REF102AUSLASH2K5 datasheet(7/19 Pages) TI2

7 / 19 page

REF102

SBVS022B

www.ti.com

OPTIONAL NOISE REDUCTION

The high-frequency noise of the REF102 is dominated by the

zener diode noise. This noise can be greatly reduced by

connecting a capacitor between the Noise Reduction pin and

ground. The capacitor forms a low-pass filter with R6 (refer to

the figure on page 1) and attenuates the high-frequency

noise generated by the zener. Figure 5 shows the effect of a

µF noise reduction capacitor on the high-frequency noise of

the REF102. R6 is typically 7kΩ so the filter has a –3dB

frequency of about 22Hz. The result is a reduction in noise

from about 800

µV

PP to under 200µVPP. If further noise

reduction is required, use the circuit in Figure 14.

APPLICATIONS INFORMATION

High accuracy, extremely low drift, outstanding stability, and

low cost make the REF102 an ideal choice for all instrumen-

tation and system reference applications. Figures 6 through

14 show a variety of useful application circuits.

b) Precision –10V Reference.

a) Resistor Biased –10V Reference

REF102

−10V Out

See SBVA008 for more detail.

V+ (1.4V to 26V)

1.4mA <

< 5.4mA

(5V

−I

10V

OPA227

Ω

1000pF

−10V Out

−15V

REF102

V+ (1.4V to 26V)

FIGURE 6. –10V Reference Using a) Resistor or b) OPA227.

NO C

N = 1µF

FIGURE 5. Effect of 1

µF Noise Reduction Capacitor on

Broadband Noise (f–3dB = 1MHz)

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