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`Exhibit 1037 - Page 1 of 7
`
`IPR2023-00993 - Exhibit 1037
`
`Exhibit 1037 - Page 1 of 7
`
`

`

`Ze EXAR
`
`
`
`
`TABLE OF CONTENTS
`Introduction B
`
`Standard Products
`
`Custom/Semi-Custom Products
`
`Application Notes
`
`Quality Assurance
`GeneralInformation
`
`EXAR Corporation
`750 Palomar Avenue
`Sunnyvale, CA 94086
`Telephone (408) 732-7970
`TWX:910-339-9233
`
`
`
`|
`
`
`
`Exhibit 1037 - Page 2 of 7
`
`Exhibit 1037 - Page 2 of 7
`
`

`

`Disclaimer
`
`Exar reservesthe right to make changesin the products containedin this book in order to improve design or perform-
`ance and to supply the best possible products. Exar also assumes no responsibility for the use of any circuits de-
`scribed herein, conveys no license under any patent or other right, and makes no representations that the circuits are
`free from patent infringement. Applications for any integrated circuits contained in this publication are for illustration
`purposes only and Exar makes no representation or warranty that such applicationswill be suitable for the use speci-
`fied without further testing or modification. Reproduction of any portion hereof without the prior written consent of
`Exar is prohibited.
`
`Third printing - September 1985
`
`EZ” EXAR
`
`750 Palomar Avenue
`Sunnyvale, CA 94086 ©
`Telephone (408) 732-7970
`TWX; 910-339-9233
`
`Exhibit 1037 - Page 3 of 7
`
`Exhibit 1037 - Page 3 of 7
`
`

`

`he EXAR
`
`
`
`~-XR-8038
`
`Precision Waveform Generator
`
`| GENERAL DESCRIPTION
`
`The XR-8038 is a precision waveform generator IC ca-
`‘‘pable of producing sine, square, triangular, sawtooth
`_.and pulse waveforms with a minimum number of exter-
`fal components and adjustments.
`Its operating fre-
`: quency can be selected over nine decadesof frequen-
`“cy, from 0.001 Hz to 1 MHz bythe choiceof external R-
`_ C components. The frequency of oscillation is highly
`‘ stable over a wide range of temperature and supply
`_ voltage changes. The frequency control, sweep and
`: modulation can be accomplished with an external con-
`: trol voltage, without affecting the quality of the output
`‘waveforms. Each of the three basic waveforms, i.e.,
`: sinewave, triangle and square wave outputsare avail-
`vable simultaneously, from independent output
`termi-
`| nals.
`
`~
`
`:The XR-8038 monolithic waveform generator uses ad-
`: vanced processing technology and Schottky-barrier di-
`' odes to enhance its frequency performance.It can be
`_ readily interfaced with a monolithic phase-detectorcir-
`- cuit, such as the XR-2208, to form stable phase-locked
`. loop circuits.
`
`- FEATURES
`
`FUNCTIONAL BLOCK DIAGRAM
`
`ORDERING INFORMATION
`
`Part Number
`XR-8038M
`XR-8038N
`XR-8038P
`XR-8038CN
`XR-8038CP
`
`Package
`Ceramic
`Ceramic
`Plastic
`Ceramic
`Plastic
`
`Operating Temperature
`— 55°C to +125°C
`0°C to +70°C
`0°C to +70°C
`0°C to +70°C
`- 0°C to +70°C
`
`SYSTEM DESCRIPTION
`
`
`
`
`
`
`
`
`Unadjusted sine wave distortion is typically less than
`0.7%, with Pin 1 open and 8 kQ from Pin 12 to Pin 11
`(-VeEE or ground). Sine wave distortion may be im-
`proved by including two 100 k2 potentiometers be-
`tween Voo and Veg (or ground), with one wiper con-
`nected to Pin 1 and the other connected to Pin 12.
`
`Frequency sweeping or FM is accomplished by apply-
`ing modulation to Pins 7 and 8 for small deviations, or
`only to Pin 8 for large shifts. Sweep range typically ex-
`ceeds 1000:1.
`
`The square waveoutput is an open collector transistor;
`output amplitude swing closely approaches the supply
`voltage. Triangle output amplitudeis typically 1/3 of the
`supply, and sine wave output reaches 0.22 Vs.
`
`1-213
`
`The XR-8038 precision waveform generator produces
`, Direct Replacement for Intersil 8038
`highly stable and sweepabie square,triangle’and sine
`» Low Frequency Drift—50 ppm/°C Max.
`waves across nine frequency decades. The device
`: Simultaneous Sine, Triangle and Square-Wave Outputs
`time base employs resistors and a capacitor for fre-
`‘ Low Distortion—THD = 1%
`quency and duty cycle determination. The generator
`: High FM and Triangle Linearity
`contains dual comparators,aflip-flop driving a switch,
`:.Wide Frequency Range—0.001 Hz to 1 MHz
`current sources, a buffer amplifier and a sine wave
`Variable Duty-Cycle—2% to 98%
`converter. Three identical frequency waveformsaresi-
`multaneously available. Supply voltage can range from
`10V to 30V, or +5V with dual supplies.
`
`- APPLICATIONS
`‘ Precision Waveform Generation Sine, Triangle, Square,
`:
`Pulse
`; Sweep and FM Generation
`: Tone Generation
`j Instrumentation and Test Equipment Design
`= Precision PL. Design
`"ABSOLUTE MAXIMUM RATINGS
`i Power Supply
`: PowerDissipation (package limitation)
`i Ceramic package
`Derate above +25°C
`Plastic package
`Derate above +25°C
`Storage Temperature Range
`
`36V
`
`750 mW
`6.0 mW/°G
`625 mW
`5 mW/°C
`-65°C to +150°C
`
`Exhibit 1037 - Page 4 of 7
`
`Exhibit 1037 - Page 4 of 7
`
`

`

`
`
`
`XR-8038
`
`ELECTRICAL CHARACTERISTICS
`Test Conditions: Vs = +5V to +15V, Ta = 25°C, RL = 1 MQ, Ra = Rg = 10 kf, Cy = 3300 pF, S4 closed,
`unless otherwise specified. See Test Circuit of Figure 1.
`
`eres
`
` XR-8038C
`XR-8038M/XR-8038/
`TYP MAX |UNITS
`MIN
`TYP MAX {MIN
`PARAMETERS
`GENERAL CHARACTERISTICS
`
`Supply Voltage, Vs
`Single Supply
`Dual Supplies
`
`= +10V. See Note 1.
`
`
`
`
`
`
`
`
`errs Current
`eae of Adjustment
`
`
`
`Max. Operating Frequency
` Ra = Rg = 5009, Cy = 0,
`
`RL = 15 kf
`
` Lowest Practical Frequency
`Ra = Rp = 1 Ma, Cy =
`
`500 pF
`
`
`
`Max. FM Sweep Frequency
`
`
`
`FM Sweep Range
`S41 Open. See Notes 2 and 3.
`
`
`FM Linearity-
`S1 Open. See Note 3.
`
`
`Range of Timing Resistors
`Values of Ra and Rg
`
`
`Temperature Stability
`
`XR-8038M
`XR-8038
`
`XR-8038C
`
`Power Supply Stability
`
`
`
`OUTPUT CHARACTERISTICS
`
`Measured at Pin 9.
`Square-Wave
`
`
`
`Ry = 100 kQ
`Amplitude
`
`
`
`Saturation Voltage
`lsink = 2mA
`
`
`
`RL = 4.7 kQ
`Rise Time
`
`
`
`RL = 4.7 ka
`Fall Time
`
`
`
`Duty Cycle Adj.
`
`
`
`
`Triangle/Sawtooth/Ramp
`MeasuredatPin 3.
`Ry = 100 ka
`- Amplitude
`
`
`Linearity
`
`Output Impedance
`lout =5mA
`
`
`
`
`Sine-Wave Amplitude
`RL = 100 ka
`Distortion
`
` RL = 1 MQ.See Note 5.
`" Unadjusted
`
`
`Adjusted
`
`Note 1: Currents through Ra ad Rp notincluded.
`Note 2: Vg = 20V, f = 10 kHz, Ra = Rp = 10k2.
`Note 3: Apply sweep voltage at Pin 8.
`(2/3 Vs +2V)s Vswee s Vs
`Note 4; 10V <= Vs = 30Vor +5V = Vs = +15V.
`Note 5: 81 kQ resistor connected between Pins 11
`/and12,
`©
`
`RL = 1Ma
`
`
`
`Figure 1. Generalized Test Circult
`
`1-214
`
`Exhibit 1037 - Page 5 of 7
`
`Exhibit 1037 - Page 5 of 7
`
`

`

`
`
`oe
`
`DISTORTION-%
`
`a
`
`UNADJUSTED
`
`ADJUSTED eeeNOHz
`
`Tt
`
`s
`10
`5
`20
`a
`30
`
`1OOHz=TkHz =VOkKHe 100kH2 IMHg
`
`
`
`CHARACTERISTIC CURVES
`
`
`
`TTY
` NOAMALIZEOFREQUENCY
` 15
`CoE
`ee
`
`CoeCe
` 10
`
`
`
`CUARENTCONSUMPTION
`
`1 aw
`
`
`
`
`
`
`
`
`
`
`
`Supply Voltage
`Supply Voltage
`Sinewave THD vs. Frequency
`Power Dissipation vs. Supply Voltage=Frequency Drift vs. Power Supply
`
`Cx 1/3 x V,
`R
`or,
`if Ra = Rg =
`ty = RV.VMUMNOE AK SRA x
`|
`5 x Voc
`3
`f = 0,3/RC (for Figure 2a)
`
`WAVEFORM ADJUSTMENT
`
`The symmetry of all waveforms can be adjusted with,
`the external timing resistors. Two possible ways to ac-
`complish this are shown in Figure 2. Best results are
`obtained by keeping the timing resistors Ra and Rp
`separate (a). RA controls the rising portion of the trian-
`gle and sine-wave and the “Low”state of the square
`wave.
`
`The magnitude of the triangle waveform is set at 1/3
`Voc; therefore, the duration of the rising portion of the
`triangle is:
`
`slightly more convenient. If no adjustment of the duty
`cycle is desired, terminals 4 and 5 can be shorted to-
`gether, as shownin Figure 2c. This connection, how-
`ever, carries an inherently larger variation of the duty-
`cycle.
`
`With two separate timing resistors, the frequency is
`given by
`
`‘fs
`
`
`1
`_ HM
`t+ t2 Spac(1 +
`
`3
`
`RB
`
`2Ra — Rp
`
`The duration of the falling portion of the triangle and the
`sinewave, and the “High” state of the square-waveis:
`
`CxV_
`|
`
`Cc x 13Vcc =x RARBG
`2, vec _1,,Yec
`3
`2Ra —- RB
`5
`Rep
`5
`RA
`Thus a 50%duty cycle is achieved when Ra = Re.
`
`If the duty-cycle is to be varied over a small range
`about 50% only, the connection shownin Figure 2b is
`
`frequencyis
`
`Ifa single timing resistor is used (Figures 2b andde), the
`f= 0.15/RC
`
`.
`
`The frequency of oscillation is independent of supply
`voltage, even though noneof the voitages are regulated
`inside the integrated circuit. This is due to the fact that
`both currents and thresholds are direct, linear function
`of the supply voltage and thus their effects cancel.
`
`
`
`O Vee
`
`O -VorGND
`
`Figure 2. Possible Connections for the External Timing Resistors.
`
`Exhibit 1037 - Page 6 of 7
`
`Exhibit 1037 - Page 6 of 7
`
`

`

`
`
`
`
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`
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`
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`
`
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`
`
`
`
`XR-8038
`
`DISTORTION ADJUSTMENT
`
`To minimize sine-wave distortion the 81 kQ resistor be-
`tween pins 11 and 12 is best made a variable one. With
`this arrangementdistortion of less than 1% is achieva-
`ble. To reducethis even further, two potentiometers can
`be connected as shownin Figure 3. This configuration
`allows a reduction of sine-wave distortion close to
`
`0.5%
`
`Figure 3, Connection te Achieve Minimum Sine-Wave Distortion.
`SELECTING TIMING COMPONENTS
`
`For any given output frequency,there is a wide range of
`RC combinations that will work. However certain con-
`straints are placed upon the magnitude of the charging
`current for optimum performance. At the low end, cur-
`rents of less than 0.1 »A are undesirable becausecir-
`cuit leakages will contribute significant errors at high
`temperatures. At higher currents (1 > 5 mA), transistor
`betas and saturation voltages will contribute increas-
`ingly larger errors. Optimum performance will be ob-
`tained for charging currents of 1 » to 1 mA.If pins 7 and
`8 are shorted together the magnitude of the charging
`current due to Ra can be calculated from:
`
`Fl ¥6G «J YO
`(Ry + Ro)
`Ra
`SRA
`
`A similar calculation holds for Rp.
`
`SINGLE-SUPPLY AND SPLIT-SUPPLY OPERATION
`
`The waveform generator can be operated either from a
`single power-supply (10 to 30 Volts) or a dual power-
`supply (+5 to +15 Volts). With a single power-supply
`the average levels of the triangle and sine-wave are at
`exactly one-half of the supply voitage, while the square-
`wave alternates between. +Vcc and ground. A split
`power supply has the advantage that all waveforms
`move symmetrically about ground.
`
`The square-wave output is not committed. A load resis-
`tor can be connected to a different power-supply, as
`long as the applied voltage remains within the break-
`downcapability of the waveform generator (30V). In this
`way, the square-wave output will be TTL compatible
`
`(load resistor connected to +5 Volts) while the wave-
`form generator itself is powered from a higher supply
`voltage.
`
`FREQUENCY MODULATION AND SWEEP
`
`The frequency of the waveform generator is a direct
`function of the DC voltage at terminal 8 (measured from
`+Vcc). By altering this voltage, frequency modulation
`is performed.
`
`For small deviations (e.g., + 10%) the modulating sig-
`nal can be applied directly to pin 8 by merely providing
`ac coupling with a capacitor, as shownin Figure 4a, An
`external resistor between pins 7 and 8 is not necessary,
`but it can be used to increase input impedance. With-
`outit (i.e. terminals 7 and 8 connected together), the in-
`put
`impedance is 8k); with it,
`this impedance in-
`creases to (R + 8kQ).
`
`For larger FM deviations or for frequency sweeping, the
`modulating signal is applied between the positive sup-
`ply voltage and pin 8 (Figure 4b). In this way the entire
`bias for the current sources is created by the modulat-
`ing signal and a very large (e.g., 1000:1) sweep range is
`obtained (f = 0 at Vsweep = 0). Care must be taken,
`however, to regulate the supply voltage; in this configu-
`ration the charge current is no longer a function of the
`supply voltage (yet the trigger thresholdsstill are) and
`thus the frequency becomes dependent on the supply
`voltage. The potential on Pin 8 may be swept from Vcc
`to 2/3 Voc +2V.
`
`O Vee
`
`
`Csa © -Vor GND
`
`esa
`
`Var GNO
`
`“Mec
`
`Figure 4. Connections for Frequency Modulation (a) and Sweep (b).
`
`
`
`Exhibit 1037 - Page 7 of 7
`
`Exhibit 1037 - Page 7 of 7
`
`