參數(shù)資料
型號(hào)： XR8038
廠商： Exar Corporation
英文描述： Precision Waveform Generator
中文描述： 精密波形發(fā)生器
文件頁(yè)數(shù)： 10/16頁(yè)
文件大小： 150K
代理商： XR8038
XR-8038A
10
Rev. 2.01
SELECTING TIMING COMPONENTS
For any given output frequency, there is a wide range of R
and C combinations that will work. However, certain
constraints are placed upon the magnitude of the
charging current for optimum performance. At the low
end, currents of less than 0.1 A are undesirable because
circuit leakages will contribute significant errors at high
temperatures. At higher currents (1 > 5mA), transistor
betas and saturation voltages will contribute increasingly
large errors. Optimum performance will be obtained for
charging currents of 1 A to 1mA. If pins 7 and 8 are
shorted together, the magnitude of the charging current
due to R
A
can be calculated from:
I
R
1
·V
CC
(R
1
R
2
)·R
A
V
CC
5R
A
A similar calculation holds for R
B
.
When the duty cycle is greater than 60%, the device may
not oscillate every time, unless:
1. The rise times of the V+ are 10X times slower than
R
A
C
T
.
2. A 0.1 F capacitor is tied from pin 7 and 8 to ground.
NOTE:
-
This is only needed if the duty cycle is powered up with
R
A
>>R
B
.
SINGLE-SUPPLY AND SPLIT-SUPPLY OPERATION
The waveform generator can be operated either from a
single power supply (10V to 30V) or a dual power supply
(+5V to +15V). With a single power supply the average
levels of the triangle and sine wave are at exactly one half
of the supply voltage, while the square wave alternates
between +V
CC
and ground. A split power supply has the
advantage that all waveforms move symmetrically about
ground.
The square wave output is not committed. A load resistor
can be connected to a different power supply, as long as
the applied voltage remains within the breakdown
capability of the waveform generator (30V). In this way,
the square wave output will be TTL compatible (load
resistor connected to +5V) while the waveform generator
itself is powered from a higher supply voltage.
FREQUENCY MODULATION AND SWEEP
The frequency of the waveform generator is an inverse
function of the dc voltage at pin 8 (measured from +V
CC
).
By altering this voltage, frequency modulation is
performed.
For small deviations (e.g., +10%), the modulating signal
can be applied to pin 8 by merely providing ac coupling
with a capacitor, as shown in Figure 8. An external
resistor between pins 7 and 8 is not necessary, but it can
be used to increase input impedance. Without it (i.e. pins
7 and 8 connected together), the input impedance is
8K ); with it, this impedance increases to (R // 8K
For larger FM deviations or for frequency sweeping, the
modulating signal is applied between the positive supply
voltage and pin 8 (Figure 9.) In this way the entire bias for
the current sources is created by the modulating signal
and a very large (e.g. 1000:1) sweep range is obtained
(f=0 at V
SWEEP
=0). Care must be taken, however, to
regulate the supply voltage; in this configuration the
charge current is no longer a function of the supply
voltage (yet the trigger thresholds still are) and thus the
frequency becomes dependent on the supply voltage.
The potential on pin 8 may be swept from V
CC
to 2/3
V
CC
-2V.
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