Datasheet

AD5781 Data Sheet
Rev. D | Page 14 of 28
1.2
1.0
0.8
0.6
0.4
0
0.2
–0.2
–0.4
–0.6
–0.8
–1.0
–55
–35
–15 5
25 45 65
85 105
125
TEMPERATURE (°C)
ZERO-SCALE ERROR (LSBs)
09092-036
AD8676 REFERENCE BUFFERS
AD8675 OUTPUT BUFFER
V
DD
= +15V
V
SS
= –15V
V
REFP
= +10V
V
REFN
= –15V
±10V SPAN
+10V S
PAN
±5V SP
AN
Figure 35. Zero-Scale Error vs. Temperature
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 45 65 85 105
125
TEMPERATURE (°C)
GAIN ERROR (ppm FSR)
09092-037
±10V SPAN
+10V SPAN
+5V SPAN
AD8676 REFERENCE BUFFERS
AD8675 OUTPUT BUFFER
V
DD
= +15V
V
SS
= –15V
V
REFP
= +10V
V
REFN
= –15V
Figure 36. Gain Error vs. Temperature
900
800
700
600
500
400
300
200
100
0
0 1
T
A
= 25°C
2 3
4 5 6
LOGIC INPUT VOLTAGE (V)
IOI
CC
(µA)
09092-038
IOV
CC
= 5V, LOGIC VOLTAGE
INCREASING
IOV
CC
= 5
V, LOGIC VOLT
AGE
DECREASING
IOV
CC
= 3V, LOGIC VO
LTAGE
INCREASING
IOV
CC
= 3V, LOGIC VO
LTAGE
DECREASING
Figure 37. IOI
CC
vs. Logic Input Voltage
5
4
3
2
1
0
–1
–2
–3
–4
–5
–20 –15 –10 –5 0 5 10 15 20
V
DD
, V
SS
(V)
I
DD
, I
SS
(mA)
09092-039
T
A
= 25°C
I
DD
I
SS
Figure 38. Power Supply Currents vs. Power Supply Voltages
09092-040
CH3 5V CH4
5V
200ns
3
4
V
DD
= +15V
V
SS
= –15V
V
REFP
= +10V
V
REFN
= –10V
AD8676 REFERENCE BUFFERS
OUTPUT UNBUFFERED
LOAD = 10MΩ||20pF
Figure 39. Rising Full-Scale Voltage Step
09092-041
CH3 5V
CH4 5V 200ns
3
4
V
DD
= +15V
V
SS
= –15V
V
REFP
= +10V
V
REFN
= –10V
AD8676 REFERENCE BUFFERS
OUTPUT UNBUFFERED
LOAD = 10MΩ||20pF
Figure 40. Falling Full-Scale Voltage Step