OP77 datasheet(14/16 Pages) AD

14 / 16 page

OP77

Data Sheet

Rev. G | Page 14 of 16

+15V

–15V

1kΩ

2kΩ

100kΩ

1N4148

0.1µF

VOUT

VTH

VIN

OP77

Figure 36. Precision Threshold Detector/Amplifier

When VIN < VTH, amplifier output swings negative, reversing the

biasing diode D1. VO = VTH if RL= ∞ when VIN > VTH, the loop

closes,

(

)













−

CC is selected to smooth the response of the loop.

+15V

–15V

Rb1

VIN

GND

TRIM

TEMP

Rbp

1.5kΩ

50kΩ

0.1µF

VOUT

OP77

REF-02

Figure 37. Precision Temperature Sensor

Table 8. Resistor Values

TCVOUT Slope (S)

10 mV/°C

100 mV/°C

10 mV/°F

Temperature Range

−55°C to

+125°C

−55°C to

+125°C

−67°F to

+257°C

Output Voltage

Range

−0.55 V to

+1.25 V

−5.5 V to

+12.5V

−0.67 V to

+2.57V

Zero-Scale

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

OUTPUT

Q19

Q18

Q20

Q16

Q17

Q11 Q12

Q10

Q13

Q27

R2A1

R1A

R2B1

R1B

Q23

Q24

Q21

Q22

Q26

Q25

Q14

Q15

R10

V+

V–

NONINVERTING

INPUT

INVERTING

INPUT

1R2A AND R2B ARE ELECTRONICALLY ADJUSTED ON CHIP AT FACTORY.

(OPTIONAL

NULL)

Figure 38. Simplified Schematic

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