AD7943/AD7945/AD7948
SPECIFICATIONS
1
BIASED MODE
Parameter
ACCURACY
Resolution
Relative Accuracy
Differential Nonlinearity
Gain Error @ +25°C
T
MIN
to T
MAX
Gain Temperature Coefficient
3
Output Leakage Current
I
OUT1
@ +25°C
T
MIN
to T
MAX
Input Resistance
@ I
OUT2
Pin (AD7943)
@ AGND Pin (AD7945, AD7948)
DIGITAL INPUTS
V
INH
, Input High Voltage @ V
DD
= +5 V
V
INH
, Input High Voltage @ V
DD
= +3.3 V
V
INL
, Input Low Voltage @ V
DD
= +5 V
V
INL
, Input Low Voltage @ V
DD
= +3.3 V
I
INH
, Input Current
C
IN
, Input Capacitance
3
DIGITAL OUTPUT (SRO)
Output Low Voltage (V
OL
)
Output High Voltage (V
OH
)
POWER REQUIREMENTS
V
DD
Range
Power Supply Sensitivity
3
∆Gain/∆V
DD
I
DD
(AD7943)
(AD7943: V
DD
= +3 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 1.23 V; V
REF
= +0 V to 2.45 V; T
A
= T
MIN
to T
MAX
, unless other-
wise noted. AD7945, AD7948: V
DD
= +3 V to +5.5 V; V
IOUT1
= AGND = 1.23 V; V
REF
= +0 V to 2.45 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
A Grades
2
Units
12
±
1
±
0.9
±
3
±
4
2
5
Bits
LSB max
LSB max
LSB max
LSB max
ppm FSR/°C typ
ppm FSR/°C max
See Terminology Section
10
100
6
6
2.4
2.1
0.8
0.6
±
1
10
0.2
V
DD
– 0.2
3.0/5.5
–75
5
nA max
nA max
kΩ min
kΩ min
V min
V min
V max
V max
µA
max
pF max
For 1 CMOS Load
V max
V min
V min/V max
dB typ
µA
max
Test Conditions/Comments
1 LSB = (V
IOUT1
– V
REF)
/2
12
= 300
µV
When
V
IOUT1
= 1.23 V and V
REF
= 0 V
All Grades Guaranteed Monotonic
over Temperature
Typically 20 nA over Temperature
This Varies with DAC Input Code
I
DD
(AD7945, AD7948)
5
µA
max
V
INH
= V
DD
– 0.1 V min, V
INL
= 0.1 V max.
SRO Open Circuit; No STB Signal; Typically
1
µA.
Typically 100
µA
with 1 MHz STB
Frequency.
V
INH
= V
DD
– 0.1 V min, V
INL
= 0.1 V max.
Typically 1
µA.
NOTES
1
These specifications apply with the devices biased up at 1.23 V for single supply applications. The model numbering reflects this by means of a “–B” suffix
(for example: AD7943AN-B). Figure 16 is an example of Biased Mode Operation.
2
Temperature ranges as follows: A Versions: –40°C to +85°C.
3
Guaranteed by design.
Specifications subject to change without notice.
REV. B
–3–
AD [ ANALOG DEVICES ]
