Datasheet ADR1581 (Analog Devices) - 7

link to page 5 link to page 7 link to page 7 link to page 7 link to page 7
ADR1581 1.2508 600 (VMAX – VO) 1.2506 SLOPE = TC =(+85°C – +25°C) × 1.250V × 10–6 ) 500 1.2504 VMAX m p ) p V ( 1.2502 E R ( 400 G O A 1.2500 V RR LT O E O 1.2498 T 300 F V T RI U 1.2496 D P T AL 200 OU 1.2494 IDU (V S 1.2492 SLOPE = TC = MIN – VO) RE (–40°C – +25°C) × 1.250V × 10–6 100 1.2490 VMIN 1.2488 0
2 3
–55 –35 –15 5 25 45 65 85 105 125
-01
–55 –35 –15 5 25 45 65 85 105 125
01 72 2-
TEMPERATURE (°C)
67 066
TEMPERATURE (°C)
06 Figure 12. Output Voltage vs. Temperature Figure 13. Residual Drift Error For example, the ADR1581BRT initial tolerance is ±1.5 mV;
REVERSE VOLTAGE HYSTERESIS
a ±50 ppm/°C temperature coefficient corresponds to an error A major requirement for high performance industrial band of ±4.1 mV (50 × 10−6 × 1.250 V × 65°C). Therefore, the equipment manufacturers is a consistent output voltage at unit is guaranteed to be 1.250 V ± 5.6 mV over the operating nominal temperature following operation over the operating temperature range. temperature range. This characteristic is generated by measuring the difference between the output voltage at +25°C after operating Duplication of these results requires a combination of high at +85°C and the output voltage at +25°C after operating at −40°C. accuracy and stable temperature control in a test system. Evaluation of the ADR1581 produces curves similar to those in Figure 14 displays the hysteresis associated with the ADR1581. Figure 4 This characteristic exists in all references and has been minimized and Figure 12. in the ADR1581.
VOLTAGE OUTPUT NONLINEARITY VS. 40 TEMPERATURE 35
When a reference is used with data converters, it is important to
30
understand how temperature drift affects the overall converter performance. The nonlinearity of the reference output drift
25 ITY
represents additional error that is not easily calibrated out of the
T N 20
system. The usual way of showing the reference output drift is to
A QU
plot the reference voltage vs. temperature (see Figure 12). An
15
alternative method is to draw a straight line between the
10
temperature endpoints and measure the deviation of the output
5
from the straight line. This shows the same data in a different format. This characteristic (see Figure 13) is generated by
0 –400 –300 –200 –100 0 100 200 300 400
14 0 2- normalizing the measured drift characteristic to the endpoint
HYSTERESIS VOLTAGE (µV)
67 06 average drift. The residual drift error of approximately 500 ppm Figure 14. Reverse Voltage Hysteresis Distribution shows that the ADR1581 is compatible with systems that require 10-bit accurate temperature performance. Rev. 0 | Page 7 of 12 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PIN CONFIGURATION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLYING THE ADR1581 TEMPERATURE PERFORMANCE VOLTAGE OUTPUT NONLINEARITY VS. TEMPERATURE REVERSE VOLTAGE HYSTERESIS OUTPUT IMPEDANCE VS. FREQUENCY NOISE PERFORMANCE AND REDUCTION TURN-ON TIME TRANSIENT RESPONSE PRECISION MICROPOWER LOW DROPOUT REFERENCE USING THE ADR1581 WITH 3 V DATA CONVERTERS OUTLINE DIMENSIONS ORDERING GUIDE