ADN8835

Data Sheet

Rev. B | Page 2 of 27

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

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

Revision History ............................................................................... 2

Detailed Functional Block Diagram .............................................. 3

Specifications..................................................................................... 4

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

Maximum Power Dissipation ..................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

Theory of Operation ...................................................................... 13

Analog PID Control................................................................... 14

Digital PID Control.................................................................... 14

Powering the Controller ............................................................ 14

Enable and Shutdown ................................................................ 15

Oscillator Clock Frequency....................................................... 15

Temperature Lock Indicator ..................................................... 15

Soft Start on Power-Up.............................................................. 15

TEC Voltage/Current Monitor ................................................. 16

Maximum TEC Voltage Limit .................................................. 16

Maximum TEC Current Limit ................................................. 16

Applications Information.............................................................. 18

Signal Flow .................................................................................. 18

Thermistor Setup........................................................................ 18

Thermistor Amplifier (Chopper 1).......................................... 19

PID Compensation Amplifier (Chopper 2)............................ 19

MOSFET Driver Amplifiers...................................................... 20

PWM Output Filter Requirements .......................................... 20

Input Capacitor Selection.......................................................... 21

Power Dissipation....................................................................... 21

Thermal Consideration ............................................................. 22

PCB Layout Guidelines.................................................................. 23

Block Diagrams and Signal Flow ............................................. 23

Guidelines for Reducing Noise and Minimizing Power Loss23

Example PCB Layout Using Two Layers................................. 24

Outline Dimensions....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

9/2018—Rev. A to Rev. B

Added Patent Information................................................................. 1

Changes to Specifications, Table 2, Voltage Measurement

Accuracy Parameter ......................................................................... 6

5/2017—Rev. 0 to Rev. A

Changes to PID Compensation Amplifier (Chopper 2) Section... 18

Changes to Ordering Guide .......................................................... 26

12/2016—Revision 0: Initial Version