OP77 datasheet(14/16 Pages) AD

14 / 16 page

REV. C

OP77

–14–

+15V

–15V

0.1 F

OP77

VIN

100k

VOUT

VTH

1N4148

Figure 17. Precision Threshold Detector/Amplifier

When VIN < VTH, amplifier output swings negative, reverse

biasing diode D1. VOUT = VTH if RL=

• when VIN > VTH, the

loop closes,

OUT

() +

ËÁ

¯˜

–1

CC is selected to smooth the response of the loop.

OP77

REF-02

VIN

GND

TEMP

TRIM

50k

1.5k

Rb1

Rbp

VOUT

–15V

+15V

0.1 F

Figure 18. Precision Temperature Sensor

Table II. Resistor Values

TCVOUT SLOPE (S)

10 mV/

∞C 100 mV/∞C 10 mV/∞F

TEMPERATURE

–55

∞C to

–55

∞C to

–67

∞F to

RANGE

+125

∞C

+125

∞C

+257

∞C

OUTPUT VOLTAGE

–0.55 V to

–5.5 V to

–0.67 V to

RANGE

+1.25 V

+12.5V

+2.57V

ZERO-SCALE

0 V @ 0

∞C0 V @ 0∞C0 V @ 0 F

Ra (

±1% Resistor)

9.09 k

15 k

7.5 k

Rb1 (

±1% Resistor)

1.5 k

1.82 k

1.21 k

Rbp (Potentiometer)

200

500

200

Rc (

±1% Resistor)

5.11 k

84.5 k

8.25 k

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