AD7628
ABSOLUTE MAXIMUM RATINGS
(T
A
= +25°C unless otherwise noted)
TERMINOLOGY
Relative Accuracy:
V
DD
to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, +17 V
V
DD
to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, +17 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . V
DD
+ 0.3 V
DGND to AGND . . . . . . . . . . . . . . . . . . . . . . . . V
DD
+ 0.3 V
Digital Input Voltage to DGND . . . . . . –0.3 V, V
DD
+ 0.3 V
V
PIN2
, V
PIN20
to AGND . . . . . . . . . . . . . . –0.3 V, V
DD
+ 0.3 V
V
REF
A, V
REF
B to AGND . . . . . . . . . . . . . . . . . . . . . . .
±
25 V
V
RFB
A, V
RFB
B to AGND . . . . . . . . . . . . . . . . . . . . . . .
±
25 V
Power Dissipation (Any Package) to +75°C . . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . 6 mW/°C
Operating Temperature Range
Commercial (K) Grades . . . . . . . . . . . . . . . –40°C to +85°C
Industrial (B) Grades . . . . . . . . . . . . . . . . . –40°C to +85°C
Extended (T) Grades . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
ORDERING GUIDE
Model
1
Relative accuracy or endpoint nonlinearity is a measure of the
maximum deviation from a straight line passing through the
endpoints of the DAC transfer function. It is measured after ad-
justing for zero and full-scale, and is normally expressed in
LSBs or as a percentage of full-scale reading.
Differential Nonlinearity:
Differential nonlinearity is the difference between the measured
change and the ideal 1 LSB change between any two adjacent
codes. A specified differential nonlinearity of
±
1 LSB max over
the operating temperature range ensures monotonicity.
Gain Error:
Gain error is a measure of the output error between an ideal
DAC and the actual device output. It is measured with all 1s in
the DAC latches after offset error has been adjusted out. Gain
error of both DACs is adjustable to zero with external resistance.
Output Capacitance:
Capacitance from OUT A or OUT B to AGND.
Package
Option
2
N-20
P-20A
R-20
Q-20
Q-20
E-20A
Digital-to-Analog Glitch Impulse:
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
–55°C to +125°C
Relative Gain
Accuracy Error
±
1/2 LSB
±
1/2 LSB
±
1/2 LSB
±
1/2 LSB
±
1/2 LSB
±
1/2 LSB
±
2 LSB
±
2 LSB
±
2 LSB
±
2 LSB
±
2 LSB
±
2 LSB
AD7628KN
AD7628KP
AD7628KR
AD7628BQ
AD7628TQ
AD7628TE
The amount of charge injected from the digital inputs to the
analog output when the inputs change state. This is normally
specified as the area of the glitch in either pA-secs or nV-secs,
depending upon whether the glitch is measured as a current or
voltage signal. Glitch impulse is measured with V
REF
A, V
REF
B
= AGND.
Channel-to-Channel Isolation:
NOTES
1
To order MIL-STD-883, Class B process parts, add /883B to part number.
Contact your local sales office for military data sheet.
2
E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip
Carrier; Q = Cerdip; R = SOIC.
The proportion of input signal from one DAC’s reference input
that appears at the output of the other DAC, expressed as a
ratio in dB.
Digital Crosstalk:
The glitch energy transferred to the output of one converter due
to a change in digital input code to the other converter. Speci-
fied in nV secs.
PIN CONFIGURATIONS
DIP, SOIC
RFB A
LCCC
OUT A
OUT B
RFB B
RFB A
AGND
PLCC
OUT A
OUT B
RFB B
18 V
REF
B
17 V
DD
16 WR
15 CS
14 DB0 (LSB)
9
DB5
10 11 12 13
DB4
DB3
DB2
DB1
AGND
1
AGND
OUT A
RFB A
V
REF
A
DGND
DAC A/DAC B
(MSB) DB7
DB6
DB5
1
2
3
4
5
6
7
8
9
20 OUT B
19 RFB B
18 V
REF
B
17 V
DD
V
REF
A 4
DGND 5
DAC A /DAC B 6
DB7 (MSB) 7
DB6 8
3
2
1 20 19
18 V
REF
B
17 V
DD
16 WR
15 CS
14 DB0 (LSB)
3
V
REF
A
DGND
DAC A/DAC B
DB7 (MSB)
DB6
4
5
6
7
8
2
20 19
AD7628
16 WR
AD7628
TOP VIEW
(Not to Scale)
AD7628
TOP VIEW
(Not to Scale)
TOP VIEW
(Not to Scale) 15 CS
14 DB0 (LSB)
13 DB1
DB5
DB4 10
11 DB3
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 AD7628 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.
DB4
DB3
DB2
DB1
12 DB2
9
10 11 12 13
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
AD [ ANALOG DEVICES ]
