Datasheet ADVFC32 (Analog Devices)

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Voltage-to-Frequency and Frequency-to-Voltage Converter ADVFC32 FEATURES PIN CONFIGURATION High Linearity (TOP VIEW)
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0.01% Max at 10 kHz FS
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0.05% Max at 100 kHz FS N-14 Package
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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 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-
H-10A Package
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 2. The ADVFC32 is easily configured to satisfy a wide range of extended temperature grades. The commercial grade is pack- system requirements. Input voltage scaling is set by selecting aged in a 14-lead plastic DIP while the two wider temperature the input resistor which sets the input current to 0.25 mA at range parts are packaged in hermetically sealed 10-lead cans. the maximum input voltage. 3. The same components used for V/F conversion can also be
PRODUCT HIGHLIGHTS
used for F/V conversion by adding a simple logic biasing 1. The ADVFC32 uses a charge balancing circuit technique network and reconfiguring the ADVFC32. (see Functional Block Diagram) which is well suited to high accuracy voltage-to-frequency conversion. The full-scale 4. The ADVFC32 is intended as a pin-for-pin replacement for operating frequency is determined by only one precision VFC32 devices from other manufacturers. resistor and capacitor. The tolerance of other support compo- 5. The ADVFC32 is available in versions compliant with MIL- nents (including the integration capacitor) is not critical. STD-883. Refer to the Analog Devices Military Products Inexpensive ± 20% resistors and capacitors can be used with- Databook or current ADVFC32/883B data sheet for detailed out affecting linearity or temperature drift. specifications. 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
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