Datasheet

–2–
AD7841–SPECIFICATIONS
(V
CC
= 5 V  5%; V
DD
= 15 V  10%; V
SS
= –15 V  10%; GND = DUTGND =
0 V; R
L
= 5 k and C
L
= 50 pF to GND, T
A
1
= T
MIN
to T
MAX
, unless otherwise noted)
Parameter A B Unit Test Conditions/Comments
ACCURACY
Resolution 14 14 Bits
Relative Accuracy ±4 ±2 LSB max
Differential Nonlinearity –0.9/2 ±1 LSB max Guaranteed Monotonic Over Temperature for All
Grades
Zero-Scale Error ±8 ±8 LSB max V
REF
(+) = +5 V, V
REF
(–) = –5 V. Typically within
±2 LSB
Full-Scale Error ±8 ±8 LSB max V
REF
(+) = +5 V, V
REF
(–) = –5 V. Typically within
±2 LSB
Gain Error ±2 ±2 LSB typ V
REF
(+) = +5 V, V
REF
(–) = –5 V
Gain Temperature Coefficient
2
0.5 0.5 ppm FSR/°C typ
10 10 ppm FSR/°C max
DC Crosstalk
2
120 120 µV max See Terminology. Typically 75 µV
REFERENCE INPUTS
2
DC Input Impedance 100 100 MΩ typ
Input Current ±1 ±1 µA max Per Input. Typically ±0.03 µA
V
REF
(+) Range 0/5 0/5 V min/max
V
REF
(–) Range –5/0 –5/0 V min/max
[V
REF
(+) – V
REF
(–)] 2/10 2/10 V min/max For Specified Performance. Can Go as Low as 0 V,
but Performance Not Guaranteed
DUTGND INPUTS
2
DC Input Impedance 60 60 kΩ typ
Max Input Current ±0.3 ±0.3 mA typ Per Input
Input Range
3
–2/+2 –2/+2 V min/max
OUTPUT CHARACTERISTICS
2
Output Voltage Swing V
SS
+ 2.5 V to V
SS
+ 2.5 V to V typ V
OUT
= 2 × (V
REF
(–) + [V
REF
(+) – V
REF
(–)] × D)
V
DD
– 2.5 V V
DD
– 2.5 V – V
DUTGND
Short Circuit Current 15 15 mA max
Resistive Load 5 5 kΩ min To 0 V
Capacitive Load 50 50 pF max To 0 V
DC Output Impedance 0.5 0.5 Ω max
DIGITAL INPUTS
2
V
INH
, Input High Voltage 2.4 2.4 V min
V
INL
, Input Low Voltage 0.8 0.8 V max
I
INH
, Input Current Total for All Pins
@ 25°C ±1 ±1 µA max
T
MIN
to T
MAX
±10 ±10 µA max
C
IN
, Input Capacitance 10 10 pF max
POWER REQUIREMENTS
4
V
CC
4.75/+5.25 4.75/+5.25 V min/max For Specified Performance
V
DD
15 V ± 10% 15 V ± 10% V min/max For Specified Performance
V
SS
–15 V ± 10% –15 V ± 10% V min/max For Specified Performance
Power Supply Sensitivity
2
∆Full Scale/∆V
DD
90 90 dB typ
∆Full Scale/∆V
SS
90 90 dB typ
I
CC
0.5 0.5 mA max V
INH
= V
CC
, V
INL
= GND. Dynamic Current
I
DD
10 10 mA max Outputs Unloaded. Typically 8 mA
I
SS
10 10 mA max Outputs Unloaded. Typically 8 mA
NOTES
1
Temperature range for A and B Versions: –40°C to +85°C.
2
Guaranteed by characterization. Not production tested.
3
See DUTGND Voltage Range section.
4
The AD7841 is functional with power supplies of ± 12 V ±10% with reduced output range. Output amplifier requires 2.5 V of head room at the bottom and top ends
of the transfer for function. At 12 V supplies it is recommended to restrict the reference range to ± 4 V.
Specifications subject to change without notice.
REV. B