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Part Number ADVFC32SH
Manufacturer Analog Devices Inc.
Description IC CONV V/F F/V MONO TO100-10
Datasheet ADVFC32SH Datasheet
Package TO-100-10 Metal Can
In Stock 302 piece(s)
Unit Price $ 27.1400 *
Lead Time Can Ship Immediately
Estimated Delivery Time Aug 10 - Aug 15 (Choose Expedited Shipping)
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Part Number # ADVFC32SH (PMIC - V/F and F/V Converters) is manufactured by Analog Devices Inc. and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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ADVFC32SH Specifications

ManufacturerAnalog Devices Inc.
CategoryIntegrated Circuits (ICs) - PMIC - V/F and F/V Converters
Datasheet ADVFC32SHDatasheet
PackageTO-100-10 Metal Can
TypeVolt to Frequency and Frequency to Volt
Frequency - Max500kHz
Full Scale��150ppm/°C
Mounting TypeThrough Hole
Package / CaseTO-100-10 Metal Can
Supplier Device PackageTO-100-10

ADVFC32SH Datasheet

Page 1

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REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADVFC32 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: Fax: 781/326-8703 © Analog Devices, Inc., 2000 Voltage-to-Frequency and Frequency-to-Voltage Converter FEATURES High Linearity 0.01% Max at 10 kHz FS 0.05% Max at 100 kHz FS 0.2% Max at 500 kHz FS Output TTL/CMOS-Compatible V/F or F/V Conversion 6 Decade Dynamic Range Voltage or Current Input Reliable Monolithic Construction MIL-STD-883-Compliant Versions Available PIN CONFIGURATION (TOP VIEW) N-14 Package H-10A Package PRODUCT DESCRIPTION The industry standard ADVFC32 is a low cost monolithic voltage-to-frequency (V/F) converter or frequency-to-voltage (F/V) converter with good linearity (0.01% max error at 10 kHz) and operating frequency up to 0.5 MHz. In the V/F configuration, positive or negative input voltages or currents can be converted to a proportional frequency using only a few external compo- nents. For F/V conversion, the same components are used with a simple biasing network to accommodate a wide range of input logic levels. TTL or CMOS compatibility is achieved in the V/F operating mode using an open collector frequency output. The pull-up resistor can be connected to voltages up to 30 volts, or to 15 V or 5 V for conventional CMOS or TTL logic levels. This resis- tor should be chosen to limit current through the open collector output to 8 mA. A larger resistance can be used if driving a high impedance load. Input offset drift is only 3 ppm of full scale per °C, and full- scale calibration drift is held to a maximum of 100 ppm/°C (ADVFC32BH) due to a low T.C. Zener diode. The ADVFC32 is available in commercial, industrial, and extended temperature grades. The commercial grade is pack- aged in a 14-lead plastic DIP while the two wider temperature range parts are packaged in hermetically sealed 10-lead cans. PRODUCT HIGHLIGHTS 1. The ADVFC32 uses a charge balancing circuit technique (see Functional Block Diagram) which is well suited to high accuracy voltage-to-frequency conversion. The full-scale operating frequency is determined by only one precision resistor and capacitor. The tolerance of other support compo- nents (including the integration capacitor) is not critical. Inexpensive ±20% resistors and capacitors can be used with- out affecting linearity or temperature drift. 2. The ADVFC32 is easily configured to satisfy a wide range of system requirements. Input voltage scaling is set by selecting the input resistor which sets the input current to 0.25 mA at the maximum input voltage. 3. The same components used for V/F conversion can also be used for F/V conversion by adding a simple logic biasing network and reconfiguring the ADVFC32. 4. The ADVFC32 is intended as a pin-for-pin replacement for VFC32 devices from other manufacturers. 5. The ADVFC32 is available in versions compliant with MIL- STD-883. Refer to the Analog Devices Military Products Databook or current ADVFC32/883B data sheet for detailed specifications.

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REV. B–2– ADVFC32–SPECIFICATIONS (typical @ 25C with VS = 15 V unless otherwise noted.) ADVFC32K ADVFC32B ADVFC32S Model Min Typ Max Min Typ Max Min Typ Max Unit DYNAMIC PERFORMANCE Full-Scale Frequency Range 0 500 0 500 0 500 kHz Nonlinearity1 fMAX = 10 kHz –0.01 ± 0.01 –0.01 +0.01 –0.01 +0.01 % fMAX = 100 kHz –0.05 +0.05 –0.05 +0.05 –0.05 +0.05 % fMAX = 0.5 MHz –0.20 ± 0.05 +0.20 –0.20 ± 0.05 +0.20 –0.20 ± 0.05 +0.20 % Full-Scale Calibration Error (Adjustable to Zero) ± 5 ± 5 ± 5 % vs. Supply (Full-Scale Frequency = 100 kHz) –0.015 +0.015 –0.015 +0.015 –0.015 +0.015 % of FSR% vs. Temperature (Full-Scale Frequency = 10 kHz) ± 75 –100 +100 +150 +150 ppm/°C DYNAMIC RESPONSE Maximum Settling Time for Full Scale Step Input 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs Overload Recovery Time 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µs ANALOG INPUT AMPLIFIER (V/F Conversion) Current Input Range 0 0.25 0 0.25 0 0.25 mA Voltage Input Range 0 –10 0 –10 0 –10 V2 0.25 0.25 0.25 mA × RIN3 × RIN3 × RIN3 Differential Impedance 300 kΩ||10 pF 2 MΩ||10 pF 300 kΩ||10 pF 2 MΩ||10 pF 300 kΩ||10 pF 2 MΩ||10 pF Common-Mode Impedance 300 MΩ||3 pF 750 MΩ||3 pF 300 MΩ||3 pF 750 MΩ||10 pF 300 MΩ||3 pF 750 MΩ||10 pF Input Bias Current Noninverting Input 40 250 40 250 40 250 nA Inverting Input –100 ± 8 +100 –100 ± 8 +100 –100 ± 8 +100 nA Input Offset Voltage (Trimmable to Zero)2, 3 4 4 4 mV vs. Temperature (TMIN to TMAX) 30 30 30 µV/°C Safe Input Voltage ± VS ± VS ± VS COMPARATOR (F/V Conversion) Logic “0” Level –VS –0.6 –VS –0.6 –VS –0.6 V Logic “1” Level 1 +VS 1 +VS 1 +VS V Pulse Width Range4 0.1 0.15/fMAX 0.1 0.15/fMAX 0.1 0.15/fMAX µs Input Impedance 50 kΩ||10 pF 250 kΩ 50 kΩ||10 pF 250 kΩ 50 kΩ||10 pF 250 kΩ OPEN COLLECTOR OUTPUT (V/F Conversion) Output Voltage in Logic “0” ISINK = 8 mA 0.4 0.4 0.4 V Output Leakage Current in Logic “1” 1 1 1 µA Voltage Range 0 30 0 30 0 30 V Fall Times (Load = 500 pF and ISINK = 5 mA) 400 400 400 ns AMPLIFIER OUTPUT (F/V Conversion) Voltage Range (0 mA≤IO≤7 mA) 0 10 0 10 0 10 V Source Current (0≤VO≤7 V) 10 10 10 mA Capacitive Load (Without Oscillation) 100 100 100 pF Closed Loop Output Impedance 1 1 1 Ω POWER SUPPLY Rated Voltage ± 15 ± 15 ± 15 V Voltage Range ± 9 ± 18 ± 9 ± 18 ± 9 ± 18 V Quiescent Current 6 8 6 8 6 8 mA TEMPERATURE RANGE Specified Range 0 +70 –25 +85 –55 +125 °C Operating Range –25 +85 –55 +125 –55 +125 °C Storage –25 +85 –65 +150 –65 +150 °C PACKAGE OPTIONS Plastic DIP (N-14) ADVFC32KN TO–100 (H-10A) ADVFC32BH ADVFC32SH NOTES 1Nonlinearity defined as deviation from a straight line from zero to full scale, expressed as a percentage of full scale. 2See Figure 3. 3See Figure 1. 4fMAX expressed in units of MHz. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. Specifications subject to change without notice.

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REV. B –3– ADVFC32 UNIPOLAR V/F, POSITIVE INPUT VOLTAGE When operated as a V/F converter, the transformation from voltage to frequency is based on a comparison of input signal magnitude to the 1 mA internal current source. A more complete understanding of the ADVFC32 requires a close examination of the internal circuitry of this part. Consider the operation of the ADVFC32 when connected as shown in Figure 1. At the start of a cycle, a current proportional to the Figure 1. Connection Diagram for V/F Conversion, Positive Input Voltage input voltage flows through R3 and R1 to charge integration capacitor C2. As charge builds up on C2, the output voltage of the input amplifier decreases. When the amplifier output volt- age (Pin 13) crosses ground (see Figure 2 at time t1), the comparator triggers a one shot whose time period is determined by capacitor C1. Specifically, the one shot time period (in nano- seconds) is: tOS ≅ (Cl + 44 pF) × 6.7 kΩ Figure 2. Voltage-to-Frequency Conversion Waveforms During this period, a current of (1 mA – IIN) flows out of the integration capacitor. The total amount of charge depleted during one cycle is, therefore (1 mA – IIN) × tOS. This charge is replaced during the remainder of the cycle to return the integra- tor to its original voltage. Since the charge taken out of C2 is equal to the charge that is put on C2 every cycle, (1 mA – IIN) × tOS = IIN × 1 FOUT – tOS     or, rearranging terms, FOUT = IIN 1mA × tOS The complete transfer equation can now be derived by substi- tuting IIN = VIN/RIN and the equation relating C1 and tOS. The final equation describing ADVFC32 operation is: VIIN / RIN 1mA × C1 + 44 pF( ) × 6.7kΩ Components should be selected to optimize performance over the desired input voltage and output frequency range using the equations listed below: 3.7 ×107 pF / sec FOUT FS – 44 pF C2 = 10–4 Farads / sec FOUT FS 1000pF minimum( ) RIN = VIN FS 0.25mA R2 ≥ +VLOGIC 8mA Both RIN and C1 should have very low temperature coefficients as changes in their values will result in a proportionate change in the V/F transfer function. Other component values and tem- perature coefficients are not critical. Table I. Suggested Values for C1, RIN and C2 VIN FS FOUT FS C1 RIN C2 1 V 10 kHz 3650 pF 4.0 kΩ 0.01 µF 10 V 10 kHz 3650 pF 40 kΩ 0.01 µF 1 V 100 kHz 330 pF 4.0 kΩ 1000 pF 10 V 100 kHz 330 pF 40 kΩ 1000 pF ORDERING GUIDE Part Gain Tempco Temp Range Package Number1 ppm/C C Option ADVFC32KN ±75 typ 0 to 70 14-Pin Plastic DIP ADVFC32BH ±100 max –25 to +85 TO-100 ADVFC32SH ±150 max –55 to +125 TO-100 NOTE 1For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current ADVFC32/883B data sheet. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADVFC32 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE

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REV. B ADVFC32 –4– Input resistance RIN is composed of a fixed resistor (R1) and a variable resistor (R3) to allow for initial gain error compensation. To cover all possible situations, R3 should be 20% of RIN, and R1 should be 90% of RIN. This allows a ±10% gain adjustment to compensate for the ADVFC32 full-scale error and the toler- ance of C1. If more accurate initial offset is required, the circuit of R4 and R5 can be added. R5 can have a value between 10 kΩ and 100 kΩ, and R4 should be approximately 10 MΩ. The amount of current required to trim zero offset will be relatively small, so the temperature coefficients of these resistors are not critical. If large offsets are added using this circuit, temperature drift of both of these resistors is much more important. BIPOLAR V/F By adding another resistor from Pin 1 (Pin 2 of TO-100 can) to a stable positive voltage, the ADVFC32 can be operated with a bipolar input voltage. For example, an 80 kΩ resistor to 10 V causes an additional current of 0.125 mA to flow into the inte- grator so that the net current flow to the integrator is positive even for negative input voltages. At negative full-scale input voltage, 0.125 mA will flow into the integrator from VIN cancel- ling out the 0.125 mA from the offset resistor, resulting in an output frequency of zero. At positive full scale, the sum of the two currents will be 0.25 mA and the output will be at its maxi- mum frequency. UNIPOLAR V/F, NEGATIVE INPUT VOLTAGE Figure 3 shows the connection diagram for V/F conversion of negative input voltages. In this configuration full-scale output frequency occurs at negative full-scale input, and zero output frequency corresponds to zero input voltage. Figure 3. Connection Diagram for V/F Conversion, Negative Input Voltage A very high impedance signal source may be used since it only drive the noninverting integrator input. Typical input imped- ance at this terminal is 250 MΩ or higher. For V/F conversion of positive input signals the signal generator must be able to source 0.25 mA to properly drive the ADVFC32, but for nega- tive V/F conversion the 0.25 mA integration current is drawn from ground through R1 and R3. Circuit operation for negative input voltages is very similar to positive input unipolar conversion described in the previous section. For best operating results use component equations listed in that section. F/V CONVERSION Although the mathematics of F/V conversion can be very com- plex, the basic principle is easy to understand. Figure 4 shows the connection diagram for F/V conversion with TTL input logic levels. Each time the input signal crosses the comparator threshold going negative, the one shot is activated and switches 1 mA into the integrator input for a measured time period (determined by C1). As the frequency increases, the amount of charge injected into the integration capacitor increases propor- tionately. The voltage across the integration capacitor is stabilized when the leakage current through R1 and R3 equals the average current being switched into the integrator. The net result of these two effects is an average output voltage which is propor- tional to the input frequency. Optimum performance can be obtained by selecting components using the same guidelines and equations listed in the V/F conversion section. Figure 4. Connection Diagram for F/V Conversion, TTL Input DECOUPLING Decoupling power supplies at the device is good practice in any system, but absolutely imperative in high resolution applica- tions. For the ADVFC32, it is important to remember where the voltage transients and ground currents flow. For example, the current drawn through the output pull-down transistor originates from the logic supply, and is directed to ground through Pin 11 (Pin 8 of TO-100). Therefore, the logic supply should be decoupled near the ADVFC32 to provide a low im- pedance return path for switching transients. Also, if there is a separate digital ground it should be connected to the analog ground at the ADVFC32. This will prevent ground offsets that could be created by directing the full 8 mA output current into the analog ground, and subsequently back to the logic supply. Although some circuits may operate satisfactorily with the power supplies decoupled at only one location on each board, this practice is not recommended for the ADVFC32. For best results, each supply should be decoupled with 0.1 µF capacitor at the ADVFC32. In addition, a larger board level decoupling capaci- tor of 1 µF to 10 µF should be located relatively close to the ADVFC32 on each power supply. COMPONENT TEMPERATURE COEFFICIENTS The drift specifications of the ADVFC32 do not include tem- perature effects of any of the supporting resistors or capacitors. The drift of the input resistors R1 and R3 and the timing capaci- tor C1 directly affect the overall temperature stability. In the

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REV. B ADVFC32 –5– application of Figure 2, a 10 ppm/°C input resistor used with a 100 ppm/°C capacitor may result in a maximum overall circuit gain drift of: 100 ppm/°C (ADVFC32BH) + 100 ppm/°C (C1) + 10 ppm/°C (RIN) = 210 ppm/°C Although RIN and C1 have the most pronounced effect on tem- perature stability, the offset circuit of resistors R4 and R5 may also have a slight effect on the offset temperature drift of the circuit. The offset will change with variations in the resistance of R4 and supply voltage changes. In most applications the offset adjustment is very small, and the offset drift attributable to this circuit will be negligible. In the bipolar mode, however, both the positive reference and the resistor used to offset the signal range will have a pronounced effect on offset drift. A high quality refer- ence and resistor should be used to minimize offset drift errors. Other circuit components do not directly influence temperature performance as long as their actual values are not so different from nominal value as to preclude operation. This includes integration capacitor C2. A change in the capacitance value of C2 results in a different rate of voltage change across C2, but this is compensated by an equal effect when C2 is discharged by the switched 1 mA current source so that no net effect occurs. The temperature effects of the components described above are the same when the ADVFC32 is configured for negative or bipolar input ranges, or F/V conversion. OTHER CIRCUIT CONSIDERATIONS The input amplifier connected to Pins 1, 13, and 14 is not a standard operational amplifier. Although it operates like an op amp in most applications, two key differences should be noted. First, the bias current of the positive input is typically 40 nA while the bias current of the inverting input is ±8 nA. Therefore, any attempt to cancel input offset voltage due to bias currents by matching input resistors will create worse offsets. Second, the output of this amplifier will sink only 1 mA, even though it will source as much as 10 mA. When used in the F/V mode, the amplifier must be buffered if large sink currents are required. MICROPROCESSOR OPERATED A/D CONVERTER With the addition of a few external components the ADVFC32 can be used as a ±10 V A/D microprocessor front end. Although the nonlinearity of the ADVFC32 is only 0.05% maximum (0.01% typ), the resolution is much higher, allowing it to be used in 16-bit measurement and control systems where a mono- tonic transfer function is essential. The resolution of the circuit shown in Figure 5 is dependent on the amount of time allowed to count the ADVFC32 frequency output. Using a full-scale frequency of 100 kHz, an 8-bit conversion can be made in about 10 ms, and a 2 second time period allows a 16-bit measurement, including offset and gain calibration cycles. As shown in Figure 5, the input signal is selected via the AD7590 input multiplexer. Positive and negative references as well as a ground input are provided to calibrate the A/D. This is very important in systems subject to moderate or extreme temperature changes since the gain temperature coefficient of the ADVFC32 is as high as ±150 ppm/°C. By using the calibration cycles, the A/D conversion will be as accurate as the references provided. The AD542 following the input multiplexer provides a high impedance input (1012 ohms) and buffers the switch resistance from the relatively low impedance ADVFC32 input. If higher linearity is required, the ADVFC32 can be operated at 10 kHz, but this will require a proportionately longer conversion time. Conversely, the conversion time can be decreased at the expense of nonlinearity by increasing the maximum frequency to as high as 500 kHz. HIGH NOISE IMMUNITY, HIGH CMRR ANALOG DATA LINK In many applications, a signal must be sensed at a remote site and sent through a very noisy environment to a central location for further processing. In these cases, even a shielded cable may not protect the signal from noise pickup. The circuit of Figure 6 provides a solution in these cases. Due to the optocoupler and voltage-to-frequency conversion, this data link is extremely insensitive to noise and common-mode voltage interference. For even more protection, an optical fiber link substituted for the HCPL2630 will provide common-mode rejection of more than several hundred kilovolts and virtually total immunity to electrical noise. For most applications, however, the frequency modulated signal has sufficient noise immunity without using an optical fiber link, and the optocoupler provides common-mode isolation up to 3000 V dc. Figure 5. High Resolution, Self-Calibrating, Microprocessor Operated A/D Converter

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June 30, 2020

Wow super fast delivery, product as described good company!


June 30, 2020

Perfectly functioning!! on time and as described!


June 25, 2020

Used this on starter solenoid and works as expected.


June 24, 2020

Well packaged and good condition with the parts, arrived on time, good customer service.


June 23, 2020

Quality electronic components plus fast response.Thank you.


June 13, 2020

Does what it says. As with this this type of device it is important to have it mounted so that heat can dissipate. The higher the amperage the hotter the device.


June 11, 2020

I always have good experiences in dealing with Heisener Electronics. They have the components I need in stock, their search function is great, and shipping is fast and always as promised.


June 7, 2020

A good, reputable company that I will continue to deal with, thank you!


June 5, 2020

So far so good. I need to see how they hold up.


May 30, 2020

Great seller, would recommend buying from. , good communication and problem solving

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