CA5160E datasheet(8/18 Pages) INTERSIL

Teilenummer	CA5160E

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

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Hersteller	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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3-8

Wideband Noise

From the standpoint of low-noise performance consider-

ations, the use of the CA5160 is most advantageous in appli-

cations where in the source resistance of the input signal is

on the order of 1M

Ω or more. In this case, the total input-

referred noise voltage is typically only 40

µV when the test-

circuit ampliﬁer of Figure 5 is operated at a total supply volt-

age of 15V. This value of total input-referred noise remains

essentially constant, even though the value of source resis-

tance is raised by an order of magnitude. This characteristic

is due to the fact that reactance of the input capacitance

becomes a signiﬁcant factor in shunting the source resis-

tance. It should be noted, however, that for values of source

resistance very much greater than 1M

Ω, the total noise volt-

age generated can be dominated by the thermal noise con-

tributions of both the feedback and source resistors.

Typical Applications

Voltage Followers

Operational ampliﬁers with very high input resistances, like

the CA5160, are particularly suited to service as voltage

followers. Figure 6 shows the circuit of a classical voltage

follower, together with pertinent waveforms using the

CA5160 in a split supply-conﬁguration.

A voltage follower, operated from a single-supply, is shown in

Figure 7 together with related waveforms. This follower circuit

is linear over a wide dynamic range, as illustrated by the

reproduction of the output waveform in Figure 7B with input

signal ramping. The waveforms in Figure 7C show that the

follower does not lose its input-to-output phase-sense, even

though the input is being swung 7.5V below ground potential.

This unique characteristic is an important attribute in both

operational ampliﬁer and comparator applications. Figure 7C

also shows the manner in which the CMOS output stage

permits the output signal to swing down to the negative supply

rail potential (i.e., ground in the case shown). The digital-to-

analog converter (DAC) circuit, described in the following

section, illustrates the practical use of the CA5160 in a single-

supply voltage follower application.

3

2

8

4

7

6

RL

Q8

Q12

+

-

OUTPUT

STAGE

FIGURE 4A. DUAL POWER-SUPPLY OPERATION

V+

V-

3

2

8

4

7

6

RL

Q8

Q12

+

-

OUTPUT

STAGE

FIGURE 4B. SINGLE POWER-SUPPLY OPERATION

FIGURE 4. CA5160 OUTPUT STAGE IN DUAL AND SINGLE

POWER SUPPLY OPERATION

V+

6

7

3

4

2

+7.5V

0.01

µF

NOISE

VOLTAGE

OUTPUT

30.1k

Ω

0.01

µF

1k

Ω

-7.5V

RS

1M

Ω

+

-

BW (-3dB) = 200kHz

TOTAL NOISE VOLTAGE

(INPUT REFERRED) = 40

µV (TYP)

FIGURE 5. TEST-CIRCUIT AMPLIFIER (30dB GAIN) USED FOR

WIDEBAND NOISE MEASUREMENTS

6

7

3

4

2

+7.5V

0.01

µF

0.01

µF

-7.5V

10k

Ω

+

-

2k

Ω

25pF

SIMULATED

LOAD

CAPACITANCE

0.1

µF

BW (-3dB) = 4MHz

SR = 10V/

µs

2k

Ω

FIGURE 6A. DUAL SUPPLY FOLLOWER

CA5160

Ähnliche Beschreibung - CA5160E

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