CA5130AE 查看數據表（PDF） - Intersil

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CA5130AE

15MHz, BiMOS Microprocessor Operational Amplifiers with MOSFET Input/CMOS Output

Intersil 

CA5130, CA5130A

Peak Detectors

Peak detector circuits are easily implemented with the

CA5130, as illustrated in Figure 7 for both the peak positive

and the peak negative circuit. It should be noted that with

large signal inputs, the bandwidth of the peak negative

circuit is much less than that of the peak positive circuit. The

second stage of the CA5130 limits the bandwidth in this

case. Negative going output signal excursion requires a

positive going signal excursion at the collector of transistor

Q11, which is loaded by the intrinsic capacitance of the

associated circuitry in this mode. On the other hand, during

a negative going signal excursion at the collector of Q11, the

transistor functions in active “pull down” mode so that the

intrinsic capacitance can be discharged more expeditiously.

Error Amplifier In Regulated Power Supplies

The CA5130 is an ideal choice for error amplifier service in

regulated power supplies since it can function as an error

amplifier when the regulated output voltage is required to

approach 0V. Figure 8 shows the schematic diagram of a

40mA power supply capable of providing regulated output

voltage by continuous adjustment over the range from 0V to

13V. Q3 and Q4 in IC2 (a CA3066 transistor array lC)

function as zeners to provide supply voltage for the CA5130

comparator (lC1). Q1, Q2, and Q5 in lC2 are configured as a

low impedance, temperature compensated source of

adjustable reference voltage for the error amplifier.

Transistors Q1, Q2, Q3, and Q4 in lC3 (another CA3086

transistor array lC) are connected in parallel as the series

pass element. Transistor Q5 in lC3 functions as a current

limiting device by diverting base drive from the series pass

transistors, in accordance with the adjustment of resistor R2.

Figure 9 contains the schematic diagram of a regulated

power supply capable of providing regulated output voltage

by continuous adjustment over the range from 0.1V to 50V

and currents up to 1A. The error amplifier (lC1) and circuitry

associated with lC2 function as previously described,

although the output of lC1 is boosted by a discrete transistor

(Q4) to provide adequate base drive for the Darlington

connected series pass transistors Q1, Q2. Transistor Q3

functions in the previously described current limiting circuit.

Multivibrators

The exceptionally high input resistance presented by the

CA5130 is an attractive feature for multivibrator circuit

design because it permits the use of timing circuits with high

R/C ratios. The circuit diagram of a pulse generator (astable

multivibrator), with provisions for independent control of the

“on” and “off” periods, is shown in Figure 10. Resistors R1

and R2 are used to bias the CA5130 to the midpoint of the

supply voltage and R3 is the feedback resistor. The pulse

repetition rate is selected by positioning S1 to the desired

position and the rate remains essentially constant when the

resistors which determine “on period” and “off period” are

adjusted.

Function Generator

Figure 11 contains a schematic diagram of a function

generator using the CA5130 in the integrator and threshold

detector functions. This circuit generates a triangular or

square wave output that can be swept over a 1,000,000:1

range (0.1Hz to 100kHz) by means of a single control, R1. A

voltage control input is also available for remote sweep

control.

The heart of the frequency determining system is an

operational transconductance amplifier (OTA) (see Note 9),

lC1, operated as a voltage controlled current source. The

output, IO, is a current applied directly to the integrating

capacitor, C1, in the feedback loop of the integrator lC2,

using a CA5130, to provide the triangular wave output.

Potentiometer R2 is used to adjust the circuit for slope

symmetry of positive going and negative going signal

excursions.

Another CA5130, lC3, is used as a controlled switch to set

the excursion limits of the triangular output from the

integrator circuit. Capacitor C2 is a “peaking adjustment” to

optimize the high frequency square wave performance of the

circuit.

Potentiometer R3 is adjustable to perfect the “amplitude

symmetry” of the square wave output signals. Output from

the threshold detector is fed back via resistor R4 to the input

of lC1 so as to toggle the current source from plus to minus

in generating the linear triangular wave.

Operation with Output Stage Power-Booster

The current sourcing and sinking capability of the CA5130

output stage is easily supplemented to provide power boost

capability. In the circuit of Figure 12, three CMOS transistor

pairs in a single CA3600E (see Note 10) lC array are shown

parallel connected with the output stage in the CA5130. In

the Class A mode of CA3600E shown, a typical device

consumes 20mA of supply current at 15V operation. This

arrangement boosts the current handling capability of the

CA5130 output stage by about 2.5X.

The amplifier circuit in Figure 12 employs feedback to

establish a closed-loop gain of 48dB. The typical large signal

bandwidth (-3dB) is 50kHz.

NOTES:

9. See File No. 475 and AN6668.

10. See File No. 619 for technical information.

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