ADN2850

Data Sheet

Rev. E | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

Specifications..................................................................................... 3

Electrical Characteristics—25 kΩ, 250 kΩ Versions ............... 3

Interface Timing and EEMEM Reliability Characteristics—

25 kΩ, 250 kΩ Versions............................................................... 5

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

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

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

Typical Performance Characteristics ........................................... 10

Test Circuits................................................................................. 12

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

Scratchpad and EEMEM Programming.................................. 13

Basic Operation .......................................................................... 13

EEMEM Protection.................................................................... 14

Digital Input and Output Configuration................................. 14

Serial Data Interface................................................................... 14

Daisy-Chain Operation ............................................................. 14

Terminal Voltage Operating Range ......................................... 15

Advanced Control Modes ......................................................... 17

RDAC Structure.......................................................................... 18

Programming the Variable Resistor......................................... 19

Programming Examples............................................................ 19

EVAL-ADN2850SDZ Evaluation Kit....................................... 20

Applications Information .............................................................. 21

Gain Control Compensation .................................................... 21

Programmable Low-Pass Filter ................................................ 21

Programmable Oscillator .......................................................... 21

Optical Transmitter Calibration with ADN2841................... 22

Incoming Optical Power Monitoring ...................................... 22

Resistance Scaling ...................................................................... 23

Resistance Tolerance, Drift, and Temperature Coefficient

Mismatch Considerations ......................................................... 24

RDAC Circuit Simulation Model............................................. 24

Outline Dimensions....................................................................... 25

Ordering Guide .......................................................................... 25

REVISION HISTORY

6/12—Rev. D to Rev. E

Changes to Table 1 Conditions....................................................... 4

Removed Positive Supply Current RDY and/or SDO Floating

Parameters and Negative Supply Current RDY and/or SDO

Floating Parameters, Table 1 ........................................................... 4

Updated Outline Dimensions....................................................... 25

Added Endnote 2 to Ordering Guide .......................................... 25

4/11—Rev. C to Rev. D

Changes to Figure 10...................................................................... 10

4/11—Rev. B to Rev. C

Updated Format..................................................................Universal

Changes to EEMEM Performance ...................................Universal

Changes to Features Section............................................................ 1

Changes to Applications Section .................................................... 1

Changes to General Description Section ...................................... 1

Changes to Figure 1.......................................................................... 1

Changes to Specifications Section.................................................. 3

Changes to Table 2............................................................................ 5

Changes to Absolute Maximum Ratings Section......................... 7

Changes to Pin Configuration and Function Descriptions

Section................................................................................................ 8

Changes to Typical Performance Characteristics Section ........ 10

Added Figure 15, Figure 16, Figure 17 ........................................ 11

Changes to Figure 21...................................................................... 12

Changes to Theory of Operation Section.................................... 13

Changes to Figure 25...................................................................... 14

Changes to Programming Variable Resister Section ................. 19

Changes to Table 13 ....................................................................... 19

Changes to EVAL-ADN2850EBZ Evaluation Kit Section ........ 20

Added Gain Control Compensation Section.............................. 21

Added Programmable Low-Pass Filter Section.......................... 21

Added Programmable Oscillator Section.................................... 21

Added Resistance Tolerance, Drift, and Temperature Coeffcient

Mistmatch Considerations Section.............................................. 24

Changes to Outline Dimensions Section .................................... 25

Changes to Ordering Guide.......................................................... 25

9/02—Rev. A to Rev. B

Changes to General Description .....................................................1

Changes to Electrical Characteristics .............................................2

Changes to Calculating Actual Full-Scale Resistance Section.....9

Changes to Table VI ..........................................................................9

Updated Outline Dimensions....................................................... 18