

Flett, Analog Devices.

2. “Gamana – DSP Vector Coprocessor for Brushless Motor

Control,” by Analog Devices and Infosys Manufacturing

System.

3. “Silicon Control Algorithms for Brushless Permanent Magnet

Synchronous Machines,” by F. P. Flett.

4. “Single Chip Vector Rotation Blocks and Induction Motor

Field Oriented Control,” by A. P. M. Van den Bossche and

P. J. M. Coussens.

5. “Three Phase Measurements with Vector Rotation Blocks in

Mains and Motion Control,” P. J. M. Coussens, et al.

6. “Digital to Synchro and Resolver Conversion with the AC

Vector Processor AD2S100,” by Dennis Fu.

7. “Experiment with the AD2S100 Evaluation Board,” by

Dennis Fu.

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

44-Lead Plastic Leaded Chip Carrier (P-44A)

0.048 (1.21)

0.042 (1.07)

0.048 (1.21)

0.042 (1.07)

6

7

PIN 1

IDENTIFIER

TOP VIEW

0.056 (1.42)

0.042 (1.07)

40

39

0.180 (4.57)

0.165 (4.19)

0.025 (0.63)

0.015 (0.38)

0.021 (0.53)

0.013 (0.33)

0.63 (16.00)

0.59 (14.99)

0.032 (0.81)

0.026 (0.66)

0.020

(0.50)

R

17

18

0.656 (16.66)

0.650 (16.51) SQ

0.695 (17.65)

0.685 (17.40) SQ

29

28

0.050

(1.27)

BSC

0.040 (1.01)

0.025 (0.64)

0.110 (2.79)

0.085 (2.16)

–12–

REV. A

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