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參數(shù)資料
| 型號(hào)： | XR-2206P |
| 廠商： | EXAR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Waveform Generator/Support |
| 中文描述： | SQUARE; TRIANGULAR; SINE; SAWTOOTH; PULSE, 1 MHz, WAVEFORM GENERATION, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 191K |
| 代理商： | XR-2206P |
XR-2206
11
Rev. 1.03
With External Adjustment:
The harmonic content of sinusoidal output can be
reduced to -0.5% by additional adjustments as shown in
Figure 12.
The
potentiometer,
sine-shaping resistor, and R
B
provides the fine
adjustment for the waveform symmetry. The adjustment
procedure is as follows:
R
A
,
adjusts
the
1.
Set R
B
at midpoint and adjust R
A
for minimum
distortion.
2.
With R
A
set as above, adjust R
B
to further reduce
distortion.
Triangle Wave Generation
The circuits of Figure 11and Figure 12can be converted
to triangle wave generation, by simply open-circuiting Pin
13 and 14 (i.e., S
1
open). Amplitude of the triangle is
approximately twice the sine wave output.
FSK Generation
Figure 13shows the circuit connection for sinusoidal FSK
signal operation. Mark and space frequencies can be
independently adjusted by the choice of timing resistors,
R
1
and R
2
; the output is phase-continuous during
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 14shows 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
1
and R
2
. The values of R
1
and
R
2
should be in the range of 1k to 2M .
PRINCIPLES OF OPERATION
Description of Controls
Frequency of Operation:
The frequency of oscillation, f
o
, is determined by the
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:
f
0
1
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
T
, drawn from Pin 7 or 8:
f
320I
T
(mA)
C( F)
Hz
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
C
, to the
activated timing pin as shown in Figure 10.The frequency
of oscillation is related to VC as:
f
1
RC
1
R
R
C
1 –V
C
3
Hz
where V
C
is in volts. The voltage-to-frequency conversion
gain, K, is given as:
K
f
V
C
–0.32
R
C
C
Hz V
CAUTION:
For safety operation of the circuit, I
T
should be
limited to
3mA.
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| XR2207 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
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