Analog Devices AD2S105AP Datasheet

Three-Phase

I

S1

Vds

Vqs

SECTOR

MULTIPLIER

SINE AND

COSINE

MULTIPLIER

INPUT
DATA

STROBE

HOMOPOLAR

OUTPUT

HOMOPOLAR

REFERENCE

+5V GND –5V

φ

POSITION

PARALLEL

DATA

12 BITS

3

φ-2φ

Cos (θ + 120°)

Cos (θ + 240°)

SinθCosθ

Cosθ

Sinθ

Cos θ + φ

CONV1
CONV2

DECODE

BUSY

Vds'

Vqs'

Sin

θ + φ

SECTOR

MULTIPLIER

SINE AND

COSINE

MULTIPLIER

Ia + Ib + Ic

3

I

S2

I

S3

a

FEATURES
Current Conditioning
Complete Vector Transformation on Silicon
Three-Phase 120° and Orthogonal 90° Signal

Transformation
Three-Phase Balance Diagnostic–Homopolar Output
DQ Manipulation
Real-Time Filtering

APPLICATIONS
AC Induction Motor Control
Spindle Drive Control
Pump Drive Control
Compressor Drive Control and Diagnostics
Harmonic Measurement
Frequency Analysis
Three-Phase Power Measurement

GENERAL DESCRIPTION

The AD2S105 performs the vector rotation of three-phase 120
degree or two-phase 90 degree sine and cosine signals by trans­ferring these inputs into a new reference frame which is controlled
by the digital input angle φ. Two transforms are included in the
AD2S105. The first is the Clarke transform which computes
the sine and cosine orthogonal components of a three-phase in­put. These signals represent real and imaginary components
which then form the input to the Park transform. The Park
transform relates the angle of the input signals to a reference
frame controlled by the digital input port. The digital input
port on the AD2S105 is a 12-bit/parallel natural binary port.

If the input signals are represented by Vds and Vqs, respectively,
where Vds and Vqs are the real and imaginary components, then
the transformation can be described as follows:

Vds' = Vds Cosφ – Vqs Sinφ
Vqs' = Vds Sinφ + Vqs Cosφ

Where Vds' and Vqs' are the output of the Park transform
and Sinφ, and Cosφ are the trigonometric values internally cal­culated by the AD2S105 from the binary digital data φ.

The input section of the device can be configured to accept
either three-phase inputs, two-phase inputs of a three-phase
system, or two 90 degree input signals. The homopolar output
indicates an imbalance of a three-phase input only at a user­specified level.

The digital input section will accept a resolution of up to 12 bits.
An input data strobe signal is required to synchronize the position
data and load this information into the device counters.

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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.

Current Conditioner

AD2S105

FUNCTIONAL BLOCK DIAGRAM

A two-phase rotated output facilitates the implementation of
multiple rotation blocks.

The AD2S105 is fabricated on LC
±5 volt power supplies.

PRODUCT HIGHLIGHTS

Current Conditioning

The AD2S105 transforms the analog stator current signals (I
I

, I

) using the digital angular signal (reference frame) into dc

2

3

s

s

values which represent direct current (I
rent (I

). This transformation of the ac signals into dc values

qs

simplifies the design of the analog-to-digital (A/D) conversion
scheme. The A/D conversion scheme is simplified as the band­width sampling issues inherent in ac signal processing are
avoided and in most drive designs, simultaneous sampling of the
stator currents may not be necessary.

Hardware Peripheral for Standard Microcontroller and DSP
Systems

The AD2S105 off-loads the time consuming Cartesian transfor­mations from digital processors and benchmarks show a signifi­cant speed improvement over single processor designs. AD2S105
transformation time = 2 µs.

Field Oriented Control of AC Motors

The AD2S105 accommodates all the necessary functions to pro­vide a hardware solution for current conditioning in variable
speed control of ac synchronous and asynchronous motors.

Three-Phase Imbalance Detection

The AD2S105 can be used to sense imbalances in a three-phase
system via the homopolar output.

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

2

MOS and operates on

) and quadrature cur-

ds

,

s1

(VDD = +5 V ± 5%; VSS = –5 V ± 5% AGND = DGND = O V;

AD2S105–SPECIFICATIONS

TA = –40°C to +85°C, unless otherwise noted)

Parameter Min Typ Max Units Conditions

SIGNAL INPUTS

PH/IP1, 2, 3, 4 Voltage Level ±2.8 ±3.3 V p-p DC to 50 kHz
PH/IPH1, 2, 3 Voltage Level ±4.25 V p-p DC to 50 kHz
Input Impedance

PH/IP1, 2, 3 7.5 10 kΩ
PH/IPH1, 2, 3 13.5 18 kΩ
PH/IP1, 4 1 MΩ Mode 1 Only (2 Phase)

Sin & Cos

Gain

PH/IP1, 2, 3, 4 0.95 1 1.05
PH/IPH1, 2, 3 0.56

VECTOR PERFORMANCE

3-Phase Input-Output

Radius Error (Any Phase) ±0.4 ±1 % DC to 600 Hz
Angular Error

1, 2

PH/IP 15 30 arc min DC to 600 Hz
PH/IPH 30 arc min DC to 600 Hz

Differential Nonlinearity ±1 LSB
Full Power Bandwidth 50 kHz
Small Signal Bandwidth 200 kHz

ANALOG SIGNAL OUTPUTS

PH/OP1, 4 PH/IP, PH/IPH INPUTS

Output Voltage

3

±2.8 ±3.3 V p-p DC to 50 kHz

Offset Voltage 2 10 mV Inputs = 0 V
Slew Rate 2 V/µs
Small Signal Step Response 1 µs1° Input to Settle to

±1 LSB (Input to Output)

Output Impedance 15 Ω
Output Drive Current 3.0 4.0 mA Outputs to AGND
Resistive Load 2 kΩ
Capacitive Load 50 pF

STROBE

Write 100 ns Positive Pulse
Max Update Rate 366 kHz

BUSY

Pulse Width 1.7 2.5 µs Conversion in Process
V

OH

V

OL

4V dcI

1V dcI

= 0.5 mA

OH

= 0.5 mA

OL

DIGITAL INPUTS

DB1–DB12

V

IH

V

IL

Input Current, I

IN

Input Capacitance, C

IN

3.5 V dc

1.5 V dc
±10 µA

10 pF

CONV MODE

(CONV1, CONV2)

V

IH

V

IL

3.5 V dc

1.5 V dc

Input Current 100 µA Internal 50 kΩ
Input Capacitance 10 pF Pull-Up Resistor

–2–

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AD2S105

WARNING!

ESD SENSITIVE DEVICE

Parameter Min Typ Max Units Conditions

HOMOPOLAR OUTPUT

HPOP–OUTPUT

V

OH

V

OL

HPREF–REFERENCE 0.5 V dc Homopolar Output-Internal

POWER SUPPLY

V

DD

V

SS

I

DD

I

SS

NOTES

1

Angular accuracy includes offset and gain errors, measured with a stationary digital input and maximum analog frequency inputs.

2

The angular error does not include the additional error caused by the phase delay as a function of input frequency. For example, if f

to the error due to phase delay is: 650 ns × f

3

Output subject to input voltage and gain.

Specifications subject to change without notice.

× 60 × 360 = 8.4 arc minutes.

INPUT

4V dcI

1V dcI

= 0.5 mA

OH

= 0.5 mA

OL

I

= 25 µA and 20 kΩ to AGND

SOURCE

4.75 5 5.25 V dc
–5.25 –5 –4.75 V dc

4 10 mA Quiescent Current
4 10 mA Quiescent Current

= 600 Hz, the contribution

INPUT

RECOMMENDED OPERATING CONDITIONS

Power Supply Voltage (+VDD, –V

) . . . . . . . . . ±5 V dc ± 5%

SS

Analog Input Voltage (PH/IP1, 2, 3, 4) . . . . . . 2 V rms ± 10%

Analog Input Voltage (PH/IPH1, 2, 3) . . . . . . 3 V rms ± 10%

Ambient Operating Temperature Range

Industrial (AP) . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C

ABSOLUTE MAXIMUM RATINGS (TA = +25°C)

VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V dc

V

to AGND . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –7 V dc

SS

AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V dc

Analog Input Voltage to AGND . . . . . . . . . . . . . . . V

Digital Input Voltage to DGND . . . . –0.3 V to V

Digital Output Voltage to DGND . . . . . . –0.3 V to V

to V

SS

+ 0.3 V dc

DD

DD

DD

+ V dc

Analog Output Voltage to AGND

. . . . . . . . . . . . . . . . . . . . . . V

– 0.3 V to VDD + 0.3 V dc

SS

Analog Output Load Condition (PH/OP1, 4

Sinθ, Cosθ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kΩ

Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . .140 mW

Operating Temperature

Industrial (AP) . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

Storage Temperature . . . . . . . . . . . . . . . . .–65°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . +300°C

CAUTION

1. Absolute Maximum Ratings are those values beyond which
damage to the device will occur.

2. Correct polarity voltages must be maintained on the +V

DD

and –VSS pins

ORDERING GUIDE

Model Temperature Range Accuracy Option*

AD2S105AP –40°C to +85°C 30 arc min P-44A

*P = Plastic Leaded Chip Carrier.

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 AD2S105 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

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–3–

AD2S105

6 5 4 3 2 1 44 43 42 41 40

18 19 20 21 22 23 24 25 26 27 28

29

30

31

32

33

34

35

36

37

38

39

V

SS

V

DD

STROBE

NC

NC

BUSY

DGND

V

DD

NC

NC

V

SS

HPREF

HPOP

CONV1

CONV2

COS

DB12

HPFILT

DB11

NC = NO CONNECT.

TOP VIEW

(NOT TO SCALE)

AD2S105

PH/OP4

NC

SIN

7

8

11

12

13

14

15

16

17

9

10

NC

DB1

DB2

DB3

DB4

DB5

DB6

DB7

DB8

DB9

DB10

PH/OP1

NC

NC

AGND

PH/IP4

PH/IPH3

PH/IP3

PH/IPH2

PH/IP2

PH/IPH1

PH/IP1

PIN DESIGNATIONS

1, 2, 3

Pin Mnemonic Description

3 STROBE Begin Conversion
4V
5V

DD
SS

Positive Power Supply
Negative Power Supply

6 PH/OP4 Sin (θ + φ)
7 PH/OP1 Cos (θ + φ)
10 AGND Analog Ground
11 PH/IP4 Sin θ Input
12 PH/IPH3 High Level Cos

(θ + 240°) Input

13 PH/IP3 Cos (θ + 240°) Input
14 PH/IPH2 High Level Cos

(θ + 120°) Input
15 PH/IP2 Cos (θ + 120°) Input
16 PH/IPH1 High Level Cos θ Input
17 PH/IP1 Cos (θ) Input
19 V

SS

Negative Power Supply
20 HPREF Homopolar Reference
21 HPOP Homopolar Output
22 HPFILT Homopolar Filter
23 CONV1 Select Analog Input

Format
24 CONV2 Select Analog Input

Format
25 COS Cos Output
26 SIN Sin Output
27–38 DB12 to DB1 (DB1 = MSB, DB12 =

LSB Parallel Input Data)
41 V

DD

Positive Power Supply
42 DGND Digital Ground
44 BUSY Internal Logic Setup

Time

NOTES

1

90° orthogonal signals = Sin θ, Cos θ (Resolver) = PH/IP4 and PH/IP1.

2

Three phase, 120°, three-wire signals = Cos θ, Cos (θ + 120°), Cos (θ + 240°).

= PH/IP1, PH/IP2, PH/IP3
High Level = PH/IPH1, PH/IPH2, PH/IPH3.

3

Three Phase, 120°, two-wire signals = Cos (θ + 120°), Cos (θ + 240°) =

PH/IP2, PH/IP3.
In all cases where any of the input Pins 11 through 17 are not used, they must
be left unconnected.

PIN CONFIGURATION

–4–

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