Datasheet
AD421
–4–
REV. C
ORDERING GUIDE
Temperature Package
Model Range Option
*
AD421BN –40°C to +85°C N-16
AD421BR –40°C to +85°C R-16
AD421BRRL –40°C to +85°C R-16; Reeled SOIC
EVAL-AD421EB Evaluation Board
*N = Plastic DIP, R = SOIC.
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
DRIVE, BOOST, COMP to COM . . . –0.5 V to V
CC
+ 0.5 V
LOOP RTN to COM . . . . . . . . . . . . . . . . . . . –2 V to + 0.5 V
Digital Input Voltage to COM . . . . . . . –0.5 V to V
CC
+ 0.5 V
Operating Temperature Range
Commercial (B Version) . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Plastic DIP Package, Power Dissipation . . . . . . . . . . 670 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 116°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 260°C
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 110°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
*
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
PIN CONFIGURATION
DIP and SOIC
14
13
12
11
16
15
10
9
8
1
2
3
4
7
6
5
AD421
TOP VIEW
(NOT TO SCALE)
REF OUT1
DRIVE
COMP
BOOST
V
CC
REF OUT2
REF IN
LV
C3
C2
C1
LATCH
CLOCK
DATA
LOOP RTN
COM
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although these devices feature proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE