AD7943/AD7945/AD7948–SPECIFICATIONS
1
NORMAL MODE
Parameter
ACCURACY
Resolution
Relative Accuracy
Differential Nonlinearity
Gain Error
T
MIN
to T
MAX
Gain Temperature Coefficient
4
Output Leakage Current
I
OUT1
@ +25°C
T
MIN
to T
MAX
REFERENCE INPUT
Input Resistance
DIGITAL INPUTS
V
INH
, Input High Voltage
V
INL
, Input Low Voltage
I
INH
, Input Current
C
IN
, Input Capacitance
4
DIGITAL OUTPUT (AD7943 SRO)
Output Low Voltage (V
OL
)
Output High Voltage (V
OH
)
POWER REQUIREMENTS
V
DD
Range
Power Supply Sensitivity
4
∆Gain/∆V
DD
I
DD
(AD7943)
(AD7943: V
DD
= +4.5 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 0 V; V
REF
= +10 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted.
AD7945, AD7948: V
DD
= +4.5 V to +5.5 V; V
IOUT1
= AGND = 0 V; V
REF
= +10 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
B Grades
2
T Grade
2, 3
12
±
0.5
±
0.5
±
2
2
5
12
±
0.5
±
0.5
±
2
2
5
Units
Bits
LSB max
LSB max
Test Conditions/Comments
1 LSB = V
REF
/2
12
= 2.44 mV when V
REF
= 10 V
All Grades Guaranteed Monotonic over
Temperature
LSB max
ppm FSR/°C typ
ppm FSR/°C max
10
100
6
12
2.4
0.8
±
1
10
0.2
V
DD
– 0.2
4.5/5.5
–75
5
10
100
6
12
2.4
0.8
±
1
10
0.2
V
DD
– 0.2
4.5/5.5
–75
5
nA max
nA max
kΩ min
kΩ max
V min
V max
µA
max
pF max
See Terminology Section
Typically 20 nA over Temperature
Typical Input Resistance = 9 kΩ
For 1 CMOS Load
V max
V min
V min/V max
dB typ
µA
max
I
DD
(AD7945, AD7948)
5
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 a 1 MHz STB
Frequency. At Input Levels of 0.8 V and 2.4 V,
I
DD
Is Typically 2.5 mA.
V
INH
= V
DD
– 0.1 V min, V
INL
= 0.1 V max.
Typically 1
µA.
At Input Levels of 0.8 V and
2.4 V, I
DD
Is Typically 2.5 mA.
NOTES
1
The AD7943, AD7945 and AD7948 are specified in the normal current mode configuration and in the biased current mode for single-supply applications.
Figures 14 and 15 are examples of normal mode operation.
2
Temperature ranges as follows: B Grades: –40°C to +85°C; T Grade: –55°C to +125°C.
3
The T Grade applies to the AD7945 only.
4
Guaranteed by design.
Specifications subject to change without notice.
–2–
REV. B
AD [ ANALOG DEVICES ]
