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AS1545

Data Sheet - A p p l i c a t i o n s

Contents

1 General Description

................................................................................................................................................ 1

2 Key Features

........................................................................................................................................................... 1

3 Applications

............................................................................................................................................................. 1

4 Pinout

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Pin Assignment

.................................................................................................................................................... 3

Pin Description

3

5 Absolute Maximum Ratings

.................................................................................................................................... 5

6 Electrical Characteristics

......................................................................................................................................... 6

Timing Characteristics ..................................................................................................................................... 9

7 Typical Operating Characteristics

......................................................................................................................... 10

8 Terminology

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9 Detailed Description

.............................................................................................................................................. 18

Analog Input

....................................................................................................................................................... 18

Acquisition Time ............................................................................................................................................ 18

Analog Input Composition ............................................................................................................................. 19

Analog Input Modes ...................................................................................................................................... 20

Single-Ended Mode ....................................................................................................................................... 21

Fully Differential Mode .................................................................................................................................. 21

Pseudo Differential Mode .............................................................................................................................. 22

Analog-to-Digital Conversion

............................................................................................................................. 23

Output Coding ............................................................................................................................................... 23

Transfer Functions ........................................................................................................................................ 23

Digital Inputs

...................................................................................................................................................... 24

VDRIVE Functionality..................................................................................................................................... 24

10 Application Information

....................................................................................................................................... 25

Operation Modes

............................................................................................................................................... 25

Full Power-Up Mode ..................................................................................................................................... 25

Full Power-Down Mode ................................................................................................................................. 25

Partial Power-Down Mode ............................................................................................................................ 26

Power-Up Times ........................................................................................................................................... 27

Power vs. Throughput Rate .......................................................................................................................... 28

Serial Interface

................................................................................................................................................... 28

Difference calculator and quadrature signals calculator ................................................................................ 29

Direction of the rotor based on DIR bit .......................................................................................................... 30

11 Application Hints

.................................................................................................................................................. 31

Grounding and Layout ................................................................................................................................... 31

PCB Design Guidelines for TQFN ................................................................................................................. 31

12 Package Drawings and Markings

........................................................................................................................ 32

13 Ordering Information

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