データシートサーチシステム |
|
AD588 データシート(PDF) 7 Page - Analog Devices |
|
AD588 データシート(HTML) 7 Page - Analog Devices |
7 / 12 page REV. D AD588 –7– 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 60 ms (see Figure 6). Note: If the NOISE REDUCTION feature is used in the ±5 V configuration, a 39 k Ω resistor between Pin 6 and Pin 2 is required for proper startup. Figure 6. Turn-On with CN = 1 F TEMPERATURE PERFORMANCE The AD588 is designed for precision reference applications where temperature performance is critical. Extensive tempera- ture testing ensures that the device’s high level of performance is maintained over the operating temperature range. Figure 7 shows typical output voltage drift for the AD588BD and illustrates the test methodology. The box in Figure 7 is bounded on the sides by the operating temperature extremes and on top and bottom by the maximum and minimum output voltages measured over the operating temperature range. The slope of the diagonal drawn from the lower left corner of the box determines the performance grade of the device. OUTPUT VOLTS 10.002 VMAX VMIN 10.000 –35 –15 5 25 45 65 Tmin Tmax TEMPERATURE – C 85 10.001 Figure 7. Typical AD588BD Temperature Drift Each AD588A and B grade unit is tested at –25 °C, 0°C, +25°C, +50 °C, +70°C, and +85°C. This approach ensures that the variations of output voltage that occur as the temperature changes within the specified range will be contained within a box whose diagonal has a slope equal to the maximum specified drift. The position of the box on the vertical scale will change from device to device as initial error and the shape of the curve vary. Maxi- mum height of the box for the appropriate temperature range is shown in Figure 8. Duplication of these results requires a combi- nation of high accuracy and stable temperature control in a test system. Evaluation of the AD588 will produce a curve similar to that in Figure 7, but output readings may vary depending on the test methods and equipment utilized. 2.10 1.05 1.40(typ) 1.05 3.30 10.80 7.20 AD588JQ AD588JQ AD588JQ AD588JQ AD588JQ AD588JQ 3.30 DEVICE GRADE MAXIMUM OUTPUT CHANGE – mV 0 C TO +70 C –25 C TO +85 C –55 C TO +125 C Figure 8. Maximum Output Change—mV KELVIN CONNECTIONS Force and sense connections, also referred to as Kelvin connec- tions, offer a convenient method of eliminating the effects of voltage drops in circuit wires. As seen in Figure 9, the load current and wire resistance produce an error (VERROR = R × I L) at the load. The Kelvin connection of Figure 9 overcomes the problem by including the wire resistance within the forcing loop of the amplifier and sensing the load voltage. The amplifier corrects for any errors in the load voltage. In the circuit shown, the output of the amplifier would actually be at 10 V + VERROR and the voltage at the load would be the desired 10 V. The AD588 has three amplifiers that can be used to implement Kelvin connections. Amplifier A2 is dedicated to the ground force-sense function, while uncommitted amplifiers A3 and A4 are free for other force-sense chores. – + 10V R IL V = 10V – RIL RLOAD R R IL RLOAD V = 10V + RIL V = 10V I = 0 I = 0 Figure 9. Advantage of Kelvin Connection In some single-output applications, one amplifier may be unused. In such cases, the unused amplifier should be connected as a unity-gain follower (force + sense pin tied together), and the input should be connected to ground. An unused amplifier section may be used for other circuit functions as well. Figures 10 through 14 show the typical performance of A3 and A4. FREQUENCY – Hz 100 –20 10 10M 100 1k 10k 100k 1M 80 60 40 20 0 GAIN PHASE 0 –180 –30 –60 –90 –120 –150 Figure 10. Open-Loop Frequency Response (A3, A4) SLOPE T.C. = V– V (T – T ) 10 1 MAX MIN MAX MIN –6 = ×× 10.0013V 10.00025V (85 C –25 C) 10 10 –6 − °− ° × × =° 0.95ppm / C |
同様の部品番号 - AD588 |
|
同様の説明 - AD588 |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |