AS5040 datasheet(23/28 Pages) AMSCO

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AS5040 10-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.6, 03-Oct-06

www.austriamicrosystems.com

Page 23 of 28

16.5 Electrical System Specifications

(operating conditions: Tamb = -40 to +125°C, VDD5V = 3.0-3.6V (3V operation) VDD5V = 4.5-5.5V (5V operation) unless otherwise noted)

Parameter

Symbol

Min

Typ

Max

Unit

Note

Resolution

RES

bit

0.352 deg

7 bit

8 bit

9 bit

10 bit

LSB

2.813

1.406

0.703

0.352

deg

Adjustable resolution only available for incremental

output modes;

Least significant bit, minimum step

Integral non-linearity (optimum)

INLopt

± 0.5

deg

Maximum error with respect to the best line fit.

Verified at optimum magnet placement, Tamb =25 °C.

Integral non-linearity (optimum)

INLtemp

± 0.9

deg

Maximum error with respect to the best line fit.

Verified at optimum magnet placement ,

Tamb = -40 to +125°C

Integral non-linearity

INL

± 1.4

deg

Best line fit = (Errmax – Errmin) / 2

Over displacement tolerance with 6mm diameter

magnet, Tamb = -40 to +125°C

Differential non-linearity

DNL

± 0.176

deg

10bit, no missing codes

Transition noise

0.12

Deg

RMS

RMS equivalent to 1 sigma

Hysteresis

Hyst

0.704

deg

Incremental modes only

Power-on reset thresholds

On voltage; 300mV typ. hysteresis

Off voltage; 300mV typ. hysteresis

Von

Voff

1,37

1.08

2.2

1.9

2.9

2.6

DC supply voltage 3.3V (VDD3V3)

Power-up time

tPwrUp

ms Until offset compensation finished

System propagation delay

absolute output

tdelay

µs

Includes delay of ADC and DSP

System propagation delay

incremental output

192

µs

Calculation over two samples

9.90

10.42

10.94

Internal sampling rate, Tamb = 25°C

Sampling rate for absolute

output

9.38

10.42

11.46

kHz

Internal sampling rate, Tamb = -40 to +125°C

Read-out frequency

CLK

MHz

Max. clock frequency to read out serial data

180°

360 °

0 °

512

1023

α10bit code

0.35°

INL

Ideal curve

Actual curve

512

1023

DNL+1LSB

[degrees]

Figure 25: Integral and differential non-linearity example (exaggerated curve)

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