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PDF 2206CP Data sheet ( Hoja de datos )
| Número de pieza | 2206CP | |
| Descripción | XR-2206 | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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...the analog plus companyTM
XR-2206
Monolithic
Function Generator
FEATURES
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 TTL Compatible FSK Controls
D Wide Supply Range, 10V to 26V
D Adjustable Duty Cycle, 1% TO 99%
APPLICATIONS
D Waveform Generation
D Sweep Generation
D AM/FM Generation
D V/F Conversion
D FSK Generation
D Phase-Locked Loops (VCO)
June 1997-3
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
Part No.
XR-2206M
XR-2206P
XR-2206CP
XR-2206D
Package
16 Lead 300 Mil CDIP
16 Lead 300 Mil PDIP
16 Lead 300 Mil PDIP
16 Lead 300 Mil JEDEC SOIC
Operating
Temperature Range
-55°C to +125°C
–40°C to +85°C
0°C to +70°C
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
1 page  
XR-2206
DC ELECTRICAL CHARACTERISTICS (CONT’D)
Parameters
Amplitude Modulation
Input Impedance
Modulation Range
Carrier Suppression
Linearity
Square-Wave Output
Amplitude
Rise Time
Fall Time
Saturation Voltage
Leakage Current
FSK Keying Level (Pin 9)
Reference Bypass Voltage
XR-2206M/P
XR-2206CP/D
Min. Typ. Max. Min. Typ. Max. Units Conditions
50 100
100
55
2
50 100
100
55
2
kW
%
dB
% For 95% modulation
12 12 Vp-p Measured at Pin 11.
250 250 ns CL = 10pF
50 50 ns CL = 10pF
0.2 0.4
0.2 0.6
V IL = 2mA
0.1 20
0.1 100
mA VCC = 26V
0.8 1.4 2.4 0.8 1.4 2.4
V See section on circuit controls
2.9 3.1 3.3 2.5 3 3.5 V Measured at Pin 10.
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.
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
5 Page 
XR-2206
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, RA, adjusts the
sine-shaping resistor, and RB provides the fine
adjustment for the waveform symmetry. The adjustment
procedure is as follows:
1. Set RB at midpoint and adjust RA for minimum
distortion.
2. With RA set as above, adjust RB to further reduce
distortion.
Triangle Wave Generation
The circuits of Figure 11 and Figure 12 can be converted
to triangle wave generation, by simply open-circuiting Pin
13 and 14 (i.e., S1 open). Amplitude of the triangle is
approximately twice the sine wave output.
PRINCIPLES OF OPERATION
Description of Controls
Frequency of Operation:
The frequency of oscillation, fo, 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:
f0 +
1
RC
Hz
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.
Frequency Sweep and Modulation:
Frequency of oscillation is proportional to the total timing
current, IT, drawn from Pin 7 or 8:
FSK Generation
f
+
320IT (mA)
C(mF)
Hz
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,
R1 and R2; 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
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
controlled by applying a control voltage, VC, to the
activated timing pin as shown in Figure 10. The frequency
of oscillation is related to VC as:
ǒ ǒ ǓǓf
+
1
RC
1
)
R
RC
1
–
VC
3
Hz
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%
to 99% by the choice of R1 and R2. The values of R1 and
R2 should be in the range of 1kW to 2MW.
where VC is in volts. The voltage-to-frequency conversion
gain, K, is given as:
K
+
ēfńēVC
+
–
0.32
RCC
HzńV
CAUTION: For safety operation of the circuit, IT should be
limited to 3mA.
Rev. 1.03
11
11 Page | ||
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