XR-2206P [EXAR]
Waveform Generator/Support ; 波形发生器/支持\n
| 型号： | XR-2206P |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Waveform Generator/Support
|
| 文件： | 总16页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XR-2206
Monolithic
Function Generator
...the analog plus companyTM
June 1997-3
FEATURES
APPLICATIONS
D Waveform Generation
D Sweep Generation
D AM/FM Generation
D V/F Conversion
D Low-Sine Wave Distortion, 0.5%, Typical
D Excellent Temperature Stability, 20ppm/°C, Typ.
D Wide Sweep Range, 2000:1, Typical
D Low-Supply Sensitivity, 0.01%V, Typ.
D Linear Amplitude Modulation
D FSK Generation
D TTL Compatible FSK Controls
D Phase-Locked Loops (VCO)
D Wide Supply Range, 10V to 26V
D Adjustable Duty Cycle, 1% TO 99%
GENERAL DESCRIPTION
The XR-2206 is a monolithic function generator
integrated circuit capable of producing high quality sine,
square, triangle, ramp, and pulse waveforms of
high-stabilityand accuracy. The output waveforms can be
both amplitude and frequency modulated by an external
voltage. Frequency of operation can be selected
externally over a range of 0.01Hz to more than 1MHz.
The circuit is ideally suited for communications,
instrumentation, and function generator applications
requiring sinusoidal tone, AM, FM, or FSK generation. It
hasatypicaldriftspecificationof20ppm/°C. Theoscillator
frequency can be linearly swept over a 2000:1 frequency
range with an external control voltage, while maintaining
low distortion.
ORDERING INFORMATION
Operating
Temperature Range
Part No.
Package
16 Lead 300 Mil CDIP
XR-2206M
-55°C to +125°C
–40°C to +85°C
0°C to +70°C
XR-2206P
XR-2206CP
XR-2206D
16 Lead 300 Mil PDIP
16 Lead 300 Mil PDIP
16 Lead 300 Mil JEDEC SOIC
0°C to +70°C
Rev. 1.03
E1972
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z (510) 668-7017
1
XR-2206
V
GND
12
BIAS
10
CC
4
11 SYNCO
5
6
TC1
Timing
Capacitor
VCO
TC2
7
TR1
Timing
Resistors
Current
Switches
Multiplier
And Sine
Shaper
8
9
+1
TR2
FSKI
AMSI
2
3
STO
MO
1
WAVEA1 13
WAVEA2 14
SYMA1 15
SYMA2 16
Figure 1. XR-2206 Block Diagram
Rev. 1.03
2
XR-2206
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AMSI
STO
MO
SYMA2
SYMA1
1
2
3
4
5
16
15
14
13
12
SYMA2
SYMA1
AMSI
STO
MO
WAVEA2
WAVEA1
GND
WAVEA2
WAVEA1
GND
V
CC
V
CC
TC1
TC1
TC2
TR1
TR2
SYNCO
BIAS
FSKI
6
7
11
10
9
SYNCO
BIAS
FSKI
TC2
TR1
TR2
8
16 Lead PDIP, CDIP (0.300”)
16 Lead SOIC (Jedec, 0.300”)
PIN DESCRIPTION
Pin #
1
Symbol
AMSI
STO
Type Description
I
Amplitude Modulating Signal Input.
2
O
O
Sine or Triangle Wave Output.
Multiplier Output.
3
MO
4
VCC
Positive Power Supply.
Timing Capacitor Input.
Timing Capacitor Input.
Timing Resistor 1 Output.
Timing Resistor 2 Output.
Frequency Shift Keying Input.
Internal Voltage Reference.
5
TC1
I
6
TC2
I
7
TR1
O
O
I
8
TR2
9
FSKI
10
11
12
13
14
15
16
BIAS
O
O
SYNCO
GND
Sync Output. This output is a open collector and needs a pull up resistor to VCC
Ground pin.
.
WAVEA1
WAVEA2
SYMA1
SYMA2
I
I
I
I
Wave Form Adjust Input 1.
Wave Form Adjust Input 2.
Wave Symetry Adjust 1.
Wave Symetry Adjust 2.
Rev. 1.03
3
XR-2206
DC ELECTRICAL CHARACTERISTICS
Test Conditions: Test Circuit of Figure 2 Vcc = 12V, T = 25°C, C = 0.01mF, R = 100kW, R = 10kW, R = 25kW
A
1
2
3
Unless Otherwise Specified. S open for triangle, closed for sine wave.
1
XR-2206M/P
Typ.
XR-2206CP/D
Parameters
General Characteristics
Single Supply Voltage
Split-Supply Voltage
Supply Current
Min.
Max.
Min.
Typ.
Max.
Units Conditions
10
+5
26
+13
17
10
+5
26
+13
20
V
V
12
14
mA
R1 ꢀ 10kW
Oscillator Section
Max. Operating Frequency
Lowest Practical Frequency
Frequency Accuracy
0.5
1
0.5
1
MHz
Hz
C = 1000pF, R1 = 1kW
C = 50mF, R1 = 2MW
0.01
+1
0.01
+2
+4
% of fo fo = 1/R1C
Temperature Stability
Frequency
+10
+50
+20
ppm/°C 0°C ꢁ TA ꢁ 70°C
R1 = R2 = 20kW
Sine Wave Amplitude Stability2
Supply Sensitivity
4800
0.01
4800
0.01
ppm/°C
0.1
%/V
VLOW = 10V, VHIGH = 20V,
R1 = R2 = 20kW
Sweep Range
1000:1 2000:1
2000:1
fH = fL fH @ R1 = 1kW
fL @ R1 = 2MW
Sweep Linearity
10:1 Sweep
2
8
2
8
%
%
%
fL = 1kHz, fH = 10kHz
1000:1 Sweep
FM Distortion
fL = 100Hz, fH = 100kHz
+10% Deviation
0.1
0.1
Recommended Timing Components
Timing Capacitor: C
Timing Resistors: R1 & R2
Triangle Sine Wave Output1
Triangle Amplitude
0.001
100
0.001
1
100
mF
Figure 5
1
2000
2000
kW
Figure 3
160
60
6
160
60
6
mV/kW Figure 2, S1 Open
Sine Wave Amplitude
Max. Output Swing
Output Impedance
40
80
mV/kW Figure 2, S1 Closed
Vp-p
W
600
1
600
1
Triangle Linearity
%
Amplitude Stability
0.5
0.5
dB
For 1000:1 Sweep
Sine Wave Distortion
Without Adjustment
With Adjustment
2.5
0.4
2.5
0.5
%
%
R1 = 30kW
1.0
1.5
See Figure 7 and Figure 8
Notes
1 Output amplitude is directly proportional to the resistance, R3, on Pin 3. See Figure 3.
2 For maximum amplitude stability, R3 should be a positive temperature coefficient resistor.
Bold face parameters are covered by production test and guaranteed over operating temperature range.
Rev. 1.03
4
XR-2206
DC ELECTRICAL CHARACTERISTICS (CONT’D)
XR-2206M/P
XR-2206CP/D
Parameters
Min.
Typ.
Max.
Min.
Typ.
Max.
Units Conditions
Amplitude Modulation
Input Impedance
Modulation Range
Carrier Suppression
Linearity
50
100
100
55
50
100
100
55
kW
%
dB
%
2
2
For 95% modulation
Square-Wave Output
Amplitude
12
250
50
12
250
50
Vp-p
ns
ns
V
Measured at Pin 11.
CL = 10pF
Rise Time
Fall Time
CL = 10pF
Saturation Voltage
Leakage Current
FSK Keying Level (Pin 9)
Reference Bypass Voltage
0.2
0.1
1.4
3.1
0.4
20
0.2
0.1
1.4
3
0.6
100
2.4
3.5
IL = 2mA
mA
V
VCC = 26V
0.8
2.9
2.4
3.3
0.8
2.5
See section on circuit controls
Measured at Pin 10.
V
Notes
1 Output amplitude is directly proportional to the resistance, R3, on Pin 3. See Figure 3.
2 For maximum amplitude stability, R3 should be a positive temperature coefficient resistor.
Bold face parameters are covered by production test and guaranteed over operating temperature range.
Specifications are subject to change without notice
ABSOLUTE MAXIMUM RATINGS
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . 750mW
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . 5mW/°C
Total Timing Current . . . . . . . . . . . . . . . . . . . . . . . . 6mA
Storage Temperature . . . . . . . . . . . . -65°C to +150°C
SYSTEM DESCRIPTION
The XR-2206 is comprised of four functional blocks; a
voltage-controlled oscillator (VCO), an analog multiplier
and sine-shaper; a unity gain buffer amplifier; and a set of
current switches.
terminals to ground. With two timing pins, two discrete
output frequencies can be independently produced for
FSK generation applications by using the FSK input
control pin. This input controls the current switches which
select one of the timing resistor currents, and routes it to
the VCO.
The VCO produces an output frequency proportional to
an input current, which is set by a resistor from the timing
Rev. 1.03
5
XR-2206
V
CC
1mF
4
Symmetry Adjust
25K
1
5
16
Mult.
S = Open For Triangle
1
And
Sine
Shaper
C
15
14
VCO
= Closed For Sinewave
6
S
1
THD Adjust
500
13
9
7
8
FSK Input
R1
R2
Triangle Or
Sine Wave
Output
Square Wave
Output
Current
Switches
2
+1
11
XR-2206
10 12
3
10K
R3
25K
1mF
+
V
CC
1mF
V
CC
5.1K
5.1K
Figure 2. Basic Test Circuit
6
26
22
18
70°C Max.
Package
Dissipation
Triangle
5
1KW
4
Sinewave
2KW
3
2
1
10KW
14
10
30KW
8
12
16
20
(V)
24
28
0
20
40
60
80
100
R in (KW)
3
V
CC
Figure 3. Output Amplitude
as a Function of the Resistor,
R3, at Pin 3
Figure 4. Supply Current vs
Supply Voltage, Timing, R
Rev. 1.03
6
XR-2206
10M
1M
MAXIMUM TIMING R
4V
4V
1.0
NORMAL RANGE
100K
TYPICAL VALUE
0.5
0
10K
1K
MINIMUM TIMING R
-2
V
CC
/ 2
2
4
6
10
10
10
10
10
Frequency (Hz)
DC Voltage At Pin 1
Figure 5. R versus Oscillation Frequency.
Figure 6. Normalized Output Amplitude
versus DC Bias at AM Input (Pin 1)
5
5
4
4
C = 0.01mF
R=3KW
Trimmed For Minimum
Distortion At 30 KW
V
OUT
=0.5VRMS Pin 2
R =10KW
L
3
3
2
2
1
1
0
0
3
1.0
10
100
Timing R K(W)
10
10
100
1K
10K
100K 1M
Frequency (Hz)
Figure 7. Trimmed Distortion versus
Timing Resistor.
Figure 8. Sine Wave Distortion versus
Operating Frequency with
Timing Capacitors Varied.
Rev. 1.03
7
XR-2206
3
C=0.01mF
2
R=1MW
R=2KW
R=10KW
R=200KW
1
R=200KW
0
I
I
C
T
R=10KW
R=2KW
Pin 7
or 8
Rc
R=1MW
Sweep
Input
-1
+
R=1KW
I
V
B
C
-
+
-2
-3
3V
-
R
R=1KW
12
-50 -25
0
25
50
75
125
100
Ambient Temperature (C°)
Figure 9. Frequency Drift versus
Temperature.
Figure 10. Circuit Connection for Frequency Sweep.
V
CC
1mF
4
1
5
16
S Closed For Sinewave
1
Mult.
And
Sine
15
14
C
VCO
6
Shaper
S
1
200
13
9
7
Current
Switches
Triangle Or
2
8
+1
Sine Wave Output
R
2M
1K
1
11
Square Wave
Output
XR-2206
10 1 2
3
R
R
50K
3
10K
+
1mF
+
V
CC
10mF
V
CC
5.1K
5.1K
Figure 11. Circuit tor Sine Wave Generation without External Adjustment.
(See Figure 3 for Choice of R )
3
Rev. 1.03
8
XR-2206
V
CC
1mF
4
Symmetry Adjust
1
5
16
25K
R
Mult.
And
Sine
B
15
14
S Closed For Sinewave
1
VCO
C
1
RC
F =
2M
6
9
Shaper
S
1
R
A
13
500
7
8
Current
Switches
2
Triangle Or
+1
R
Sine Wave Output
Square Wave
Output
1K
1
11
10 12
3
R
XR-2206
R
3
10K
50K
+
1mF
+
V
CC
10mF
V
CC
5.1K
5.1K
Figure 12. Circuit for Sine Wave Generation with Minimum Harmonic Distortion.
(R Determines Output Swing - See Figure 3)
3
V
CC
1mF
4
1
5
16
15
14
Mult.
And
Sine
C
F
F
VCO
>2V
<1V
1
6
Shaper
2
200
13
9
7
8
FSK Input
R
R
1
2
Current
Switches
2
+1
FSK Output
11
F1=1/R1C
F2=1/R2C
10 12
3
XR-2206
R
3
50K
+
1mF
+
10mF
V
CC
5.1K
5.1K
Figure 13. Sinusoidal FSK Generator
Rev. 1.03
9
XR-2206
V
CC
2
1
ƪ ƫ
f +
1mF
C R1 ) R2
4
1
5
R1
16
Duty Cycle =
R1 ) R2
Mult.
And
Sine
C
15
14
VCO
6
Shaper
9
7
8
13
R
R
1
2
Current
Switches
2
Sawtooth Output
Pulse Output
+1
11
10 12
3
XR-2206
R
3
5.1K
V
24K
+
1mF
+
CC
10mF
V
CC
5.1K
5.1K
Figure 14. Circuit for Pulse and Ramp Generation.
APPLICATIONS INFORMATION
Frequency-Shift Keying
The XR-2206 can be operated with two separate timing
resistors, R and R , connected to the timing Pin 7 and 8,
Sine Wave Generation
1
2
respectively, as shown in Figure 13. Depending on the
polarity of the logic signal at Pin 9, either one or the other
of these timing resistors is activated. If Pin 9 is
open-circuited or connected to a bias voltage ꢀ 2V, only
Without External Adjustment
Figure 11 shows the circuit connection for generating a
sinusoidal output from the XR-2206. The potentiometer,
R at Pin 7, provides the desired frequency tuning. The
maximum output swing is greater than V /2, and the
R is activated. Similarly, if the voltage level at Pin 9 is
1
1
+
ꢁ1V, only R is activated. Thus, the output frequency can
2
typical distortion (THD) is < 2.5%. If lower sine wave
distortion is desired, additional adjustments can be
provided as described in the following section.
be keyed between two levels. f and f , as:
1
2
f = 1/R C and f = 1/R C
1
1
2
2
For split-supply operation, the keying voltage at Pin 9 is
referenced to V .
The circuit of Figure 11 can be converted to split-supply
-
operation, simply by replacing all ground connections
-
with V . For split-supply operation, R can be directly
3
connected to ground.
Output DC Level Control
The dc level at the output (Pin 2) is approximately the
same as the dc bias at Pin 3. In Figure 11, Figure 12 and
Figure 13, Pin 3 is biased midway between V+ and
+
ground, to give an output dc level of ꢂ V /2.
Rev. 1.03
10
XR-2206
With External Adjustment:
PRINCIPLES OF OPERATION
Description of Controls
Frequency of Operation:
The harmonic content of sinusoidal output can be
reduced to -0.5% by additional adjustments as shown in
Figure 12. The potentiometer, R , adjusts the
A
The frequency of oscillation, f , is determined by the
o
sine-shaping resistor, and R provides the fine
B
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:
adjustment for the waveform symmetry. The adjustment
procedure is as follows:
1. Set R at midpoint and adjust R for minimum
B
A
distortion.
1
RC
f0 +
Hz
2. With R set as above, adjust R to further reduce
A
B
distortion.
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 4kW < R < 200kW. Recommended values of C are from
1000pF to 100mF.
Triangle Wave Generation
The circuits of Figure 11 and Figure 12 can be converted
to triangle wave generation, by simply open-circuiting Pin
Frequency Sweep and Modulation:
13 and 14 (i.e., S open). Amplitude of the triangle is
Frequency of oscillation is proportional to the total timing
1
approximately twice the sine wave output.
current, I , drawn from Pin 7 or 8:
T
320IT (mA)
f +
Hz
FSK Generation
C(mF)
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,
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 1mA to 3mA. The frequency can be
R
1
and R ; the output is phase-continuous during
2
transitions. The keying signal is applied to Pin 9. The
circuit can be converted to split-supply operation by
simply replacing ground with V .
controlled by applying a control voltage, V , to the
activated timing pin as shown inFigure 10. Thefrequency
of oscillation is related to VC as:
C
-
VC
ǒ1 – Ǔ
3
1
RC
R
RC
f +
ǒ
1 )
Ǔ
Hz
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%
where V is in volts. The voltage-to-frequency conversion
gain, K, is given as:
C
0.32
RCC
K + ēfńēVC + –
HzńV
to 99% by the choice of R and R . The values of R and
R should be in the range of 1kW to 2MW.
2
CAUTION: For safety operation of the circuit, IT should be
limited to ꢀ 3mA.
1
2
1
Rev. 1.03
11
XR-2206
Output Amplitude:
Maximum output amplitude is inversely proportional to
at Pin 1 is approximately 100kW. Output amplitude varies
the external resistor, R , connected to Pin 3 (see
linearly with the applied voltage at Pin 1, for values of dc
3
Figure 3). For sine wave output, amplitude is
bias at this pin, within 14 volts of V /2 as shown in
CC
approximately 60mV peak per kW of R ; for triangle, the
Figure 6. As this bias level approaches V /2, the phase
3
CC
peak amplitude is approximately 160mV peak per kW of
of the output signal is reversed, and the amplitude goes
through zero. This property is suitable for phase-shift
keying and suppressed-carrier AM generation. Total
dynamic range of amplitude modulation is approximately
55dB.
R . Thus, for example, R = 50kW would produce
3
3
approximately 13V sinusoidal output amplitude.
Amplitude Modulation:
CAUTION: AM control must be used in conjunction with a
Output amplitude can be modulated by applying a dc bias
and a modulating signal to Pin 1. The internal impedance
well-regulated supply, since the output amplitude now becomes
a function of V
.
CC
VR
V
CC
11
15 V2
5
14 16 6
13
1
3 2
V
CC
7
6
5
8
10
V
CC
VR
V1
4
VR
V1
V2
Int’nI.
Reg.
VR
9
12
Figure 15. Equivalent Schematic Diagram
Rev. 1.03
12
XR-2206
16 LEAD CERAMIC DUAL-IN-LINE
(300 MIL CDIP)
Rev. 1.00
16
9
8
1
E
E
1
D
A
1
Base
Plane
A
Seating
Plane
L
e
c
B
B
1
α
INCHES
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
A
0.100
0.015
0.014
0.045
0.008
0.740
0.250
0.200
0.060
0.026
0.065
0.018
0.840
0.310
2.54
0.38
0.36
1.14
0.20
18.80
6.35
5.08
1.52
0.66
1.65
0.46
21.34
7.87
A
B
B
c
1
1
D
E
E
e
L
1
0.300 BSC
0.100 BSC
7.62 BSC
2.54 BSC
0.125
0.200
3.18
5.08
α
0°
15°
0°
15°
Note: The control dimension is the inch column
Rev. 1.03
13
XR-2206
16 LEAD PLASTIC DUAL-IN-LINE
(300 MIL PDIP)
Rev. 1.00
9
8
16
1
E
1
E
D
A
2
A
L
Seating
Plane
C
α
A
1
B
e
B
e
A
B
1
e
INCHES
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
A
0.145
0.015
0.115
0.014
0.030
0.008
0.745
0.300
0.240
0.210
0.070
0.195
0.024
0.070
0.014
0.840
0.325
0.280
3.68
0.38
2.92
0.36
0.76
0.20
5.33
1.78
4.95
0.56
1.78
0.38
21.34
8.26
7.11
A
A
B
B
1
2
1
C
D
E
18.92
7.62
6.10
E
e
1
0.100 BSC
0.300 BSC
2.54 BSC
7.62 BSC
e
A
e
B
L
α
0.310
0.430
0.160
15°
7.87
10.92
4.06
15°
0.115
2.92
0°
0°
Note: The control dimension is the inch column
Rev. 1.03
14
XR-2206
16 LEAD SMALL OUTLINE
(300 MIL JEDEC SOIC)
Rev. 1.00
D
16
1
9
E
H
8
C
A
Seating
Plane
α
e
B
A
1
L
INCHES
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
A
0.093
0.004
0.013
0.009
0.398
0.291
0.104
0.012
0.020
0.013
0.413
0.299
2.35
0.10
0.33
0.23
2.65
0.30
0.51
0.32
10.50
7.60
A
B
1
C
D
E
e
10.10
7.40
0.050 BSC
1.27 BSC
H
L
0.394
0.419
0.050
10.00
0.40
10.65
1.27
0.016
α
0°
8°
0°
8°
Note: The control dimension is the millimeter column
Rev. 1.03
15
XR-2206
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to im-
prove design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits de-
scribed herein, conveys no license under any patent or other right, and makes no representation that the circuits are
free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary
depending upon a user’s specific application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly
affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation
receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the
user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circum-
stances.
Copyright 1972 EXAR Corporation
Datasheet June 1997
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Rev. 1.03
16
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