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ICL7136CM44Z Datasheet(PDF) 11 Page - Intersil Corporation |
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ICL7136CM44Z Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN3086.6 July 21, 2005 Reference Voltage The analog input required to generate full scale output (2000 counts) is: VlN = 2VREF. Thus, for the 200mV and 2V scale, VREF should equal 100mV and 1V, respectively. However, in many applications where the A/D is connected to a transducer, there will exist a scale factor other than unity between the input voltage and the digital reading. For instance, in a weighing system, the designer might like to have a full scale reading when the voltage from the transducer is 0.662V. Instead of dividing the input down to 200mV, the designer should use the input voltage directly and select VREF = 0.341V. Suitable values for integrating resistor and capacitor would be 330k Ω and 0.047µF. This makes the system slightly quieter and also avoids a divider network on the input. Another advantage of this system occurs when a digital reading of zero is desired for VIN ≠ 0. Temperature and weighing systems with a variable fare are examples. This offset reading can be conveniently generated by connecting the voltage transducer between IN HI and COMMON and the variable (or fixed) offset voltage between COMMON and IN LO. Typical Applications The ICL7136 may be used in a wide variety of configurations. The circuits which follow show some of the possibilities, and serve to illustrate the exceptional versatility of these A/D converters. The following application notes contain very useful information on understanding and applying this part and are available from Intersil. Application Notes NOTE # DESCRIPTION AN016 “Selecting A/D Converters” AN017 “The Integrating A/D Converter” AN018 “Do’s and Don’ts of Applying A/D Converters” AN023 “Low Cost Digital Panel Meter Designs” AN032 “Understanding the Auto-Zero and Common Mode Performance of the ICL7136/7/9 Family” AN046 “Building a Battery-Operated Auto Ranging DVM with the ICL7106” AN052 “Tips for Using Single Chip 31/2 Digit A/D Converters” FIGURE 8. ICL7136 USING THE INTERNAL REFERENCE FIGURE 9. RECOMMENDED COMPONENT VALUES FOR 2V FULL SCALE 28 40 39 38 37 36 35 34 33 32 31 30 29 27 26 25 24 23 22 21 OSC 1 OSC 2 OSC 3 TEST REF HI REF LO CREF CREF COMMON IN HI IN LO A-Z BUFF INT V - G2 C3 A3 G3 BP 50pF TO PIN 1 SET VREF = 100mV 0.1 µF 0.01 µF 1M Ω 180k Ω 20k Ω 240k Ω IN + - 9V 180k Ω 0.047 µF 0.47 µF TO BACKPLANE TO DISPLAY Values shown are for 200mV full scale, 3 readings/sec., floating supply voltage (9V battery). + - 28 40 39 38 37 36 35 34 33 32 31 30 29 27 26 25 24 23 22 21 OSC 1 OSC 2 OSC 3 TEST REF HI REF LO CREF CREF COMMON IN HI IN LO A-Z BUFF INT V - G2 C3 A3 G3 BP/GND 50pF TO PIN 1 SET VREF = 100mV 0.1 µF 0.01 µF 1M Ω 180k Ω 250k Ω 240kΩ IN + - 1.8M 0.047 µF 0.01 µF TO DISPLAY V+ V- ICL7136 |
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