XR2206D EXAR [Exar Corporation], XR2206D Datasheet - Page 11

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XR2206D

Manufacturer Part Number
XR2206D
Description
Monolithic Function Generator
Manufacturer
EXAR [Exar Corporation]
Datasheet

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With External Adjustment:
The harmonic content of sinusoidal output can be
reduced to -0.5% by additional adjustments as shown in
Figure 12.
sine-shaping resistor, and R
adjustment for the waveform symmetry. The adjustment
procedure is as follows:
1. Set R
2. With R
Triangle Wave Generation
The circuits of Figure 11 and Figure 12 can be converted
to triangle wave generation, by simply open-circuiting Pin
13 and 14 (i.e., S
approximately twice the sine wave output.
FSK Generation
Figure 13 shows the circuit connection for sinusoidal FSK
signal operation. Mark and space frequencies can be
independently adjusted by the choice of timing resistors,
R
transitions. The keying signal is applied to Pin 9. The
circuit can be converted to split-supply operation by
simply replacing ground with V
Pulse and Ramp Generation
Figure 14 shows the circuit for pulse and ramp waveform
generation. In this mode of operation, the FSK keying
terminal (Pin 9) is shorted to the square-wave output (Pin
11), and the circuit automatically frequency-shift keys
itself between two separate frequencies during the
positive-going and negative-going output waveforms.
The pulse width and duty cycle can be adjusted from 1%
to 99% by the choice of R
R
1
2
should be in the range of 1k
distortion.
distortion.
and R
Rev. 1.03
B
A
2
at midpoint and adjust R
; the output is phase-continuous during
set as above, adjust R
The
1
potentiometer,
open). Amplitude of the triangle is
1
and R
-
.
B
2
to 2M .
. The values of R
B
A
provides the fine
R
to further reduce
for minimum
A
,
adjusts
1
and
the
11
PRINCIPLES OF OPERATION
Description of Controls
Frequency of Operation:
The frequency of oscillation, f
external timing capacitor, C, across Pin 5 and 6, and by
the timing resistor, R, connected to either Pin 7 or 8. The
frequency is given as:
and can be adjusted by varying either R or C. The
recommended values of R, for a given frequency range,
as shown in Figure 5. Temperature stability is optimum
for 4k < R < 200k . Recommended values of C are from
1000pF to 100 F.
Frequency Sweep and Modulation:
Frequency of oscillation is proportional to the total timing
current, I
Timing terminals (Pin 7 or 8) are low-impedance points,
and are internally biased at +3V, with respect to Pin 12.
Frequency varies linearly with IT, over a wide range of
current values, from 1 A to 3mA. The frequency can be
controlled by applying a control voltage, V
activated timing pin as shown in Figure 10. The frequency
of oscillation is related to VC as:
where V
gain, K, is given as:
CAUTION: For safety operation of the circuit, I
limited to
C
T
is in volts. The voltage-to-frequency conversion
, drawn from Pin 7 or 8:
f
3mA.
K
RC
1
f
f V
1
f
0
320 I
C
C( F)
R
RC
R
T
1
C
– 0.32
( mA )
1 –
R
Hz
o
, is determined by the
C
C
XR-2206
Hz
V
3
C
Hz V
Hz
T
C
should be
, to the

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