advfc32 Analog Devices, Inc., advfc32 Datasheet

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advfc32

Manufacturer Part Number
advfc32
Description
Voltage-to-frequency And Frequency-to-voltage Converter
Manufacturer
Analog Devices, Inc.
Datasheet

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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.
Frequency-to-Voltage Converter
2. The ADVFC32 is easily configured to satisfy a wide range of
3. The same components used for V/F conversion can also be
4. The ADVFC32 is intended as a pin-for-pin replacement for
5. The ADVFC32 is available in versions compliant with MIL-
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.
used for F/V conversion by adding a simple logic biasing
network and reconfiguring the ADVFC32.
VFC32 devices from other manufacturers.
STD-883. Refer to the Analog Devices Military Products
Databook or current ADVFC32/883B data sheet for detailed
specifications.
Voltage-to-Frequency and
PIN CONFIGURATION
H-10A Package
N-14 Package
(TOP VIEW)
ADVFC32

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advfc32 Summary of contents

Page 1

... PIN CONFIGURATION (TOP VIEW) N-14 Package H-10A Package 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. 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 ...

Page 2

... ADVFC32KN ADVFC32BH 15 V unless otherwise noted.) ADVFC32S Max Min Typ Max 500 0 500 +0.01 –0.01 +0.01 +0.05 –0.05 +0.05 ± 0.05 +0.20 –0.20 +0.20 ± 5 +0.015 –0.015 +0.015 +100 +150 +150 1 Pulse of New Frequency Plus 1 µs 1 Pulse of New Frequency Plus 1 µ ...

Page 3

... 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 ...

Page 4

... 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. 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. ...

Page 5

... 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 ...

Page 6

... ADVFC32 The data link input voltage is changed in a frequency modulated signal by the first ADVFC32. A 42.2 kΩ input resistor and a 100 kΩ offset resistor set the scaling so that input signal corresponds to 50 kHz, and input results in the maximum output frequency of 500 kHz. A high frequency optocoupler is then used to transmit the signal across any common-mode volt- age potentials to the receiving ADVFC32 ...

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