# APPLICATION BULLETIN

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2 V 1 = Output voltage of circuit at (V = Output voltage of circuit (V = Diode temperature coefficient (V/ C value depends on 25 See table below. = Minimum process temperature ( C δ /δt = Desired output voltage change for given temperature change (V/ C (Note: Must be negative for Figure 1 circuit. AVAILABLE VBE 25 AND VALUES FOR MOTOROLA TEMPERATURE SENSOR 25 (V (V/ C Design a temperature measurement system with a 0 to 1.0V δ /δt = ( 1V 0V/(100 C 0 C = 0.01V/ C If 25 = 0.595V, = 8.424kΩ = 28.77kΩ For a 0 to 10V output with a 0 to 100 C temperature: = 6.667kΩ = 287.7kΩ If independent adjustment of offset and span is required consider the circuit shown in Figure 2. In this circuit, a third resistor, is added in series with the temperaturesensing diode. System zero (offset can be adjusted with without affecting span (gain. To trim the circuit adjust span first. Either or (or both can be used to adjust span. As with the Figure 1 circuit this circuit has the possible disadvantage that the temperature to voltage conversion is inverting. resistor values for the Figure 2 circuit. = ( + (1 + / Set = 1kΩ (or use a 2kΩ pot (δ /δt (25 + ( + ( 25 C ( V 1 = ((δ /δt (δ /δt = ( 1 = Zero (offset adjust resistor (Ω Others = as before Design a temperature measurement system with a 0 to 1.0V δ /δt = ( 1V 0V/(100 C 0 C = 0.01V/ C If 25 = 0.595V, = 1kΩ (use 2kΩ pot = 9.717kΩ = 33.18kΩ For a 0 to 10V output with a 0 to 100 C temperature: = 1kΩ (use 2kΩ pot = 7.69kΩ = 331.8kΩ R Zero 4.5V to 36V = ( + (1 + / = voltage across diode (V Adjust span first with or then adjust zero with for noninteractive trim. Figure 2. Diode-based Temperature Measurement Circuit with Independent Span (gain and Zero (offset Adjustment. R1 2

4 For a 0 to 10V output with a 0 to 100 C temperature: = 6.372kΩ = 10.0kΩ = 441.5kΩ 4.5V to 36V resistor values for the Figure 5 circuit. = ((2 + 2 (1 + 1 GAIN GAIN = / = 2 (δ /δt + 2 A 2 1 = 2 = 500Ω (use 1kΩ pot for = Span (gain adjust resistor [Ω] Others = as before = R ZER O (1 + / / = voltage across diode [V] Adjust span first with or then adjust zero with for noninteractive trim. Figure 4. Single-supply Positive Transfer Function Temperature Measurement Circuit with Independent Span (gain and Zero (offset Adjustment. For differential temperature measurement, use the circuit shown in Figure 5. In this circuit, the differential output between two temperature sensing diodes is amplified by a two-op-amp instrumentation amplifier (IA. The IA is formed from the two op amps in a dual and resistors,, R 4, and. sets the gain of the IA. For good common-mode rejection,,, and R 4 must be matched. If 1% resistors are used, CMR will be greater than 70dB for gains over 50V/V. Span and zero can be adjusted in any order in this circuit. Design a temperature measurement system with a 0 to 1.0V output for a 0 to 1 C temperature differential. δ /δt = (1V 0V/(1 C 0 C = 1.0V/ C If 25 = 0.595V, = 1kΩ pot,, R 4 =, 1% = 455Ω For a 0 to 10V output with a 0 to 1 C temperature differential: = 1kΩ pot,, R 4 =, 1% = 45.3Ω 4

5 4.5V to 36V R 3 R 4 A 2 = ((2 + 2 (1 + 1 GAIN GAIN = R / SPAN Adjust zero and span in any order. Figure 5. Differential Temperature Measurement Circuit. 5

6 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI s publication of information regarding any third party s products or services does not constitute TI s approval, warranty or endorsement thereof. Copyright 2000, Texas Instruments Incorporated

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DESCRIPTION The µa71 is a high performance operational amplifier with high open-loop gain, internal compensation, high common mode range and exceptional temperature stability. The µa71 is short-circuit-protected

### CA723, CA723C. Voltage Regulators Adjustable from 2V to 37V at Output Currents Up to 150mA without External Pass Transistors. Features.

CA73, CA73C Data Sheet April 1999 File Number 788. Voltage Regulators Adjustable from V to 37V at Output Currents Up to 1mA without External Pass Transistors The CA73 and CA73C are silicon monolithic integrated