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參數(shù)資料
| 型號： | AD420 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Serial Input 16-Bit 4 mA-20 mA, 0 mA-20 mA DAC |
| 中文描述： | 串行輸入16位四毫安- 20毫安，○毫安- 20毫安援 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大小： | 144K |
| 代理商： | AD420 |
REV. F
–3–
AD420
ABSOLUTE MAXIMUM RATINGS*
V
CC
to GND
AD420AR/AN-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 V
I
OUT
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
CC
Digital Inputs to GND . . . . . . . . . . . . . . . . . . . –0.5 V to +7 V
Digital Output to GND . . . . . . . . . . . . . –0.5 V to V
LL
+ 0.3 V
V
LL
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 . . . . . . . . . . . . . . . . . . . . . .
θ
JA
= 75
°
C/W
PDIP (N) Package . . . . . . . . . . . . . . . . . . . . . .
θ
JA
= 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
Temperature
Range
Max Operating Package
Voltage
Model
AD420AN-32 –40
°
C to +85
°
C
AD420AR-32
–40
°
C to +85
°
C
Options*
32 V
32 V
N-24
R-24
*N = Plastic DIP, R = Plastic SOIC.
PIN DESIGNATIONS
TOP VIEW
(Not to Scale)
AD420
NC = NO CONNECT
NC
CAP2
NC
V
CC
NC
V
LL
FAULT DETECT
RANGE SELECT 2
I
OUT
V
OUT
BOOST
CAP1
RANGE SELECT 1
CLEAR
LATCH
CLOCK
DATA IN
DATA OUT
REF IN
OFFSET TRIM
GND
NC
REF OUT
NC
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.
AD420
V
CC
23
4k
V
40
V
BOOST
I
OUT
V
OUT
FAULT
DETECT
GND
CAP 1
OFFSET
TRIM
V
LL
REF OUT
REF IN
DATA OUT
CLEAR
LATCH
CLOCK
DATA IN
RANGE
SELECT 1
RANGE
SELECT 2
1.25k
V
REFERENCE
CLOCK
16-BIT
DAC
DATA I/P
REGISTER
19
20
21
14
15
16
17
18
6
7
8
9
10
11
2
3
4
5
SWITCHED
CURRENT
SOURCES
AND
FILTERING
CAP 2
Figure 1. Functional Block Diagram
Table I. Truth Table
Inputs
Range
Select 2
X
X
Range
Select 1
X
X
CLEAR
0
1
Operation
Normal Operation
Output at Bottom of Span
X
X
X
X
0
0
1
1
0
1
0
1
0 V–5 V Range
4 mA–20 mA Range
0 mA–20 mA Range
0 mA–24 mA Range
WARNING!
ESD SENSITIVE DEVICE
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