AD5421 Analog Devices, AD5421 Datasheet - Page 2

• Manufacturer Part Number: AD5421
• Description: 16-Bit, Serial Input, Loop-Powered, 4mA to 20mA DAC
• Manufacturer: Analog Devices

Specifications of AD5421

• Resolution (bits): 16bit
• Dac Settling Time: 50µs
• Max Pos Supply (v): +52V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: SPI

AD5421
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings .......................................................... 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 13
Terminology .................................................................................... 19
Theory of Operation ...................................................................... 20
REVISION HISTORY
12/11—Rev. B to Rev. C
Change to REFOUT1 Pin, Capacitive Load Parameter, Test
Conditions, Table 1 ........................................................................... 4
Change to REG
Conditions, Table 1 ........................................................................... 5
Changes to ESD Parameter, Table 6 ............................................. 10
12/11—Rev. A to Rev. B
Added 32-Lead LFCSP ....................................................... Universal
Changes to the Specifications Section, Table 1 ............................. 3
Changes to Table 7 .......................................................................... 10
Added Figure 5, Renumbered Sequentially ................................ 11
Changes to Table 8 .......................................................................... 11
Changes to Figure 33 ...................................................................... 17
Changes to the On-Chip ADC Section ........................................ 22
Changes to Figure 46 ...................................................................... 23
Changes to Figure 48 ...................................................................... 24
Changes to the Register Readback Section ................................. 25
Updated Outline Dimensions ....................................................... 33
Changes to Ordering Guide .......................................................... 34
AC Performance Characteristics ................................................ 8
Timing Characteristics ................................................................ 8
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Fault Alerts .................................................................................. 20
External Current Setting Resistor ............................................ 21
Loop Current Range Selection .................................................. 21
Connection to Loop Power Supply .......................................... 21
OUT
Output, Capacitive Load Parameter, Test
Rev. C | Page 2 of 36
Serial Interface ................................................................................ 25
Applications Information .............................................................. 31
Outline Dimensions ....................................................................... 33
5/11—Rev. 0 to Rev. A
Changes to REG
in Table 8 .......................................................................................... 10
Change to Figure 45 ....................................................................... 22
Changes to Input Shift Register Section, Table 11, and Register
Readback Section............................................................................ 24
Changes to Figure 48 ...................................................................... 30
2/11—Revision 0: Initial Version
On-Chip ADC............................................................................. 22
Voltage Regulator ....................................................................... 22
Loop Current Slew Rate Control .............................................. 22
Power-On Default ...................................................................... 23
HART Communications ........................................................... 23
Input Shift Register .................................................................... 25
Register Readback ...................................................................... 25
DAC Register .............................................................................. 26
Control Register ......................................................................... 27
Fault Register .............................................................................. 28
Offset Adjust Register ................................................................ 29
Gain Adjust Register .................................................................. 29
Determining the Expected Total Error .................................... 31
Thermal and Supply Considerations ....................................... 32
Ordering Guide .......................................................................... 34
IN
, REFOUT1, and REFOUT2 Pin Descriptions
Data Sheet