AD420AN-32(1999) Просмотр технического описания (PDF) - Analog Devices
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AD420AN-32 Datasheet PDF : 11 Pages
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AD420
ABSOLUTE MAXIMUM RATINGS*
VCC to GND
AD420AR/AN-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 V
IOUT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC
Digital Inputs to GND . . . . . . . . . . . . . . . . . . . –0.5 V to +7 V
Digital Output to GND . . . . . . . . . . . . . –0.5 V to VLL + 0.3 V
VLL and REF OUT: Outputs Safe for Indefinite Short to Ground
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
Thermal Impedance:
SOIC (R) Package . . . . . . . . . . . . . . . . . . . . . . θJA = 75°C/W
PDIP (N) Package . . . . . . . . . . . . . . . . . . . . . . θJA = 50°C/W
*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 indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ORDERING GUIDE
Model
Temperature
Range
AD420AN-32 – 40°C to +85°C
AD420AR-32 – 40°C to +85°C
*N = Plastic DIP, R = Plastic SOIC.
Max Operating Package
Voltage
Options*
32 V
N-24
32 V
R-24
PIN DESIGNATIONS
NC
VL L
FAULT DETECT
RANGE SELECT 2
RANGE SELECT 1
CLEAR
LATCH
CLOCK
DATA IN
DATA OUT
GND
NC
AD420
TOP VIEW
(Not to Scale)
NC
VCC
NC
CAP2
CAP1
BOOST
IOUT
VOUT
OFFSET TRIM
REF IN
REF OUT
NC
NC = NO CONNECT
VLL 2
REF OUT 14
VCC
23
REFERENCE
4k⍀
40⍀
AD420
19 BOOST
REF IN 15
DATA OUT 10
CLEAR 6
LATCH 7
CLOCK 8
DATA IN 9
RANGE
SELECT 1
5
RANGE
SELECT 2
4
DATA I/P
REGISTER
CLOCK
16-BIT
DAC
SWITCHED
CURRENT
SOURCES
AND
FILTERING
18 IOUT
17 VOUT
1.25k⍀
3
FAULT
DETECT
16
20
21
11
OFFSET CAP 1 CAP 2 GND
TRIM
Figure 1. Functional Block Diagram
Table I. Truth Table
CLEAR
0
1
X
X
X
X
Inputs
Range
Select 2
X
X
0
0
1
1
Range
Select 1
X
X
0
1
0
1
Operation
Normal Operation
Output at Bottom of Span
0 V–5 V Range
4 mA–20 mA Range
0 mA–20 mA Range
0 mA–24 mA Range
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 the AD420 features 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
REV. F
–3–
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