Datasheet AD587 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | High Precision 10 V Reference |
| Páginas / Página | 12 / 7 — AD587. TURN-ON TIME. 10V. 100ms. +VIN. 100. VOUT 10. DYNAMIC PERFORMANCE. … |
| Revisión | H |
| Formato / tamaño de archivo | PDF / 363 Kb |
| Idioma del documento | Inglés |
AD587. TURN-ON TIME. 10V. 100ms. +VIN. 100. VOUT 10. DYNAMIC PERFORMANCE. 1mV. VOUT. 7.0V. 1kΩ. 20µs. 20V. 1ms. +VIN 100. 50mV. 1µs. VL 100. OUT
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AD587 TURN-ON TIME 10V 1V 100ms
Upon application of power (cold start), the time required for
+VIN
the output voltage to reach its final value within a specified
100 90
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. These figures show the settling
VOUT 10
to be about 60 μs to 0.01%. Note the absence of any thermal tails
0%
when the horizontal scale is expanded to 1 ms/cm in Figure 8. 9 00 0- Output turn-on time is modified when an external noise reduc- 53 00 tion capacitor is used. When present, this capacitor acts as an Figure 9. Turn-On with 1 μF CN additional load to the current source of the internal Zener
DYNAMIC PERFORMANCE
diode, resulting in a somewhat longer turn-on time. In the case of a 1 μF capacitor, the initial turn-on time is approximately The output buffer amplifier is designed to provide the AD587 400 ms to 0.01%, as shown in Figure 9. with static and dynamic load regulation that is superior to less complete references.
10V 1mV
Many ADCs and DACs present transient current loads to the
+VIN
reference, and poor reference response can degrade the con-
100 90
verter’s performance. Figure 11 and Figure 12 display the characteristics of the AD587
VOUT
output amplifier driving a 0 mA to 10 mA load.
10 VOUT 0% 7.0V 1kΩ
7
20µs
-00 0 53 00
V 10V L
Figure 7. Electrical Turn-On
AD587 0V
-010 530 00
20V 10V 1ms
Figure 10. Transient Load Test Circuit
+VIN 100 90 10V 50mV 1µs VOUT VL 100 90 V 10 OUT 0%
08 0
10
30-
0%
05 0 Figure 8. Extended Time Scale 1 1 -0 30 05 0 Figure 11. Large-Scale Transient Response Rev. H | Page 7 of 12 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS THEORY OF OPERATION APPLYING THE AD587 NOISE PERFORMANCE AND REDUCTION TURN-ON TIME DYNAMIC PERFORMANCE LOAD REGULATION TEMPERATURE PERFORMANCE NEGATIVE REFERENCE VOLTAGE FROM AN AD587 APPLICATIONS INFORMATION USING THE AD587 WITH CONVERTERS 10 V Reference with Multiplying CMOS DACs or ADCs Precision Current Source Precision High Current Supply OUTLINE DIMENSIONS ORDERING GUIDE
AD587 TURN-ON TIME 10V 1V 100ms
Upon application of power (cold start), the time required for
+VIN
the output voltage to reach its final value within a specified
100 90
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. These figures show the settling
VOUT 10
to be about 60 μs to 0.01%. Note the absence of any thermal tails
0%
when the horizontal scale is expanded to 1 ms/cm in Figure 8. 9 00 0- Output turn-on time is modified when an external noise reduc- 53 00 tion capacitor is used. When present, this capacitor acts as an Figure 9. Turn-On with 1 μF CN additional load to the current source of the internal Zener
DYNAMIC PERFORMANCE
diode, resulting in a somewhat longer turn-on time. In the case of a 1 μF capacitor, the initial turn-on time is approximately The output buffer amplifier is designed to provide the AD587 400 ms to 0.01%, as shown in Figure 9. with static and dynamic load regulation that is superior to less complete references.
10V 1mV
Many ADCs and DACs present transient current loads to the
+VIN
reference, and poor reference response can degrade the con-
100 90
verter’s performance. Figure 11 and Figure 12 display the characteristics of the AD587
VOUT
output amplifier driving a 0 mA to 10 mA load.
10 VOUT 0% 7.0V 1kΩ
7
20µs
-00 0 53 00
V 10V L
Figure 7. Electrical Turn-On
AD587 0V
-010 530 00
20V 10V 1ms
Figure 10. Transient Load Test Circuit
+VIN 100 90 10V 50mV 1µs VOUT VL 100 90 V 10 OUT 0%
08 0
10
30-
0%
05 0 Figure 8. Extended Time Scale 1 1 -0 30 05 0 Figure 11. Large-Scale Transient Response Rev. H | Page 7 of 12 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS THEORY OF OPERATION APPLYING THE AD587 NOISE PERFORMANCE AND REDUCTION TURN-ON TIME DYNAMIC PERFORMANCE LOAD REGULATION TEMPERATURE PERFORMANCE NEGATIVE REFERENCE VOLTAGE FROM AN AD587 APPLICATIONS INFORMATION USING THE AD587 WITH CONVERTERS 10 V Reference with Multiplying CMOS DACs or ADCs Precision Current Source Precision High Current Supply OUTLINE DIMENSIONS ORDERING GUIDE