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參數資料
| 型號： | AD7725 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit 900 kSPS ADC with a Programmable Postprocessor |
| 中文描述： | 16位900 ksps模數轉換器的可編程后處理器 |
| 文件頁數： | 8/28頁 |
| 文件大小： | 442K |
| 代理商： | AD7725 |
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REV. A
–8–
AD7725
ABSOLUTE MAXIMUM RATINGS
1
(T
A
= 25
°
C, unless otherwise noted.)
DV
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
AV
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
AV
DD
, AV
DD1
to DV
DD
. . . . . . . . . . . . . . . . . . . . –1 V to +1 V
AGND, AGND1 to DGND . . . . . . . . . . . . . –0.3 V to +0.3 V
Digital Inputs to DGND . . . . . . . . . . –0.3 V to DV
DD
+ 0.3 V
Digital Outputs to DGND . . . . . . . . . –0.3 V to DV
DD
+ 0.3 V
V
IN
(+), V
IN
(–) to AGND . . . . . . . . . . .–0.3 V to AV
DD
+ 0.3 V
REF1 to AGND . . . . . . . . . . . . . . . . .–0.3 V to AV
DD
+ 0.3 V
REF2 to AGND . . . . . . . . . . . . . . . . .–0.3 V to AV
DD
+ 0.3 V
REFIN to AGND . . . . . . . . . . . . . . . .–0.3 V to AV
DD
+ 0.3 V
DGND, AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
0.3 V
Input Current to Any Pin except Supplies
2
. . . . . . . . .
±
10 mA
I
DD
(AI
DD
+ DI
DD
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA
Operating Temperature Range . . . . . . . . . . . .–40
°
C to +85
°
C
Storage Temperature Range . . . . . . . . . . . . .–65
°
C to +150
°
C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150
°
C
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . 58
°
C/W
JC
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . 20
°
C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215
°
C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
°
C
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 kV
NOTES
1
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.
2
Transient currents of up to 100 mA will not cause SCR latch-up.
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
AD7725 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.
ORDERING GUIDE
Temperature
Range
Package
Description
Package
Option
1
Model
AD7725BS
–40
°
C to +85
°
C
Metric Quad
Flatpack
S-44-2
AD7725BS-REEL –40
°
C to +85
°
C
Metric Quad
Flatpack
S-44-2
EVAL-
AD7725CB
2
Evaluation
Board
EVAL-
CONTROL
BRD2
3
Controller
Board
NOTES
1
S = Metric Quad Flat Package (MQFP).
2
This board can be used as a standalone evaluation board or in conjunction with the
Evaluation Board Controller for evaluation/demonstration purposes. It is accom-
panied by software and technical documentation.
3
Evaluation Board Controller. This board is a complete unit allowing a PC to
control and communicate with all Analog Devices boards ending in the CB
designator. To obtain the complete evaluation kit, the following needs to be
ordered: EVAL-AD7725CB, EVAL-CONTROL BRD2, and a 12 V ac transformer.
The Filter Wizard software can be downloaded from the Analog Devices website.
S
T
A
T
U
S
I
N
S
T
RUC
T
I
ON
DB0 DB15
–
INT
RS
CS
RD/
WR
t
34
t
33
t
40
t
36
t
35
t
38
t
23
t
37
t
39
THREE-STATE
THREE-STATE
THREE-STATE
Figure 8. Parallel Mode (Reading the Status Register and Writing Instructions)
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