Voltage-to-Frequency and a Frequency-to-Voltage Converter ADVFC32 PIN CONFIGURATION FEATURES (TOP VIEW) High Linearity 0.01% Max at 10 kHz FS N-14 Package 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 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 4. The ADVFC32 is intended as a pin-for-pin replacement for accuracy voltage-to-frequency conversion. The full-scale VFC32 devices from other manufacturers. operating frequency is determined by only one precision 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: (typical 25 C with V = 15 V unless otherwise noted.) ADVFC32SPECIFICATIONS S 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 1 Nonlinearity f = 10 kHz 0.01 0.01 0.01 +0.01 0.01 +0.01 % MAX f = 100 kHz 0.05 +0.05 0.05 +0.05 0.05 +0.05 % MAX f = 0.5 MHz 0.20 0.05 +0.20 0.20 0.05 +0.20 0.20 0.05 +0.20 % MAX 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 s 1 Pulse of New Frequency Plus 1 s 1 Pulse of New Frequency Plus 1 s Overload Recovery Time 1 Pulse of New Frequency Plus 1 s 1 Pulse of New Frequency Plus 1 s 1 Pulse of New Frequency Plus 1 s ANALOG INPUT AMPLIFIER (V/F Conversion) Current Input Range 0 0.25 0 0.25 0 0.25 mA 2 Voltage Input Range 0 10 0 10 0 10 V 0.25 0.25 0.25 mA 3 3 3 R R R IN IN IN Differential Impedance 300 k 10 pF 2 M 10 pF 300 k 10 pF 2 M 10 pF 300 k 10 pF 2 M 10 pF Common-Mode Impedance 300 M 3 pF 750 M 3 pF 300 M 3 pF 750 M 10 pF 300 M 3 pF 750 M 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 2, 3 (Trimmable to Zero) 44 4 mV vs. Temperature (T to T)30 30 30 V/C MIN MAX Safe Input Voltage V V V S S S COMPARATOR (F/V Conversion) Logic 0 Level V 0.6 V 0.6 V 0.6 V S S S Logic 1 Level 1 +V1+V1+V V S S S 4 Pulse Width Range 0.1 0.15/f 0.1 0.15/f 0.1 0.15/f s MAX MAX MAX Input Impedance 50 k 10 pF 250 k 50 k 10 pF 250 k 50 k 10 pF 250 k OPEN COLLECTOR OUTPUT (V/F Conversion) Output Voltage in Logic 0 I = 8 mA 0.4 0.4 0.4 V SINK Output Leakage Current in Logic 1 11 1 A Voltage Range 0 30 0 30 0 30 V Fall Times (Load = 500 pF and I = 5 mA) 400 400 400 ns SINK AMPLIFIER OUTPUT (F/V Conversion) Voltage Range (0 mAI 7 mA) 0 10 0 10 0 10 V O Source Current (0V 7 V) 10 10 10 mA O Capacitive Load (Without Oscillation) 100 100 100 pF Closed Loop Output Impedance 1 1 1 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 TO100 (H-10A) ADVFC32BH ADVFC32SH NOTES 1 Nonlinearity defined as deviation from a straight line from zero to full scale, expressed as a percentage of full scale. 2 See Figure 3. 3 See Figure 1. 4 f expressed in units of MHz. MAX 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. 2 REV. B