Datasheet XR-2206 Datasheet (EXAR)

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FEA TURES

 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, T yp.
 Linear Amplitude Modulation
 TTL Compatible FSK Controls
 Wide Supply Range, 10V to 26V
 Adjustable Duty Cycle, 1% TO 99%

GENERAL DESCRIPTION

TM

APPLICATIONS

 Waveform Generation
 Sweep Generation
 AM/FM Generation
 V/F Conversion
 FSK Generation
 Phase-Locked Loops (VCO)

Function Generator

XR-2206

Monolithic

June 1997-3

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.

ORDERING INFORMA TION

Part No. Package

XR-2206M 16 Lead 300 Mil CDIP

XR-2206P 16 Lead 300 Mil PDIP

XR-2206CP 16 Lead 300 Mil PDIP

XR-2206D 16 Lead 300 Mil JEDEC SOIC

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.

Operating

T emperature Range

-55°C to +125°C
–40°C to +85°C

0°C to +70°C
0°C to +70°C

Rev. 1.03

1972

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538  [phone]  [phone]

1

XR-2206

Timing

Capacitor

Timing

Resistors

FSKI

TC1

TC2

TR1

TR2

GND10BIAS

V

CC

12

4

5

VCO

6

7

Current

8

9

Switches

Multiplier
And Sine

Shaper

+1

11 SYNCO

2

STO

AMSI

1

13WAVEA1

14WAVEA2

15SYMA1

16SYMA2

3MO

Figure 1. XR-2206 Block Diagram

Rev. 1.03

2

XR-2206

STO

MO

V

CC

TC1
TC2
TR1

TR2

1
2
3
4
5
6
7
8

AMSI

16 Lead PDIP, CDIP (0.300”)

16
15
14
13
12
11
10
9

SYMA2
SYMA1
WAVEA2
WAVEA1
GND
SYNCO
BIAS

FSKI

161

AMSI

STO

MO

V

CC

TC1
TC2
TR1

TR2

2
3
4
5
6
7

SYMA2

15

SYMA1

14

WAVEA2

13

WAVEA1
GND

12
11

SYNCO

10

BIAS

98

FSKI

16 Lead SOIC (Jedec, 0.300”)

PIN DESCRIPTION

Pin # Symbol Type Description

1 AMSI I Amplitude Modulating Signal Input.
2 STO O Sine or Triangle Wave Output.
3 MO O Multiplier Output.
4 V

CC

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 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.

Positive Power Supply .

Rev. 1.03

3

XR-2206

DC ELECTRICAL CHARACTERISTICS

Test Conditions: Test Circuit of
Unless Otherwise Specified. S

Parameters Min. T yp. Max. Min. Typ. Max. Units Conditions

General Characteristics

Single Supply Voltage 10 26 10 26 V
Split-Supply Voltage
Supply Current 12 17 14 20 mA

Oscillator Section

Max. Operating Frequency 0.5 1 0.5 1 MHz
Lowest Practical Frequency 0.01 0.01 Hz
Frequency Accuracy +1 +4 +2 % of fofo = 1/R1C
Temperature Stability

Frequency
Sine Wave Amplitude Stability
Supply Sensitivity 0.01 0.1 0.01 %/V V

Sweep Range 1000:1 2000:1 2000:1 fH = f

Sweep Linearity

10:1 Sweep 2 2 % fL = 1kHz, f
1000:1 Sweep 8 8 % f
FM Distortion 0.1 0.1 % +10% Deviation

Recommended Timing Components

Timing Capacitor: C 0.001 100 0.001 100
Timing Resistors: R1 & R

Triangle Sine Wave Output

Triangle Amplitude 160 160
Sine Wave Amplitude 40 60 80 60
Max. Output Swing 6 6 Vp-p
Output Impedance 600 600
Triangle Linearity 1 1 %
Amplitude Stability 0.5 0.5 dB For 1000:1 Sweep

Sine Wave Distortion

Without Adjustment 2.5 2.5 %
With Adjustment 0.4 1.0 0.5 1.5 % See

2

Figure 2

open for triangle, closed for sine wave.

1

Vcc = 12V, TA = 25°C, C = 0.01F, R

XR-2206M/P XR-2206CP/D

+5

+13 +5 +13 V

+10 +50 +20

2

4800 4800

1 2000 1 2000

1

= 100k, R2 = 10k, R3 = 25k

1

R

 10k

1

C = 1000pF, R1 = 1k
C = 50F, R

ppm/°C 0°C  T

R

= R2 = 20k

1

1

 70°C

A

= 2M

ppm/°C

= 10V, V

LOW

= R

= 20k

1

2

@ R1 = 2M

= 10kHz

H

= 100Hz, fH = 100kHz

L

F

R
fH @ R1 = 1k

f

L

L

Figure 5

k

Figure 3

mV/k
mV/k

Figure 2,
Figure 2

S1 Open

, S1 Closed



R1 = 30k

Figure 7

and

HIGH

Figure 8

= 20V,

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 50 100 50 100
Modulation Range 100 100 %
Carrier Suppression 55 55 dB
Linearity 2 2 % For 95% modulation

Square-Wave Output

Amplitude 12 12 Vp-p Measured at Pin 11.
Rise Time 250 250 ns CL = 10pF
Fall Time 50 50 ns CL = 10pF
Saturation Voltage 0.2 0.4 0.2 0.6 V IL = 2mA
Leakage Current 0.1 20 0.1 100
FSK Keying Level (Pin 9) 0.8 1.4 2.4 0.8 1.4 2.4 V See section on circuit controls
Reference Bypass Voltage 2.9 3.1 3.3 2.5 3 3.5 V Measured at Pin 10.

k

A

V

= 26V

CC

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. . . . . . . . . . . . . . . . . . . . . . .

Total Timing Current 6mA. . . . . . . . . . . . . . . . . . . . . . . .

Storage Temperature -65°C to +150°C. . . . . . . . . . . .

Derate Above 25°C 5mW/°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

XR-2206

V

CC

1mF

FSK Input

R1
R2

1
5

C

6
9

7
8

VCO

Current

Switches

V

CC

4

Mult.

And

Sine

Shaper

10 12

1mF

5.1K 5.1K

3

+1

R3

25K

+

Symmetry Adjust

16

25K

15
14

S

13

2

11

XR-2206

1mF

1

THD Adjust

500

V

CC

10K

= Open For Triangle

S

1

= Closed For Sinewave

Triangle Or
Sine Wave
Output

Square Wave
Output

Figure 2. Basic Test Circuit

6

Triangle

5

4

3

2

1

Peak Output Voltage (Volts)

0 20 40 60 80 100

R3 in (KW)

Figure 3. Output Amplitude

as a Function of the Resistor,

R3, at Pin 3

Rev. 1.03

Sinewave

26

22

1KW

18

(mA)

I

CC

14

10

10KW

30KW

812 16 20 24 28

2K

V

CC

W

(V)

70°C Max.
Package
Dissipation

Figure 4. Supply Current vs

Supply Voltage, Timing, R

6

XR-2206

()

100K

Timing Resistor W

10M

10K

1M

MINIMUM TIMING R

1K

-2

10

MAXIMUM TIMING R

NORMAL RANGE

TYPICAL VALUE

10 10

2

10

4

Figure 5. R versus Oscillation Frequency.

10

4V 4V

1.0

0.5

Normal Output Amplitude

0

6

DC Voltage At Pin 1Frequency (Hz)

V

/ 2

CC

Figure 6. Normalized Output Amplitude
versus DC Bias at AM Input (Pin 1)

5

4

3

2

Distortion (%)

1

0

1.0

C = 0.01mF
Trimmed For Minimum
Distortion At 30 KW

10

Timing R K(W)

100

Figure 7. Trimmed Distortion versus

Timing Resistor.

10

5

4

3

Distortion (%)

2

1

3

0

10 100 1K 10K 100K 1M

R=3KW

=0.5VRMS Pin 2V

OUT

RL=10KW

Frequency (Hz)

Figure 8. Sine Wave Distortion versus

Operating Frequency with

Timing Capacitors Varied.

Rev. 1.03

7

XR-2206

3

C=0.01F

2

1

0

-1

Frequency Drift (%)

-2

-3

-50 -25 0 25 50 75 125

R=1M

R=200K

R=10K

R=2K
R=1K

Ambient Temperature (C°)

R=200K

R=10K

R=1K

R=2K

R=1M

100

Sweep

Input

I

I

Rc

+

V

C

-

T

C

R

Pin 7
or 8

I

B

+

3V

-

12

Figure 9. Frequency Drift versus

Temperature.

1

5

C

6
9

7

2M

R

1

R

1K

8

V

VCO

Current

Switches

CC

V

CC

4

10 1 2

+

1F

5.1K 5.1K

Figure 10. Circuit Connection for Frequency Sweep.

1F

16

Mult.

And

Sine

Shaper

3

R

50K

15
14

13

+1

3

2

11

XR-2206

+

10F

S1 Closed For Sinewave

S

1

200

10K

V

CC

Triangle Or
Sine Wave Output

Square Wave
Output

Rev. 1.03

Figure 11. Circuit tor Sine Wave Generation without External Adjustment.

(See

Figure 3

for Choice of R3)

8

F =

2M

1

RC

XR-2206

V

CC

1F

1

5

VCO

C

6
9

7

Current

8

R

1K

1

R

Switches

V

CC

4

Mult.

And

Sine

Shaper

112

0

+

1F

5.1K 5.1K

3

R

50K

+1

3

+

Symmetry Adjust

16

25K

15
14

S

1

13

2

11

XR-2206

10F

V

R

500

CC

B

S

Closed For Sinewave

1

R

A

Triangle Or
Sine Wave Output

Square Wave
Output

10K

Figure 12. Circuit for Sine Wave Generation with Minimum Harmonic Distortion.

(R

>2V
<1V

FSK Input

F

1

F

2

Determines Output Swing - See

3

V

CC

4

Mult.

And

Sine

Shaper

10 12

+

1F

5.1K 5.1K

R
R

F1=1/R1C
F2=1/R2C

1

5

C

VCO

6
9

7

1
2

8

Current

Switches

V

CC

1F

3

R

50K

3

+1

+

Figure 3

16
15
14

13

2

11

XR-2206

10F

)

200

FSK Output

Rev. 1.03

Figure 13. Sinusoidal FSK Generator

9

XR-2206

V

CC

2

1



f

1F

1
5

C

R

1

R

2

6
9

7
8

VCO

Current

Switches

V

CC

4

Shaper

10 12

+

1F

5.1K 5.1K

Mult.

And
Sine

3

R

24K

3

+1

XR-2206

+

10F

16

15
14

13

2

11

5.1K

V

Duty Cycle =

CC



R

C

R

Sawtooth Output
Pulse Output





R

1

2

R

1



R

1

2

Figure 14. Circuit for Pulse and Ramp Generation.

Frequency-Shift Keying

The XR-2206 can be operated with two separate timing
resistors, R
respectively, as shown in

and R2, connected to the timing Pin 7 and 8,

1

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

is activated. Similarly, if the voltage level at Pin 9 is

R

1

1V , only R
be keyed between two levels. f

f

= 1/R1C and f2 = 1/R2C

1

is activated. Thus, the output frequency can

2

and f2, as:

1

For split-supply operation, the keying voltage at Pin 9 is

-

referenced to V

.

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 13

, Pin 3 is biased midway between V+ and

ground, to give an output dc level of  V

Figure 11, Figure 12

+

/2.

and

APPLICATIONS INFORMATION

Sine Wave Generation

Without External Adjustment

Figure 11

shows the circuit connection for generating a

sinusoidal output from the XR-2206. The potentiometer,

at Pin 7, provides the desired frequency tuning. The

R

1

maximum output swing is greater than V

+

/2, and the
typical distortion (THD) is < 2.5%. If lower sine wave
distortion is desired, additional adjustments can be
provided as described in the following section.

The circuit of

Figure 11

can be converted to split-supply

operation, simply by replacing all ground connections

-

with V

. For split-supply operation, R3 can be directly

connected to ground.

Rev. 1.03

10

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.

sine-shaping resistor, and R
adjustment for the waveform symmetry. The adjustment
procedure is as follows:

1. Set R

2. With R

Triangle Wave Generation

The circuits of
to triangle wave generation, by simply open-circuiting Pin
13 and 14 (i.e., S
approximately twice the sine wave output.

The potentiometer, RA, adjusts the

provides the fine

B

at midpoint and adjust RA for minimum

B

distortion.

set as above, adjust RB to further reduce

A

distortion.

Figure 11

and

Figure 12

open). Amplitude of the triangle is

1

can be converted

PRINCIPLES OF OPERA TION

Description of Controls

Frequency of Operation:

The frequency of oscillation, f
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:

f

+

0

and can be adjusted by varying either R or C. The
recommended values of R, for a given frequency range,
as shown in
for 4k < R < 200k. Recommended values of C are from
1000pF to 100F.

Frequency Sweep and Modulation:

Frequency of oscillation is proportional to the total timing
current, I

Figure 5.

, drawn from Pin 7 or 8:

T

Temperature stability is optimum

, is determined by the

o

1

Hz

RC

FSK Generation

Figure 13

signal operation. Mark and space frequencies can be
independently adjusted by the choice of timing resistors,
R

and R2; the output is phase-continuous during

1

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

Figure 14

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 R
R

2

shows the circuit connection for sinusoidal FSK

shows the circuit for pulse and ramp waveform

and R2. The values of R1 and

1

should be in the range of 1k to 2M.

I

(mA)

320

1 )

V

C(F)

+

C

T

R

ǒ

R

C

–

Hz

Figure 10.

V

C

1

0.32

RCC

Ǔ

–

3

HzńV

, to the

C

The frequency

Ǔ

Hz

f

+

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 1A to 3mA. The frequency can be
controlled by applying a control voltage, V
activated timing pin as shown in
of oscillation is related to VC as:

1

RC

K

+ēfńē

ǒ

f

+

where V
gain, K, is given as:

CAUTION: For safety operation of the circuit, IT should be
limited to

is in volts. The voltage-to-frequency conversion

C



3mA.

Rev. 1.03

11

XR-2206

Output Amplitude:

Maximum output amplitude is inversely proportional to
the external resistor, R

Figure 3

). For sine wave output, amplitude is

approximately 60mV peak per k of R

, connected to Pin 3 (see

3

; for triangle, the

3

peak amplitude is approximately 160mV peak per k of

. Thus, for example, R

R

3

= 50k would produce

3

approximately 13V sinusoidal output amplitude.

Amplitude Modulation:

Output amplitude can be modulated by applying a dc bias
and a modulating signal to Pin 1. The internal impedance

CC

at Pin 1 is approximately 100k. Output amplitude varies
linearly with the applied voltage at Pin 1, for values of dc
bias at this pin, within 14 volts of V

Figure 6.

As this bias level approaches VCC/2, the phase

/2 as shown in

CC

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.

CAUTION: AM control must be used in conjunction with a
well-regulated supply , since the output amplitude now becomes
a function of V

CC

6161451311VR V215V

.

21

3

7
6
5

8
10
VR
V1

VR

9

Rev. 1.03

V

CC

4

Int’nI.
Reg.

12

VR
V1
V2

Figure 15. Equivalent Schematic Diagram

V

CC

12

16 LEAD CERAMIC DUAL-IN-LINE

(300 MIL CDIP)

Rev. 1.00

XR-2206

Base

Plane

Seating

Plane

16

18

D

A

1

L

e

B

INCHES MILLIMETERS

SYMBOL MIN MAX MIN MAX

A 0.100 0.200 2.54 5.08
A

1

B 0.014 0.026 0.36 0.66
B

1

c 0.008 0.018 0.20 0.46
D 0.740 0.840 18.80 21.34
E

1

E 0.300 BSC 7.62 BSC
e 0.100 BSC 2.54 BSC
L 0.125 0.200 3.18 5.08

0.015 0.060 0.38 1.52

0.045 0.065 1.14 1.65

0.250 0.310 6.35 7.87

9

B

1

A

α 0° 15° 0° 15°

Note: The control dimension is the inch column

E

E

1

c

α

Rev. 1.03

13

XR-2206

16 LEAD PLASTIC DUAL-IN-LINE

(300 MIL PDIP)

Rev. 1.00

Seating

Plane

16

1

D

A
L

B

SYMBOL MIN MAX MIN MAX

A 0.145 0.210 3.68 5.33
A

1

A

2

B 0.014 0.024 0.36 0.56
B

1

C 0.008 0.014 0.20 0.38
D 0.745 0.840 18.92 21.34
E 0.300 0.325 7.62 8.26
E

1

e 0.100 BSC 2.54 BSC
e

A

e

B

L 0.115 0.160 2.92 4.06
α 0° 15° 0° 15°

e

INCHES

0.015 0.070 0.38 1.78

0.115 0.195 2.92 4.95

0.030 0.070 0.76 1.78

0.240 0.280 6.10 7.11

0.300 BSC 7.62 BSC

0.310 0.430 7.87 10.92

9
8

B

1

E

1

A

2

A

1

MILLIMETERS

E

α

e

A

e

B

C

Rev. 1.03

Note: The control dimension is the inch column

14

16 LEAD SMALL OUTLINE

(300 MIL JEDEC SOIC)

D

16 9

1

XR-2206

Rev. 1.00

E H

8

Seating
Plane

C

e

SYMBOL MIN MAX MIN MAX

A 0.093 0.104 2.35 2.65
A

1

B 0.013 0.020 0.33 0.51
C 0.009 0.013 0.23 0.32
D 0.398 0.413 10.10 10.50
E 0.291 0.299 7.40 7.60
e 0.050 BSC 1.27 BSC
H 0.394 0.419 10.00 10.65
L 0.016 0.050 0.40 1.27

α 0

Note: The control dimension is the millimeter column

B

A

1

INCHES MILLIMETERS

0.004 0.012 0.10 0.30

° 8° 0° 8°

A

α

L

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 im­prove design, performance or reliability . EXAR Corporation assumes no responsibility for the use of any circuits de­scribed 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 circum­stances.

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

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