®

REF10

6

affect drift, but the effect of the

∆TCR is reduced by a factor

of 40 by the internal resistor divider. A high quality poten-

tiometer with good mechanical stability, such as a cermet,

should be used. The circuit in Figure 3 has a range of

approximately +250mV to –100mV. The circuit in Figure 4

has less range but provides higher resolution. The mismatch

in TCR between R

some slight drift. This effect is minimized if R

significantly larger than the 156k

Ω internal resistor. A TCR

of 100ppm/

°C is normally sufficient.

FIGURE 3. REF10 Optional Output Voltage Adjust.

FIGURE 4. REF10 Optional Output Voltage Fine Adjust.

APPLICATION INFORMATION

High accuracy, extremely-low drift, and small size make the

REF10 ideal for demanding instrumentation and system

voltage reference applications. Since no heater is required,

low power supply current designs are readily achievable.

Also the REF10 has lower output noise and much faster

warm-up times than heated references, permitting high pre-

cision without extra power or additional supplies. It should

be considered that operating any integrated circuit at an

elevated temperature will reduce its MTTF.

A variety of application circuits are shown in Figures 5

through 11.

V

OUT

REF10

+V

CC

V

TRIM

Minimum range (+2.5%, –1.0%) and minimal degradation of drift.

2

6

5

4

20k

Ω

Output

Voltage

Adjust

+10V

1µF

Tantalum

+

REF10

2

4

R

1k

Ω

6

2

+V

CC

f

= 1.6Hz

1

2

π RC

OPA27

C

100µF

V

FIGURE 5. Precision Reference with Filtering.

FIGURE 6.

±10V Reference.

REF10

2

4

+10V Out

–10V Out

2

1

6

5

3

INA105

+15V

6

FIGURE 7. Positive Precision Current Source.

V

OUT

REF10

V

TRIM

Higher resolution, reduced range.

2

6

5

4

20k

Ω

Output

Voltage

Adjust

+10V

R

S

(1)

1µF

Tantalum

+

+V

CC

See Information in

Typical Performance

Curves

The TCR of R

affect V

is made small.

NOTE: (1) R

REF10

2

4

OPA111

R

I

OUT

6

2

+V

CC

I

, R

≥ 1kΩ

10V

R