AD587KQ Analog Devices Inc, AD587KQ Datasheet - Page 7

• Manufacturer Part Number: AD587KQ
• Manufacturer: Analog Devices Inc

Specifications of AD587KQ

• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 10V
• Temperature Coefficient: 10ppm/°C
• Reference Voltage Accuracy (max): 5
• Line Regulation: 100uV/V
• Load Regulation: 100uV/mA
• Input Voltage (max): 36V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 8
• Package Type: CDIP
• Lead Free Status / Rohs Status: Not Compliant

TURN-ON TIME
Upon application of power (cold start), the time required for
the output voltage to reach its final value within a specified
error band is defined as the turn-on settling time. Two compo-
nents normally associated with this are the time for the active
circuits to settle and the time for the thermal gradients on the
chip to stabilize. Figure 7, Figure 8, and Figure 9 show the turn-
on characteristics of the AD587. It shows the settling to be
about 60 µs to 0.01%. Note the absence of any thermal tails
when the horizontal scale is expanded to 1 ms/cm in Figure 8.
Output turn-on time is modified when an external noise reduc-
tion capacitor is used. When present, this capacitor acts as an
additional load to the internal Zener diode’s current source,
resulting in a somewhat longer turn-on time. In the case of a
1 µF capacitor, the initial turn-on time is approximately 400 ms
to 0.01%, as shown in Figure 9.
V
V
OUT
OUT
V
V
IN
IN
100
100
0%
0%
90
10
90
10
20V
10V
Figure 8. Extended Time Scale
Figure 7. Electrical Turn-On
10V
1mV
1ms
20µs
Rev. G | Page 7 of 12
DYNAMIC PERFORMANCE
The output buffer amplifier is designed to provide the AD587
with static and dynamic load regulation superior to less com-
plete references.
Many ADCs and DACs present transient current loads to the
reference, and poor reference response can degrade the con-
verter’s performance.
Figure 11 and Figure 12 display the characteristics of the AD587
output amplifier driving a 0 mA to 10 mA load.
V
V
OUT
OUT
V
V
IN
L
100
100
0%
0%
90
10
90
10
10V
10V
Figure 11. Large-Scale Transient Response
7.0V
Figure 10. Transient Load Test Circuit
Figure 9. Turn-On with 1µ CN
50mV
1V
AD587
V
L
1kΩ
10V
0V
1µs
100ms
V
OUT
AD587