XR-2206
...the analog plus company
TM
Monolithic
Function Generator
June 1997-3
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)
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
Operating
Temperature Range
-55
°
C to +125
°
C
–40
°
C to +85
°
C
0
°
C to +70
°
C
0
°
C to +70
°
C
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
Rev. 1.03
E1972
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
(510) 668-7017
1
XR-2206
V
CC
4
TC1
Timing
Capacitor
TC2
6
5
VCO
GND
12
BIAS
10
11 SYNCO
Timing
Resistors
TR1
7
Current
Switches
Multiplier
And Sine
Shaper
TR2
FSKI
AMSI
8
9
1
+1
2
STO
3
MO
WAVEA1 13
WAVEA2 14
SYMA1 15
SYMA2 16
Figure 1. XR-2206 Block Diagram
Rev. 1.03
2
XR-2206
AMSI
STO
MO
V
CC
TC1
TC2
TR1
TR2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SYMA2
SYMA1
WAVEA2
WAVEA1
GND
SYNCO
BIAS
FSKI
AMSI
STO
MO
V
CC
TC1
TC2
TR1
TR2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SYMA2
SYMA1
WAVEA2
WAVEA1
GND
SYNCO
BIAS
FSKI
16 Lead PDIP, CDIP (0.300”)
16 Lead SOIC (Jedec, 0.300”)
PIN DESCRIPTION
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
AMSI
STO
MO
V
CC
TC1
TC2
TR1
TR2
FSKI
BIAS
SYNCO
GND
WAVEA1
WAVEA2
SYMA1
SYMA2
I
I
I
I
I
I
O
O
I
O
O
Type
I
O
O
Description
Amplitude Modulating Signal Input.
Sine or Triangle Wave Output.
Multiplier Output.
Positive Power Supply.
Timing Capacitor Input.
Timing Capacitor Input.
Timing Resistor 1 Output.
Timing Resistor 2 Output.
Frequency Shift Keying Input.
Internal Voltage Reference.
Sync Output.
This output is a open collector and needs a pull up resistor to V
CC
.
Ground pin.
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
A
= 25°C, C = 0.01mF, R
1
= 100kW, R
2
= 10kW, R
3
= 25kW
Unless Otherwise Specified. S
1
open for triangle, closed for sine wave.
XR-2206M/P
Parameters
General Characteristics
Single Supply Voltage
Split-Supply Voltage
Supply Current
Oscillator Section
Max. Operating Frequency
Lowest Practical Frequency
Frequency Accuracy
Temperature Stability
Frequency
Sine Wave Amplitude Stability
2
Supply Sensitivity
Sweep Range
Sweep Linearity
10:1 Sweep
1000:1 Sweep
FM Distortion
Recommended Timing Components
Timing Capacitor: C
Timing Resistors: R
1
& R
2
Triangle Sine Wave Output
1
Triangle Amplitude
Sine Wave Amplitude
Max. Output Swing
Output Impedance
Triangle Linearity
Amplitude Stability
Sine Wave Distortion
Without Adjustment
With Adjustment
2.5
0.4
1.0
2.5
0.5
1.5
%
%
R
1
= 30kW
See
Figure 7
and
Figure 8
40
160
60
6
600
1
0.5
80
160
60
6
600
1
0.5
mV/kW
mV/kW
Vp-p
W
%
dB
For 1000:1 Sweep
0.001
1
100
2000
0.001
1
100
2000
mF
kW
2
8
0.1
2
8
0.1
%
%
%
f
L
= 1kHz, f
H
= 10kHz
f
L
= 100Hz, f
H
= 100kHz
+10% Deviation
0.5
1
0.01
+1
+10
4800
0.01
1000:1 2000:1
0.1
+4
+50
0.5
1
0.01
+2
+20
4800
0.01
2000:1
MHz
Hz
% of f
o
C = 1000pF, R
1
= 1kW
C = 50mF, R
1
= 2MW
f
o
= 1/R
1
C
10
+5
12
26
+13
17
10
+5
14
26
+13
20
V
V
mA
R
1
10kW
Min.
Typ.
Max.
XR-2206CP/D
Min.
Typ.
Max.
Units
Conditions
ppm/
°
C 0
°
C
T
A
70
°
C
R
1
= R
2
= 20kW
ppm/
°
C
%/V
f
H
= f
L
V
LOW
= 10V, V
HIGH
= 20V,
R
1
= R
2
= 20kW
f
H
@ R
1
= 1kW
f
L
@ R
1
= 2MW
Figure 5
Figure 3
Figure 2,
S
1
Open
Figure 2,
S
1
Closed
Notes
1
Output amplitude is directly proportional to the resistance, R , on Pin 3. See Figure 3.
3
2
For maximum amplitude stability, R should be a positive temperature coefficient resistor.
3
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
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
0.8
2.9
12
250
50
0.2
0.1
1.4
3.1
0.4
20
2.4
3.3
0.8
2.5
12
250
50
0.2
0.1
1.4
3
0.6
100
2.4
3.5
Vp-p
ns
ns
V
mA
V
V
Measured at Pin 11.
C
L
= 10pF
C
L
= 10pF
I
L
= 2mA
V
CC
= 26V
See section on circuit controls
Measured at Pin 10.
50
100
100
55
2
50
100
100
55
2
kW
%
dB
%
For 95% modulation
Min.
Typ.
Max.
XR-2206CP/D
Min.
Typ.
Max.
Units
Conditions
Notes
1
Output amplitude is directly proportional to the resistance, R , on Pin 3. See Figure 3.
3
2
For maximum amplitude stability, R should be a positive temperature coefficient resistor.
3
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
Rev. 1.03
5
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.
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