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부품번호 | XR-8038A 기능 |
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기능 | Precision Waveform Generator | ||
제조업체 | Exar Corporation | ||
로고 | |||
전체 16 페이지수
...the analog plus companyTM
XR-8038A
Precision Waveform
Generator
FEATURES
D Low Frequency Drift, 50ppm/°C, Typical
D Simultaneous Sine, Triangle, and Square Wave
Outputs
D Low Sine Wave Distortion - THD ] 1%
D High FM and Triangle Linearity
D Wide Frequency Range 0.001Hz to 200KHz
D Variable Duty Cycle, 2% to 98%
D Low Distortion Variation with Temperature
APPLICATIONS
June 1997-3
D Precision Waveform Generation
D Sweep and FM Generation
D Tone Generation
D Instrumentation and Test Equipment Design
D Precision PLL Design
GENERAL DESCRIPTION
The XR-8038A is a precision waveform generator IC
capable of producing sine, square, triangular, sawtooth,
and pulse waveforms, with a minimum number of external
components and adjustments. The XR-8038A allows the
elimination of the external distortion adjusting resistor
which greatly improves the temperature drift of distortion,
as well as lowering external parts count. Its operating
frequency can be selected over eight decades of
frequency, from 0.001Hz to 200kHz, by the choice of
external R-C components. The frequency of oscillation is
highly stable over a wide range of temperature and supply
voltage changes. Both full frequency sweeping as well as
smaller frequency variations (FM) can be accomplished
with an external control voltage. Each of the three basic
waveform outputs, (i.e., sine, triangle and square) are
simultaneously available from independent output
terminals.
The XR-8038A monolithic waveform generator uses
advanced processing technology and Schottky-barrier
diodes to enhance its frequency performance.
ORDERING INFORMATION
Part No.
XR-8038ACP
Package
14 Lead 300 mil PDIP
Operating
Temperature Range
0°C to 70°C
Rev. 2.01
E1992
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1
XR-8038A
DC ELECTRICAL CHARACTERISTICS
Test Conditions: VS = +5V to +15V, TA = 25°C, RL = 1MW, RA = RB = 10kW, C1 = 3300pF, S1 closed, unless
otherwise specified. (See Figure 2.)
Parameter
Min.
General Characteristics
Supply Voltage, VS
Single Supply
10
Dual Supplies
+5
Supply Current
Frequency Characteristics (Measured at Pin 9)
Range of Adjustment
Max. Operating Frequency
200
Typ.
12
Lowest Practical Frequency
0.001
Max. Sweep Frequency of FM
Input
FM Sweep Range
FM Linearity 10:1 Ratio
Range of Timing Resistors
Temperature Stability
Power Supply Stability
Output Characteristics
Square-Wave
Amplitude (Peak-to-Peak)
Saturation Voltage
Rise Time
Fall Time
Duty Cycle Adjustment
Triangle/Sawtooth/Ramp
Amplitude (Peak-to-Peak)
Linearity
100
1000:1
0.2
0.5
50
0.05
0.9 0.98
0.2
100
40
2
0.3 0.33
0.1
Max.
Unit Conditions
30 V
+15 V
20 mA VS = +10V1
1000
0.5
98
kHz RA = RB, = 1.5kW, C1 = 680pF;
RL = 10K
Hz RA = RB = 1MW, C1= 500mF
(Low Leakage Capacitor)
kHz
%
KW
PPM/°C
%/V
S1 Open2,3
S1 Open3
Values of RA and RB
TA = 0°C to 70°C
10V VS 30V or +5V VS 15V
x VSPLY
V
ns
ns
%
x VSPLY
%
Measured at Pin 9
RL = 100kW
ISINK = 2mA
RL = 4.7kW
RL = 4.7kW
Measured at Pin 3
RL = 100kW
Notes
1 Currents through RA and RB not included.
2 VSUPPLY = 20V.
3 Apply sweep voltage at Pin 8.
VCC - (1/3 VSUPPLY - 2) VPIN 8 VCC
VSUPPLY = Total Supply Voltage across the IC
Rev. 2.01
Specifications are subject to change without notice
4
4페이지 XR-8038A
VCC
11
RA
R2 IA
10K
78
Buffer 4
10
VCC SWITCH S
R1
40K C
RB
Buffer 5
2IB
11
VEE
Figure 3. Detailed View of Current Sources IA and 2IB.
WAVEFORM ADJUSTMENT
The symmetry of all waveforms can be adjusted with the
external timing resistors. Two possible ways to
accomplish this are shown in Figure 4, Figure 5, and
Figure 6. Best results are obtained by keeping the timing
resistors RA and RB separate (Figure 4.) RA controls the
rising portion of the triangle and sine wave and the “low”
state of the square wave.
The magnitude of the triangle waveform is set at 1/3 VCC;
therefore, the duration of the rising proportion of the
triangle is:
pins 4 and 5 can be shorted together, as shown in
Figure 6. This connection, however, carries an inherently
larger variation of the duty cycle.
With two separate timing resistors the frequency is given
by:
ǒ Ǔf
+
1
t1 ) t2
+1
5
3
·R
AC
1
)
RB
2RA–RB
or, if RA = RB = R
t1
+
C·|DV|
IA
+
C·|
2
3
VCC-
VCC
1
3
VCC|
+
5
3
RA·C
5RA
The duration of the falling portion of the triangle and sine
wave and the ”low” state of the square wave is:
t2
+
C·|DV|
2IB-IA
+
C·|
2
3
V
CC-
1
3
V
CC|
-2VCC VCC
5RB 5RA
+
5
3
·
RARBC
2RA-RB
Thus a 50% duty cycle is achieved when RA = RB
If the duty-cycle is to be varied over a small range about
50%, the connection shown in Figure 5 is slightly more
convenient. If no adjustment of the duty cycle is desired,
f
+
0.3
RC
(for Figure 4. )
If a single timing resistor is used (Figure 5 and Figure 6),
the frequency is:
f
+
0.15
RC
The frequency of oscillation is independent of supply
voltage, even though none of the voltages are regulated
inside the integrated circuit. This is due to the fact that
both currents and thresholds are direct, linear function of
the supply voltage and thus their effects cancel.
Rev. 2.01
7
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부품번호 | 상세설명 및 기능 | 제조사 |
XR-8038A | Precision Waveform Generator | Exar Corporation |
XR-8038ACP | Precision Waveform Generator | Exar Corporation |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |