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AD590IH 数据表(PDF) 7 Page - Intersil Corporation |
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AD590IH 数据表(HTML) 7 Page - Intersil Corporation |
7 / 10 page 12-9 ALL values are in k Ω. The ICL7106 has a VIN span of ±2.0V and a VCM range of (V+ -0.5V) to (V- +1V). R is scaled to bring each range within VCM while not exceeding VIN. VREF for both scales is 500mV maximum rending on the celsius range 199.9oC limited by the (short-term) maximum allowable sensor tem- perature. Maximum reading on the fahrenheit range is 199.9oF (93.3oC) limited by the number of display digits. See Figure 11 and notes below. The Kelvin scale version reads from 0 to 1999oK theoretically, and from 223oK to 473oK actually. The 2.26k Ω resistor brings the input within the ICL7106 VCM range: 2 general-purpose silicon diodes or an LED may be substi- tuted. See Figure 12 and notes below. This circuit allows “zero adjustment” as well as slope adjustment. the ICL8069 brings the input within the com- mon-mode range, while the 5k Ω pots trim any offset at 218oK (-55oC), and set the scale factor. See Figure 13 and notes below. Notes for Figure 11, Figure 12 and Figure 13 Since all 3 scales have narrow VlN spans, some optimization of ICL7106 components can be made to lower noise and preserve CMR. The table below shows the suggested val- ues. Similar scaling can be used with the ICL7126 and ICL7136. RR1 R2 R3 R4 R5 oF 9.00 4.02 2.0 12.4 10.0 0 oC 5.00 4.02 2.0 5.11 5.0 11.8 V+ REF HI REF LO ICL7106 IN HI COMMON IN LO R1 R + - V - R2 R3 R4 R5 AD590 FIGURE 11. BASIC DIGITAL THERMOMETER, CELSIUS AND FAHRENHEIT SCALES R n n1 = 5 ∑ 28k Ω = nominal V+ 7.5k Ω 2.26k Ω + - V - 5k Ω 15k Ω 1.00k Ω AD590 SCALE ADJ REF HI REF LO ICL7106 IN HI COMMON IN LO FIGURE 12. BASIC DIGITAL THERMOMETER, KELVIN SCALE SCALE VlN RANGE (V) RlNT (kΩ)CAZ (µF) K 0.223 to 0.473 220 0.47 C -0.25 to +1.0 220 0.1 F -0.29 to +0.996 220 0.1 For all: CREF = 0.1µF ClNT = 0.22µF COSC =100pF ROSC = 100kΩ V+ 7.5k Ω 1k Ω + - V - 5k Ω 15k Ω AD590 SCALE ADJ 0.1% 1.000V 12k Ω ZERO ADJ 26.1k Ω 5k Ω 402 Ω ICL8069 1.235V REF HI REF LO ICL7106 IN HI COMMON IN LO FIGURE 13. BASIC DIGITAL THERMOMETER, KELVIN SCALE WITH ZERO ADJUST AD590 |
类似零件编号 - AD590IH |
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类似说明 - AD590IH |
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