OP77Data SheetC+15VC0.1µF+15VRF2100kΩ0.1µFVINRaR6cVROS1kΩD1527TRIM50kΩVTH1N4148R16VREF-022kΩOP77OUTVOP773Rb11.5kΩOUTV3IN4TEMP0.1µF0.1µFGND4Rbp 038 039 –15V–15V 00320- 00320- Figure 36. Precision Threshold Detector/Amplifier Figure 37. Precision Temperature Sensor When VIN < VTH, amplifier output swings negative, reversing the Table 8. Resistor Values biasing diode D1. VO = VTH if RL= ∞ when VIN > VTH, the loop TCVOUT Slope (S)10 mV/°C100 mV/°C 10 mV/°F closes, Temperature Range −55°C to −55°C to −67°F to +125°C +125°C +257°C V = V + (V − R O TH IN V ) F TH 1 + R Output Voltage −0.55 V to −5.5 V to −0.67 V to S Range +1.25 V +12.5V +2.57V CC is selected to smooth the response of the loop. Zero-Scale 0 V @ 0°C 0 V @ 0°C 0 V @ 0°F Ra (±1% Resistor) 9.09 kΩ 15 kΩ 7.5 kΩ Rb1 (±1% Resistor) 1.5 kΩ 1.82 kΩ 1.21 kΩ Rbp (Potentiometer) 200 Ω 500 Ω 200 Ω Rc (±1% Resistor) 5.11 kΩ 84.5 kΩ 8.25 kΩ 7V+R2A1(OPTIONALR2B1R7NULL)C118R1AR1BQ19Q9Q10Q11 Q12R96Q7Q8OUTPUTQ5Q3 Q6Q4C3C2Q17Q27R103Q16R3NONINVERTINGR5Q20INPUTQ1Q26Q21Q232Q15R4Q22Q24Q25INVERTINGQ2Q18INPUTQ14R6R8Q134V– 003 1R2A AND R2B ARE ELECTRONICALLY ADJUSTED ON CHIP AT FACTORY. 00320- Figure 38. Simplified Schematic Rev. G | Page 14 of 16 Document Outline Features Pin Connections General Description Table of Contents Revision History Specifications Electrical Specifications Wafer Test Limits Typical Electrical Characteristics Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Test Circuits Applications Precision Current Sinks Outline Dimensions Ordering Guide