OP77 datasheet(14/16 Pages) AD

14 / 16 page

OP77

Rev. E | Page 14 of 16

+15V

–15V

Ω

100k

Ω

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,

()

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

+15V

–15V

Rb1

VIN

GND

TRIM

TEMP

Rbp

1.5k

Ω

50k

Ω

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

is selected to smooth the response of the loop.

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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