CAT660

11

Doc. No. 5000, Rev. U

PRECISION VOLTAGE DIVIDER

A precision voltage divider is shown in figure 9. With very light load currents under 100nA, the voltage at pin 2 will be

within 0.002% of V+/2 . Output voltage accuracy decreases with increasing load.

BATTERY VOLTAGE SPLITTER

Positive and negative voltages that track each other can be obtained from a battery. Figure 10 shows how a 9V battery

can provide symmetrical positive and negative voltages equal to one-half the battery voltage.

Figure 9: Precision Voltage Divider (Load

≤ 100nA)

1

2

3

4

8

7

6

5

+

V+

3V to 11V

+

BOOST/FC

CAP+

GND

CAP-

V+

OSC

LV

OUT

CAT660

+ 0.002%

V+

2

IL < 100nA

Figure 10: Battery Splitter

+

-

(-4.5V)

C2

150

µF

1

2

3

4

8

7

6

5

CAT660

+

C1

150

µF

BOOST/FC

CAP+

GND

CAP-

V+

OSC

LV

OUT

+

(4.5V)

3V < VBAT < 11V

VBAT

9V

BATTERY

VBAT

2

VBAT

2