ad7891as-2z Analog Devices, Inc., ad7891as-2z Datasheet - Page 3

• Manufacturer Part Number: ad7891as-2z
• Description: Lc2 Mos 8-channel, 12-bit High Speed Data Acquisition System
• Manufacturer: Analog Devices, Inc.

ABSOLUTE MAXIMUM RATINGS*
(T
V
V
Analog Input Voltage to AGND
Reference Input Voltage to AGND . . . . –0.3 V to V
Digital Input Voltage to DGND . . . . . . –0.3 V to V
Digital Output Voltage to DGND . . . . . –0.3 V to V
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C
Parameter
LOGIC OUTPUTS
CONVERSION RATE
POWER REQUIREMENTS
NOTES
1
2
3
4
5
6
Specifications subject to change without notice.
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 AD7891 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.
REV. D
See the Terminology section.
Sample tested during initial release and after any redesign or process change that may affect this parameter.
Temperature ranges for the A and B Versions: –40∞C to +85∞C. Temperature range for the Y Version: –55∞C to +105∞C.
The AD7891-1’s dynamic performance (THD and SNR) and the AD7891-2’s THD are measured with an input frequency of 10 kHz. The AD7891-2’s SNR is
evaluated with an input frequency of 100 kHz.
This throughput rate can only be achieved when the part is operated in the parallel interface mode. Maximum achievable throughput rate in the serial interface mode
is 357 kSPS.
REF IN must be buffered before being applied to V
DD
DD
A
AD7891-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 17 V
AD7891-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . –5 V, +10 V
Commercial (A, B Versions) . . . . . . . . . . . –40∞C to +85∞C
Automotive (Y Version) . . . . . . . . . . . . . . –55∞C to +105∞C
Output High Voltage, V
Output Low Voltage, V
DB11to DB0
Output Coding
Conversion Time
Track/Hold Acquisition Time
V
I
Power Dissipation
DD
= 25∞C, unless otherwise noted)
DD
Floating-State Leakage Current
Floating-State Capacitance
Normal Mode
Standby Mode
Normal Mode
Standby Mode
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
OL
OH
5
A Version
4.0
0.4
± 10
15
0.7
0.4
5
80
1.6
0.6
20
100
400
Straight (Natural) Binary
Twos Complement
INXB
.
1
B Version
4.0
0.4
± 10
15
1.6
0.6
0.7
0.4
5
20
80
100
400
DD
DD
DD
+ 0.3 V
+ 0.3 V
+ 0.3 V
Y Version
4.0
0.4
± 10
15
1.6
0.6
0.7
0.4
5
21
80
105
400
–3–
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150∞C
MQFP Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
PLCC Package, Power Dissipation . . . . . . . . . . . . . . 500 mW
*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.
q
Lead Temperature, Soldering
q
Lead Temperature, Soldering
JA
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215∞C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . 220∞C
JA
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215∞C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . 220∞C
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 95∞C/W
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 55∞C/W
Unit
V min
V max
mA max
pF max
ms max
ms max
ms max
ms max
V nom
mA max
mA max
mW max
mW max
Test Conditions/Comments
I
I
Data format bit of control register = 0.
Data format bit of control register = 1.
AD7891-1 hardware conversion.
AD7891-1 software conversion.
AD7891-2.
± 5% for specified performance.
Logic inputs = 0 V or V
V
Typically 82 mW.
Typically 75 mW.
SOURCE
SINK
DD
= 5 V.
= 1.6 mA.
= 200 mA.
DD
.
AD7891