Datasheet

REV. A
AD974
–4–
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 AD974 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
ABSOLUTE MAXIMUM RATINGS
1
Analog Inputs
VxA, VxB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 V
CAP . . . . . . . . . . . . . . . . +V
ANA
+ 0.3 V to AGND2 – 0.3 V
REF . . . . . . . . . . . . . . . . . . . . Indefinite Short to AGND2,
Momentary Short to V
ANA
Ground Voltage Differences
DGND, AGND1, AGND2 . . . . . . . . . . . . . . . . . . . ±0.3 V
Supply␣ Voltages
V
ANA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
V
DIG
to V
ANA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±7 V
V
DIG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
Digital Inputs . . . . . . . . . . . . . . . . . . . –0.3 V to V
DIG
+ 0.3 V
Internal␣ Power␣ Dissipation
2
PDIP (N), SOIC (R), SSOP (RS) . . . . . . . . . . . . . 700 mW
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature Range N, R . . . . . . . . –65°C to +150°C
Lead Temperature Range
(Soldering␣ 10␣ sec) . . . . . . . . . . . . . . . . . . . . . . . . . .+300°C
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
Specification is for device in free air:
28-Lead PDIP: θ
JA
= 100°C/W, θ
JC
= 31°C/W
28-Lead SOIC: θ
JA
= 75°C/W, θ
JC
= 24°C/W
28-Lead SSOP: θ
JA
= 109°C/W, θ
JC
= 39°C/W
PIN CONFIGURATION
SOIC, DIP AND SSOP
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD974
DGND
EXT/INT
PWRD
V
DIG
R/C
AGND2
REF
AGND1
V3A
V3B
V4A
CAP
BIP
V4B
SYNC
DATACLK
DATA
WR2
WR1
CS
BUSY
V2B
V2A
V1B
V1A
A1
A0
V
ANA
TO OUTPUT
PIN
C
L
100pF
I
OL
+1.4V
I
OH
1.6mA
500mA
Figure 1. Load Circuit for Digital Interface Timing
ORDERING GUIDE
Temperature Package Package
Model Range Max INL Min S/(N+D) Description Options
AD974AN –40°C to +85°C ±3.0 LSB 83 dB 28-Lead Plastic DIP N-28B
AD974BN –40°C to +85°C ±2.0 LSB 85 dB 28-Lead Plastic DIP N-28B
AD974AR –40°C to +85°C ±3.0 LSB 83 dB 28-Lead SOIC R-28
AD974BR –40°C to +85°C ±2.0 LSB 85 dB 28-Lead SOIC R-28
AD974ARS –40°C to +85°C ±3.0 LSB 83 dB 28-Lead SSOP RS-28
AD974BRS –40°C to +85°C ±2.0 LSB 85 dB 28-Lead SSOP RS-28