TAN-005 Просмотр технического описания (PDF) - Exar Corporation

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TAN-005

High-Quality Function Generator System with the XR-2206

Exar Corporation 

TAN-005

g) Frequency Modulation (External Sweep):

Frequency can be modulated or swept by applying an

external control voltage to sweep terminal (Terminal I of

Figure 1.) When not used, this terminal should be left

open circuited. The open circuit voltage at this terminal

is approximately 3V above the negative supply voltage

and its impedance is approximately 1000W.

(h) Amplitude Modulation: The output amplitude varies

linearly with modulation voltage applied to AM input

(terminal Q of Figure 1.) The output amplitude

reaches its minimum as the AM control voltage

approaches the half of the total power supply voltage.

The phase of the output signal reverses as the

amplitude goes through its minimum value. The total

dynamic range is approximately 55dB, with AM

control voltage range of 4V referenced to the half of

the total supply voltage. When not used, AM terminal

should be left open-circuited.

(i) Power Source: Split Supplies: +/-6V, or single

supply: +12V. Supply Current 15mA (see Figure 2).

For single supply operation bias resistors, R14 and

R15 should be added, the GND point left floating and

V-tied to ground.

EXPLANATION OF CIRCUIT CONTROLS

Switches

Range Select Switch, S1: Selects the frequency range of

operation for the function generator. The frequency is

inversely proportional to the timing capacitor connected

across Pins 5 and 6 of the XR-2206 circuit. Nominal

capacitance values and frequency ranges corresponding

to switch positions of S1 are as follows:

Position

1

2

3

4

Nominal Range

1Hz to 100Hz

10Hz to 1KHz

100Hz to 10KHz

1Hz to 100kHz

Timing Capacitance

1mF

0.1mF

0.01mF

0.001mF

If additional frequency ranges are needed, they can be

added by introducing additional switch positions.

Triangle/Sine Waveform Switch, S2: Selects the triangle

or sine output waveform.

Trimmers and Potentiometers

DC Offset Adjustment, R9: The potentiometer used for

adjusting the dc offset level of the triangle or sine output

waveform.

Sinewave Distortion Adjustment, R10: Adjusted to

minimize the harmonic content of sinewave output.

Sinewave Symmetry Adjustment, R11: Adjusted to

optimize the symmetry of the sinewave output.

Amplitude Control, R12: Sets the amplitude of the triangle

or sinewave output.

Frequency Adjust, R13: Sets the oscillator frequency for any

range setting of S1. Thus, R13 serves as a frequency dial on

a conventional waveform generator and varies the frequency

of the oscillator over an approximate 100 to 1 range.

Terminals

A. Negative Supply -6V

B. Ground

C. Positive Supply +6V

D. Range 1, timing capacitor terminal

E. Range 2, timing capacitor terminal

F. Range 3. timing capacitor terminal

G. Range 4, timing capacitor terminal

H. Timing capacitor common terminal

I. Sweep Input

J. Frequency adjust potentiometer terminal

K. Frequency adjust potentiometer negative supply

terminal

L. Sync output (1/2 swing)

M. Sync output (full swing)

N. Triangle/sine waveform switch terminals

O. Triangle/sine waveform switch terminals

P. Triangle or sinewave output

Q. AM input

R. Amplitude control terminal

Rev. 1.02

3

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