3-10

Precision Voltage-Controlled Oscillator

The circuit diagram of a precision voltage-controlled oscillator is

shown in Figure 10. The oscillator operates with a tracking error

on the order of 0.02% and a temperature coefficient of

(a CA5130) can swing within about 10mV of either supply-rail,

the output pulse amplitude (V) is essentially equal to V+. The

Voltmeter With High Input Resistance

The voltmeter circuit shown in Figure 11 illustrates an

application in which a number of the CA5160 characteristics are

output circuitry to permit selection of the proper output voltage

for feedback to Terminal 2 via 10k

Ω current-limiting resistor. The

circuit is powered by a single 8.4V mercury battery. With zero

input signal, the circuit consumes somewhat less than 500

µA

plus the meter current required to indicate a given voltage. Thus,

at full-scale input, the total supply current rises to slightly more

than 1500

µA.

0

0

Top Trace: Output

Bottom Trace: Input

FIGURE 7C. OUTPUT-WAVEFORM WITH GROUND-REFERENCE

SINE-WAVE INPUT

FIGURE 7. SINGLE SUPPLY VOLTAGE FOLLOWER WITH

ASSOCIATED WAVEFORMS (e.g., FOR USE IN

SINGLE-SULLPL D/A CONVERTER; SEE FIGURE 9

IN AN6080)

CA3085

1

2

6

3

0.001

µF

4

7

6

13

8

1

5

12

CD4007A

“SWITCHES”

10

3

14

11

2

9

4

7

806K

1%

402K

1%

200K

1%

806K

1%

6

13

8

1

5

12

CD4007A

“SWITCHES”

10

3

100K

1%

(2)

806K

6

13

8

12

CD4007A

“SWITCHES”

10

3

806K

1%

806K

1%

1%

(4)

806K

1%

(8)

806K

1%

1

5

806K

1%

750K

1%

10V LOGIC INPUTS

PARALLELED

RESISTORS

+10.010V

LSB

MSB

9

8

7

654

321

8

+10.010V

22.1K

1%

1K

3.83K

1%

2

µF

25V

+

-

+15V

62

VOLTAGE

REGULATOR

REGULATED

VOLTAGE

ADJUST

CA5160

3

4

2

0.1

µF

+

-

1

5

6

2K

+15V

100K

VOLTAGE

FOLLOWER

7

OFFSET

NULL

OUTPUT

LOAD

10K

BIT

REQUIRED RATIO-

MATCH

1

Standard

2

±0.1%

3

±0.2%

4

±0.4%

5

±0.8%

6 - 9

±1% ABS.

FIGURE 8. 9 BIT DAC USING CMOS DIGITAL SWITCHES AND CA5160

CA5160