CA5160 datasheet(10/18 Pages) INTERSIL

Il numero della parte	CA5160

Spiegazioni elettronici	4MHz, BiMOS Microprocessor Operational Amplifiers with MOSFET Input/CMOS Output

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Produttore elettronici	INTERSIL [Intersil Corporation]

Homepage	http://www.intersil.com/cda/home

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10 / 18 page

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

0.01%/oC. A multivibrator (A1) generates pulses of constant

amplitude (V) and width (T2). Since the output (Terminal 6) of A1

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

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

average output voltage (EAVG =V T2/T1) is applied to the non-

inverting input terminal of comparator A2 (a CA5160) via an

integrating network R3, C2. Comparator A2 operates to establish

circuit conditions such that EAVG = V1. This circuit condition is

accomplished by feeding an output signal from Terminal 6 of A2

through R4, D4 to the inverting terminal (Terminal 2) of A1,

thereby adjusting the multivibrator interval, T3.

Voltmeter With High Input Resistance

The voltmeter circuit shown in Figure 11 illustrates an

application in which a number of the CA5160 characteristics are

exploited. Range-switch SW1 is ganged between input and

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

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%

(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

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