AD654:  Low Cost Monolithic Voltage-to-Frequency Converter

The AD654 is a monolithic V/F converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. A single RC network is all that is required to set up any ...More

AD654:  Low Cost Monolithic Voltage-to-Frequency Converter

Product Description

The AD654 is a monolithic V/F converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 kHz and any FS input voltage up to ±30 V. Linearity error is only 0.03% for a 250 kHz FS, and operation is guaranteed over an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±50 ppm/°C. The AD654 operates from a single supply of 5 V to 36 V and consumes only 2.0 mA quiescent current.

The low drift (4 µV/°C typ) input amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 M(ohm)) input resistance. Unlike most V/F converters, the AD654 provides a square-wave output, and can drive up to 12 TTL loads, optocouplers, long cables, or similar loads.

Features

  • Low Cost
  • Single or Dual Supply,
    5 V to 36 V, ±5 V to ±18 V
  • Full-Scale Frequency Up to 500 kHz
  • Minimum Number of External Components Needed
  • Versatile Input Amplifier
    - Positive or Negative Voltage Modes
    - Negative Current Mode
    - High Input Impedance, Low Drift
  • Low Power: 2.0 mA Quiescent Current
  • Low Offset: 1 mV

Diagrams

AD654 Diagram
Functional Block Diagram for AD654

Specifications

Architecture Non-Synchronous
# Channels 1-Single Ended
Input Voltage Range (V) ±14V
Full Scale Fout (kHz) 500kHz
Accuracy (%/kHz) 0.4
Voltage Supply (V) +/- 5 to +/- 18
Supply Current (max) 2.5mA
Package 8-Lead PDIP,8-Lead SOIC

Explore Other Products

Part# Architecture # Channels Input Voltage Range (V) Full Scale Fout (kHz) Reference Voltage (V) Accuracy (%/kHz) Input Clk Frequency (MHz) Voltage Supply (V) Supply Current (max) Package Price* (1000-4999)
AD537 Non-Synchronous 1-Single Ended ±11 150 1 0.25 - +/- 5 to +/- 18 2.5 14-Lead CerDIP $9.65
AD650 Non-Synchronous 1-Single Ended +11 1000 - 0.1 - +/- 9 to +/- 18 8 14-Lead CerDIP, 14-Lead PDIP, 20-Lead PLCC $8.02
AD652 Synchronous 1-Single Ended ±10 2500 5 2 5 +/- 6 to +/- 15 15 20-Lead PLCC $9.92
AD654 Non-Synchronous 1-Single Ended ±14 500 - 0.4 - +/- 5 to +/- 18 2.5 8-Lead PDIP, 8-Lead SOIC $3.76
AD7740 Synchronous 1-Single Ended +2.5 500 2.5 1 1 3 to 5.25 1.5 8-Lead MSOP, 8-Lead SOT-23 $0.91
AD7741 Synchronous 1-Single Ended +2.5 3072 2.5 2 6.144 4.75 to 5.25 8 8-Lead PDIP, 8-Lead SOIC $1.76
AD7742 Synchronous 2-Differential, 3-Pseudo Differential +3.5 3072 2.5 2 6.144 4.75 to 5.25 8 16-Lead PDIP, 16-Lead SOIC -
ADVFC32 Non-Synchronous 1-Single Ended +10 500 - 0.2 - +/- 9 to +/- 18 8 14-Lead PDIP $6.14

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

Pricing, Packaging & Availability

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  • Pre-Release: The model has not been released to general production, but samples may be available.
  • Production: The model is currently being produced, and generally available for purchase and sampling.
  • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
  • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Production Availability
This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

RoHS Compliant
Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples iinto your cart to check sample availability.

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