參數(shù)資料
型號： AD7890SQ
英文描述： 450mA, Low Noise Current Mode Step-Down DC/DC Converter; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +85°C
中文描述： 立法會2馬鞍山8通道12位串行數(shù)據(jù)采集系統(tǒng)（191.20十一）
文件頁數(shù)： 3/20頁
文件大?。?/td> 191K
代理商： AD7890SQ
REV. B
–3–
AD7890
ABSOLUTE MAXIMUM RATINGS
*
(T
A
= 25
°
C unless otherwise noted)
V
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
V
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Analog Input Voltage to AGND
AD7890-10, AD7890-4 . . . . . . . . . . . . . . . . . . . . . . .
±
17 V
AD7890-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . –5 V, +10 V
Reference Input Voltage to AGND . . . –0.3 V to V
DD
+ 0.3 V
Digital Input Voltage to DGND . . . . . –0.3 V to V
DD
+ 0.3 V
Digital Output Voltage to DGND . . . . –0.3 V to V
DD
+ 0.3 V
Operating Temperature Range
Commercial (A, B Versions) . . . . . . . . . . . –40
°
C to +85
°
C
Extended (S Version) . . . . . . . . . . . . . . . . –55
°
C to +125
°
C
Storage Temperature Range . . . . . . . . . . . –65
°
C to +150
°
C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150
°
C
Plastic DIP Package, Power Dissipation . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 105
°
C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 260
°
C
Cerdip Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 70
°
C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 300
°
C
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . 450 mW
θ
JA
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 75
°
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.
ORDERING GUIDE
Temperature
Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–55
°
C to +125
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–55
°
C to +125
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–55
°
C to +125
°
C
Linearity
Error
±
1 LSB
±
1/2 LSB
±
1 LSB
±
1/2 LSB
±
1 LSB
±
1 LSB
±
1/2 LSB
±
1 LSB
±
1/2 LSB
±
1 LSB
±
1 LSB
±
1/2 LSB
±
1 LSB
±
1/2 LSB
±
1 LSB
Package
Option
*
Model
AD7890AN-2
AD7890BN-2
AD7890AR-2
AD7890BR-2
AD7890SQ-2
AD7890AN-4
AD7890BN-4
AD7890AR-4
AD7890BR-4
AD7890SQ-4
AD7890AN-10
AD7890BN-10
AD7890AR-10
AD7890BR-10
AD7890SQ-10
N-24
N-24
R-24
R-24
Q-24
N-24
N-24
R-24
R-24
Q-24
N-24
N-24
R-24
R-24
Q-24
*
N = Plastic DIP; Q = Cerdip; R = SOIC.
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 AD7890 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.
Parameter
A Versions
1
B Versions
S Version
Unit
Test Conditions/Comments
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
Serial Data Output Coding
AD7890-10
AD7890-4
AD7890-2
4.0
0.4
4.0
0.4
4.0
0.4
V min
V max
I
SOURCE
= 200
μ
A
I
SINK
Two’s Complement
Straight (Natural) Binary
Straight (Natural) Binary
CONVERSION RATE
Conversion Time
5.9
5.9
5.9
μ
s max
f
CLK IN
= 2.5 MHz, MUX OUT
Connected to SHA IN
Track/Hold Acquisition Time
2, 5
2
2
2
μ
s max
POWER REQUIREMENTS
V
DD
I
DD
(Normal Mode)
I
DD
(Standby Mode)
6
@ 25
°
C
Power Dissipation
Normal Mode
Standby Mode @ 25
°
C
5
10
15
5
10
15
5
10
15
V nom
mA max
μ
A typ
±
5% for Specified Performance
Logic Inputs = 0 V or V
DD
Logic Inputs = 0 V or V
DD
50
75
50
75
50
75
mW max
μ
W typ
Typically 30 mW
NOTES
1
Temperature ranges are as follows: A, B Versions: –40
°
C to +85
°
C; S Version: –55
°
C to +125
°
C.
2
See Terminology.
3
This sample rate is only achievable when tiling the part in external clocking mode.
4
Full-scale error match applies to positive full scale for the AD7890-2 and AD7890-4. It applies to both positive and negative full scale for the AD7890-10.
5
Sample tested @ 25
°
C to ensure compliance.
6
Analog inputs on AD7890-10 must be at 0 V to achieve correct power-down current.
Specifications subject to change without notice.
WARNING!
ESD SENSITIVE DEVICE
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