...the analog plus companyTM
XR-2206
Monolithic
Function Generator
FEATURES
Low-Sine Wave Distortion, 0.5%, Typical
Excellent Temperature Stability, 20ppm/°C, Typ.
Wide Sweep Range, 2000:1, Typical
Low-Supply Sensitivity, 0.01%V, Typ.
Linear Amplitude Modulation
TTL Compatible FSK Controls
June 1997-3
APPLICATIONS
Waveform Generation
Sweep Generation
AM/FM Generation
V/F Conversion
FSK Generation
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Wide Supply Range, 10V to 26V |
Phase-Locked Loops (VCO) |
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Adjustable Duty Cycle, 1% TO 99% |
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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-stability and 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 has a typical drift specification of 20ppm/°C. The oscillator frequency can be linearly swept over a 2000:1 frequency range with an external control voltage, while maintaining low distortion.
ORDERING INFORMATION
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Operating |
Part No. |
Package |
Temperature Range |
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XR-2206M |
16 Lead 300 Mil CDIP |
-55°C to +125°C |
XR-2206P |
16 Lead 300 Mil PDIP |
±40°C to +85°C |
XR-2206CP |
16 Lead 300 Mil PDIP |
0°C to +70°C |
XR-2206D |
16 Lead 300 Mil JEDEC SOIC |
0°C to +70°C |
Rev. 1.03
1972
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 (510) 668-7017
1
XR-2206
VCC |
GND |
BIAS |
4 |
12 |
10 |
11 SYNCO
TC1 |
5 |
Timing |
VCO |
Capacitor |
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TC2 |
6 |
TR1 |
7 |
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Timing |
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Resistors |
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Current |
Multiplier |
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Switches |
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TR2 |
8 |
And Sine |
+1 |
2 |
STO |
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Shaper |
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FSKI |
9 |
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AMSI |
1 |
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3 |
MO |
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WAVEA1 |
13 |
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WAVEA2 |
14 |
SYMA1 |
15 |
SYMA2 16
Figure 1. XR-2206 Block Diagram
Rev. 1.03
2
XR-2206
AMSI |
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SYMA2 |
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1 |
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16 |
AMSI |
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1 |
16 |
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SYMA2 |
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STO |
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SYMA1 |
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2 |
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15 |
STO |
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2 |
15 |
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SYMA1 |
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MO |
3 |
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14 |
WAVEA2 |
MO |
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3 |
14 |
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WAVEA2 |
VCC |
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WAVEA1 |
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4 |
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13 |
V |
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4 |
13 |
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WAVEA1 |
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TC1 |
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GND |
CC |
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5 |
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12 |
TC1 |
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5 |
12 |
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GND |
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TC2 |
6 |
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11 |
SYNCO |
TC2 |
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6 |
11 |
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SYNCO |
TR1 |
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BIAS |
TR1 |
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7 |
10 |
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BIAS |
TR2 |
7 |
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10 |
FSKI |
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FSKI |
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8 |
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9 |
TR2 |
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8 |
9 |
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16 Lead PDIP, CDIP (0.300º) |
16 Lead SOIC (Jedec, 0.300º) |
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PIN DESCRIPTION
Pin # |
Symbol |
Type |
Description |
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1 |
AMSI |
I |
Amplitude Modulating Signal Input. |
2 |
STO |
O |
Sine or Triangle Wave Output. |
3 |
MO |
O |
Multiplier Output. |
4 |
VCC |
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Positive Power Supply. |
5 |
TC1 |
I |
Timing Capacitor Input. |
6 |
TC2 |
I |
Timing Capacitor Input. |
7 |
TR1 |
O |
Timing Resistor 1 Output. |
8 |
TR2 |
O |
Timing Resistor 2 Output. |
9 |
FSKI |
I |
Frequency Shift Keying Input. |
10 |
BIAS |
O |
Internal Voltage Reference. |
11 |
SYNCO |
O |
Sync Output. This output is a open collector and needs a pull up resistor to VCC. |
12 |
GND |
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Ground pin. |
13 |
WAVEA1 |
I |
Wave Form Adjust Input 1. |
14 |
WAVEA2 |
I |
Wave Form Adjust Input 2. |
15 |
SYMA1 |
I |
Wave Symetry Adjust 1. |
16 |
SYMA2 |
I |
Wave Symetry Adjust 2. |
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Rev. 1.03
3
XR-2206
DC ELECTRICAL CHARACTERISTICS
Test Conditions: Test Circuit of Figure 2 Vcc = 12V, TA = 25°C, C = 0.01 F, R1 = 100k , R2 = 10k , R3 = 25k
Unless Otherwise Specified. S1 open for triangle, closed for sine wave.
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XR-2206M/P |
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XR-2206CP/D |
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Parameters |
Min. |
Typ. |
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Max. |
Min. |
Typ. |
Max. |
Units |
Conditions |
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General Characteristics |
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Single Supply Voltage |
10 |
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26 |
10 |
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26 |
V |
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Split-Supply Voltage |
+5 |
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+13 |
+5 |
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+13 |
V |
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Supply Current |
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12 |
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17 |
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14 |
20 |
mA |
R1 10k |
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Oscillator Section |
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Max. Operating Frequency |
0.5 |
1 |
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0.5 |
1 |
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MHz |
C = 1000pF, R1 = 1k |
Lowest Practical Frequency |
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0.01 |
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0.01 |
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Hz |
C = 50 F, R1 = 2M |
Frequency Accuracy |
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+1 |
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+4 |
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+2 |
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% of fo |
fo = 1/R1C |
Temperature Stability |
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+10 |
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+50 |
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+20 |
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ppm/°C |
0°C TA 70°C |
Frequency |
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R1 = R2 = 20k |
Sine Wave Amplitude Stability2 |
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4800 |
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4800 |
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ppm/°C |
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Supply Sensitivity |
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0.01 |
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0.1 |
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0.01 |
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%/V |
VLOW = 10V, VHIGH = 20V, |
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R1 = R2 = 20k |
Sweep Range |
1000:1 |
2000:1 |
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2000:1 |
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fH = fL |
fH @ R1 = 1k |
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fL @ R1 = 2M |
Sweep Linearity |
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10:1 Sweep |
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2 |
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2 |
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% |
fL = 1kHz, fH = 10kHz |
1000:1 Sweep |
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8 |
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8 |
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% |
fL = 100Hz, fH = 100kHz |
FM Distortion |
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0.1 |
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0.1 |
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+10% Deviation |
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Recommended Timing Components |
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Timing Capacitor: C |
0.001 |
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100 |
0.001 |
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100 |
F |
Figure 5 |
Timing Resistors: R1 & R2 |
1 |
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2000 |
1 |
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2000 |
k |
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Triangle Sine Wave Output1 |
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Figure 3 |
Triangle Amplitude |
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160 |
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160 |
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mV/k |
Figure 2, S1 Open |
Sine Wave Amplitude |
40 |
60 |
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80 |
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60 |
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mV/k |
Figure 2, S1 Closed |
Max. Output Swing |
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6 |
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6 |
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Vp-p |
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Output Impedance |
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600 |
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600 |
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Triangle Linearity |
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1 |
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1 |
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% |
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Amplitude Stability |
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0.5 |
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0.5 |
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dB |
For 1000:1 Sweep |
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Sine Wave Distortion |
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Without Adjustment |
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2.5 |
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2.5 |
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% |
R1 = 30k |
With Adjustment |
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0.4 |
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1.0 |
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0.5 |
1.5 |
% |
See Figure 7 and Figure 8 |
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Notes
1Output amplitude is directly proportional to the resistance, R3 , on Pin 3. See Figure 3.
2For 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
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XR-2206 |
DC ELECTRICAL CHARACTERISTICS (CONT'D) |
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XR-2206M/P |
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XR-2206CP/D |
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Parameters |
Min. |
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Typ. |
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Max. |
Min. |
Typ. |
Max. |
Units |
Conditions |
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Amplitude Modulation |
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Input Impedance |
50 |
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100 |
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50 |
100 |
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k |
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Modulation Range |
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100 |
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100 |
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% |
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Carrier Suppression |
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55 |
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55 |
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dB |
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Linearity |
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2 |
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2 |
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% |
For 95% modulation |
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Square-Wave Output |
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Amplitude |
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12 |
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12 |
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Vp-p |
Measured at Pin 11. |
Rise Time |
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250 |
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250 |
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ns |
CL = 10pF |
Fall Time |
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50 |
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50 |
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ns |
CL = 10pF |
Saturation Voltage |
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0.2 |
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0.4 |
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0.2 |
0.6 |
V |
IL = 2mA |
Leakage Current |
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0.1 |
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20 |
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0.1 |
100 |
A |
VCC = 26V |
FSK Keying Level (Pin 9) |
0.8 |
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1.4 |
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2.4 |
0.8 |
1.4 |
2.4 |
V |
See section on circuit controls |
Reference Bypass Voltage |
2.9 |
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3.1 |
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3.3 |
2.5 |
3 |
3.5 |
V |
Measured at Pin 10. |
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Notes
1Output amplitude is directly proportional to the resistance, R3 , on Pin 3. See Figure 3.
2For 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.
The VCO produces an output frequency proportional to an input current, which is set by a resistor from the timing
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.
Rev. 1.03
5
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