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TAN-005 Datasheet(PDF) 3 Page - Exar Corporation

Part No. TAN-005
Description  High-Quality Function Generator System with the XR-2206
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

TAN-005 Datasheet(HTML) 3 Page - Exar Corporation

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TAN-005
3
Rev. 1.02
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 1000
W.
(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
Nominal Range
Timing Capacitance
1
1Hz to 100Hz
1
mF
2
10Hz to 1KHz
0.1
mF
3
100Hz to 10KHz
0.01
mF
4
1Hz to 100kHz
0.001
mF
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


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