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TAN-005

更新时间： 2024-01-21 08:35:46

品牌	Logo	应用领域
艾科嘉 - EXAR		/
页数	文件大小	规格书
8页	67K
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High-Quality Function Generator System with the XR-2206

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TAN-005 数据手册

TAN-005

High-Quality Function Generator

System with the XR-2206

...the analog plus company^TM

June 1997-3

INTRODUCTION

Waveform or function generators capable of producing

AM/FM modulated sine wave outputs find a wide range of

applications in electrical measurement and laboratory

instrumentation. This application note describes the

design, construction and performance of such a complete

function generator system suitable for laboratory usage

or hobbyist applications. The entire function generator is

comprised of a single XR-2206 monolithic IC and alimited

number of passive circuit components. It provides the

engineer, student, or hobbyist with a highly versatile

laboratory instrument for waveform generation, at a very

small fraction of the cost of conventional function

generators available today.

However, they represent the typical performance

characteristics measured by EXAR’s application

engineers during the laboratory evaluation of thefunction

generator system shown in Figure 1. The typical

performance specifications listed below apply only when

all of the recommended assembly instructions and

adjustment procedures are followed:

(a) Frequency Ranges: The function generator system

is designed to operate over four overlapping

frequency ranges:

1Hz

100Hz

1KHz

10Hz

100Hz

1KHz

10KHz

100KHz

GENERAL DESCRIPTION

The range selection is made by switching in different

timing capacitors.

The basic circuit configuration and the external

components necessary for the high-quality function

generator system is shown in Figure 1. The circuit shown

is designed to operate with either a 12V single power

supply, or with 16V split supplies. For most applications,

split-supply operation is preferred since it results in an

output dc level which is nearly at ground potential.

(b) Frequency Setting: At any range setting, frequency

can be varied over a 100:1 tuning range with a

potentiometer (see R13 of Figure 1.)

XR-2206 is set by the timing resistor R and the timing

capacitor C, and is given as:

The circuit configuration of Figure 1 provides three basic

waveforms: sine, triangle and square wave. There are

four overlapping frequency ranges which give an overall

frequency range of 1Hz to 100KHz. In each range, the

frequency may be varied over a 100:1 tuning range.

f = 1/RC

The above expression is accurate to within 15% at any

range setting. The timing resistor R is the series

combination of resistors R4 and R13 of Figure 1. The

timing capacitor C is any one of the capacitors C3

through C6, shown in the figure.

The sine or triangle output can be varied from 0 to over 6V

(peak to peak) from a 600W source at the output terminal.

(d) Sine and Triangle Output: The sine and triangle

output amplitudes are variable from 0V to 6Vpp. The

amplitude is set by an external potentiometer, R12 of

Figure 1. At any given amplitude setting, the triangle

output amplitude is approximately twice as high as the

sinewave output. The internal impedance of the output

is 600W.

A squarewave output is available at the sync output terminal

for oscilloscope synchronizing or driving logic circuits.

TYPICAL PERFORMANCE CHARACTERISTICS

The performance characteristics listed are not

guaranteed or warranted by EXAR Corporation.

Rev. 1.02

E1995

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017

12 3 4 5 6 7 8

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