REF02

Rev. F | Page 10 of 16

OUTPUT ADJUSTMENT

The REF02 trim terminal can be used to adjust the output

voltage over a 5 V ±300 mV range. This feature lets the system

designer trim system errors by setting the reference to a voltage

other than 5 V. The output also can be set to exactly 5.000 V or

to 5.12 V for binary applications.

GND

TRIM

TEMP

REF02

15V

3

2

6

5

4

OUTPUT

10k

Ω

Figure 14. Output Adjustment Circuit

temperature performance of the device. The temperature

coefficient change is approximately 0.7 ppm/°C for 100 m

V of

output adjustment.

GND

–18V

+18V

4

2

REF02

Figure 15. Burn-In Circuit

GND

REF02

TRIM

TEMP

0.1

µF

5k

Ω

OP02

10k

Ω

10k

Ω

+15V

–15V

+15V

+5V

–5V

4

5

3

6

2

Figure 16. ±5 V Reference

REF02

R1

5.6k

Ω

R2

5.6k

Ω

2

+5V

4

6

2

OP02

–

+

3

4

6

7

–9V

+2.5V

–2.5V

Figure 17. ±2.5 V Reference

TEMPERATURE MONITORING

As described previously, the REF02 provides a TEMP output

(Pin 3) that varies linearly with temperature. This output can be

used to monitor the temperature change in the system. The

temperature coefficient is approximately 1.96 mV/°C (see

Figure 18).

850

800

750

700

650

600

550

500

450

400

–50

–25

0

25

50

75

100

125

TEMPERATURE (

°C)

SAMPLE SIZE = 6

J, S, AND P PACKAGES

Z PACKAGE AND 833 PRODUCT

Figure 18. Voltage at TEMP Pin vs. Temperature

A voltage change of 39.2 mV at the TEMP pin corresponds to a

20°C change in temperature.

The TEMP function is provided as a convenience rather than a

precise feature. Since the voltage at the TEMP node is acquired

from the band gap core, current pulling from this pin will have

TEMP output with a suitable low bias current op amp, such as

the AD8601, AD820, or OP1177 (all of which would result in

buffering, even tens of microamps drawn from the TEMP pin