AD7840
TIMING CHARACTERISTICS
1, 2
Parameter
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8 3
t
9
t
10
t
11
Limit at T
MIN
, T
MAX
(J, K, A, B Versions)
0
0
45
21
10
40
50
150
30
75
75
(V
DD
= +5 V
5%, V
SS
= –5 V
5%, AGND = DGND = 0 V.)
Units
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
Conditions/Comments
CS
to
WR
Setup Time
CS
to
WR
Hold Time
WR
Pulse Width
Data Valid to
WR
Setup Time
Data Valid to
WR
Hold Time
LDAC
Pulse Width
SYNC
to SCLK Falling Edge
SCLK Cycle Time
Data Valid to SCLK Setup Time
Data Valid to SCLK Hold Time
SYNC
to SCLK Hold Time
Limit at T
MIN
, T
MAX
(S Version)
0
0
50
28
15
40
50
200
40
100
100
NOTES
1
Timing specifications in
bold print
are 100% production tested. All other times are sample tested at +25
°C
to ensure compliance. All input signals are specified with
tr = tf = 5 ns (10% to 90% of 5 V) and timed from a voltage level of 1.6 V.
2
See Figures 6 and 8.
3
SCLK mark/space ratio is 40/60 to 60/40.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*
ORDERING GUIDE
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
–55°C to +125°C
SNR
(dB)
78 min
80 min
78 min
80 min
78 min
78 min
80 min
78 min
Integral
Nonlinearity
(LSB)
±
2 max
±
1 max
±
2 max
±
1 max
±
2 max
±
2 max
±
1 max
±
2 max
Package
Option
2
N-24
N-24
P-28A
P-28A
Q-24
RS-24
Q-24
Q-2
4
V
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
V
SS
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –7 V
AGND to DGND . . . . . . . . . . . . . . . . –0.3 V to V
DD
+ 0.3 V
V
OUT
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . V
SS
to V
DD
REF OUT to AGND . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
DD
REF IN to AGND . . . . . . . . . . . . . . . . –0.3 V to V
DD
+ 0.3 V
Digital Inputs to DGND . . . . . . . . . . . –0.3 V to V
DD
+ 0.3 V
Operating Temperature Range
Commercial (J, K Versions) . . . . . . . . . . . . . . 0°C to +70°C
Industrial (A, B Versions) . . . . . . . . . . . . . . –25°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . 10 mW/°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and 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.
Model
1
AD7840JN
AD7840KN
AD7840JP
AD7840KP
AD7840AQ
AD7840ARS
AD7840BQ
AD7840SQ
3
NOTES
1
To order MIL-STD-883, Class B processed parts, add /883B to part number.
Contact your local sales office for military data sheet and availability.
2
N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip.
3
This grade will be available to /883B processing only.
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 AD7840 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. B
–3–
AD [ ANALOG DEVICES ]
