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AS1520/AS1521

Data Sheet

Contents

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

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

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

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

Pin Assignments ..................................................................................................................................................... 3

Pin Descriptions ..................................................................................................................................................... 3

5 Absolute Maximum Ratings .................................................................................................................... 4

6 Electrical Characteristics ........................................................................................................................ 5

AS1520 Electrical Characteristics .......................................................................................................................... 5

AS1521 Electrical Characteristics .......................................................................................................................... 7

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

7 Typical Operating Characteristics ......................................................................................................... 11

8 Detailed Description ............................................................................................................................. 14

Analog Input ......................................................................................................................................................... 14

Input Protection ............................................................................................................................................. 14

Track/Hold ............................................................................................................................................................ 14

Control Register ................................................................................................................................................... 15

Analog Input Configuration ................................................................................................................................... 15

Channel Selection ................................................................................................................................................ 16

Single-Ended Input ........................................................................................................................................ 16

Differential Input ............................................................................................................................................ 16

Starting a Conversion ........................................................................................................................................... 17

Transfer Functions ................................................................................................................................................ 18

Power Modes ....................................................................................................................................................... 19

Reduced Power Mode ................................................................................................................................... 20

Full Power-Down Mode ................................................................................................................................. 20

Reference ............................................................................................................................................................. 21

Internal Reference ......................................................................................................................................... 21

External Reference ....................................................................................................................................... 22

9 Application Information ......................................................................................................................... 23

Initialization ........................................................................................................................................................... 23

Serial Interface ..................................................................................................................................................... 23

Serial Interface Configuration ........................................................................................................................ 23

QSPI Interface ............................................................................................................................................... 24

Quick Evaluation Circuit ....................................................................................................................................... 25

Layout Considerations .......................................................................................................................................... 26

10 Package Drawings and Markings ....................................................................................................... 27

11 Ordering Information ........................................................................................................................... 28