Os motores de busca de Datasheet de Componentes eletrônicos |
|
AD537SH Folha de dados(PDF) 8 Page - Analog Devices |
|
AD537SH Folha de dados(HTML) 8 Page - Analog Devices |
8 / 8 page AD537 REV. C –8– THERMOCOUPLE INPUT The output of a Chromel-Constantan (Type E) thermocouple, using a reference junction at 0 °C, varies from 0 mV to 53.14 mV over the temperature range 0 °C to +700°C with a slope of 80.678 µV/degree over most of its range and some nonlinearity over the range 0 °C to +200°C. For this example, we assume that it is desired to indicate temperature in Degrees Celsius using a counter/display with a 100 ms gate width. Thus, the V-F converter must deliver an output of 7 kHz for an input of 53.14 mV. If very precise operation down to 0 °C is imperative, some sort of linearizing is necessary (see, for example, Analog Devices’ Nonlinear Circuits Handbook, pp. 92–97) but in many cases operation is only needed over part of the range. The circuit shown in Figure 14 provides good accuracy from +300 °C to +700°C. The extrapolation of the temperature volt- age curve back to 0 °C shows that an offset of –3.34 mV is required to fit the curve most exactly. This small amount of voltage can be introduced without an additional calibration step using the +1.00 V output of the AD537. To adjust the scale, the thermocouple should be raised to a known reference tempera- ture near 500 °C and the frequency adjusted to value using R1. The error should be within ±0.2% over the range 400°C to 700 °C. 1 2 14 13 5 6 7 10 9 8 3 4 12 11 AD537 +5V VLOGIC 10Hz/ °C 0.005µF 47k IOFFSET ≈ 21µA 120 R1 SCALE 50 TMEAS TREF (0 °C) 0 TO 53mV BUF DRIVER CURR- TO-FREQ CONV PRECISION VOLTAGE REFERENCE VT VR 360µA FS Figure 14. Thermocouple Interface with First-Order Linearization OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Side-Brazed Ceramic DIP (TO–116) (D–14) PIN 1 0.310 (7.87) 0.220 (5.59) 0.098 (2.49) MAX 0.005 (0.13) MIN 8 7 14 1 0.200 (5.08) MAX 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.014 (0.36) 0.070 (1.78) 0.030 (0.76) 0.100 (2.54) BSC 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) MIN SEATING PLANE 0.785 (19.94) MAX 0.320 (8.13) 0.290 (7.37) 0.015 (0.38) 0.008 (0.20) 10-Lead Metal Can (TO-100) (H-10A) 36 ° BSC 0.034 (0.86) 0.028 (0.71) 0.045 (1.14) 0.029 (0.74) 0.115 (2.92) BSC 0.230 (5.84) BSC 6 8 57 1 4 2 39 10 REFERENCE PLANE BASE & SEATING PLANE 0.355 (9.02) 0.305 (7.75) 0.370 (9.40) 0.335 (8.51) 0.562 (14.30) 0.500 (12.70) 0.040 (1.01) 0.010 (0.25) 0.050 (1.27) MAX 0.019 (0.48) 0.016 (0.41) 0.021 (0.53) 0.016 (0.41) 0.185 (4.70) 0.165 (4.19) 0.044 (1.12) 0.032 (0.81) |
Nº de peça semelhante - AD537SH |
|
Descrição semelhante - AD537SH |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |