ADMP421

Data Sheet

Rev. D | Page 2 of 16

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Characteristics ................................................................ 4

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

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

PCB Land Pattern Layout................................................................ 8

Alternate PCB Land Patterns...................................................... 9

Applications Information .............................................................. 10

Interfacing with Analog Devices Codecs................................ 10

Sleep Mode.................................................................................. 10

Power Savings When Disabling One Microphone in a

Multimicrophone Application.................................................. 10

Supporting Documents ............................................................. 10

Handling Instructions.................................................................... 11

Pick-and-Place Equipment ....................................................... 11

Reflow Solder.............................................................................. 11

Board Wash ................................................................................. 11

Reliability Specifications................................................................ 12

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 13

REVISION HISTORY

11/11—Rev. C to Rev. D

Changed PSRR to PSR .......................................................Universal

Changed Pb-Free Temperature from 245°C to 260°C, Table 4 .. 5

Changes to Figure 8 and Figure 9................................................... 8

Added Alternate PCB Land Patterns Section ............................... 9

Changes to Temperature Humidity Bias (THB) Description,

Table 6 .............................................................................................. 12

8/11—Rev. B to Rev. C

Changes to Clock Frequency and Supply Voltage Parameters,

Table 1 ................................................................................................ 3

Changes to Table 3 and Table 4....................................................... 5

Deleted Power-Saving Features Section ........................................ 8

Changes to Figure 9.......................................................................... 8

Added Applications Information Section ..................................... 9

Added Supporting Documents, Evaluation Board User Guides,

Circuit Note, and Application Notes Sections .............................. 9

Changes to Interfacing with Analog Devices Codecs

Section................................................................................................ 9

Moved Sleep Mode Section and Power Savings When Disabling

One Microphone in a Multimicrophone Application Section ... 9

Changes to Figure 10........................................................................ 9

Change to Pick-and-Place Equipment Section........................... 10

Deleted Evaluation Board Section................................................ 10

Deleted Figure 10 and Figure 11; Renumbered Sequentially ... 10

Deleted Table 6; Renumbered Sequentially................................. 10

Deleted Figure 12............................................................................ 11

Change to Temperature Cycle Description, Table 6 .................. 11

Changes to Ordering Guide .......................................................... 12

6/11—Rev. A to Rev. B

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

Changes to Figure 5...........................................................................7

2/11—Rev. 0 to Rev. A

Changes to Features Section, Applications Section, and

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

Added Dynamic Range Parameter, Changes to Input

Characteristics Parameter and Output Characteristics

Parameter, Deleted Polarity Parameter, Table 1 ............................3

Changes to Table 3.............................................................................5

Changes to Table 5.............................................................................6

Added Power-Saving Features Section ...........................................8

Updated Outline Dimensions....................................................... 13

Changes to Ordering Guide.......................................................... 13

4/10—Revision 0: Initial Version