AS1545 データシートの表示（PDF） - austriamicrosystems AG

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AS1545

Dual, 12-Bit, 1MSPS, SAR ADC

austriamicrosystems AG 

AS1545

Datasheet

Contents

1 General Description ................................................................................................................................................ 1

2 Key Features ........................................................................................................................................................... 1

3 Applications ............................................................................................................................................................. 1

4 Pinout ...................................................................................................................................................................... 3

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 ........................................................................................................................................................... 15

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 ........................................................................................................................................... 33

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