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AD537:  Integrated Circuit Voltage-to-Frequency Converter

Product Details


The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference generator and a high current output stage. Only a single external RC network is required to set up any full-scale (F.S.) frequency up to 100 kHz and any F.S. input voltage up to ±30 V. Linearity error is as low as ±0.05% for 10 kHz F.S., and operation is guaranteed over an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±30 ppm/°C. The AD537 operates from a single supply of 5 V to 36 V and consumes only 1.2 mA quiescent current.

A temperature-proportional output, scaled to 1.00 mV/K, enables the circuit to be used as a reliable temperature-to-frequency converter; in combination with the fixed reference output of 1.00 V, offset scales such as 0°C or 0°F can be generated.

The low drift (1µV/°C typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 M(Ohm) input resistance. Unlike most V-F converters, the AD537 provides a square-wave output, and can drive up to 12 TTL loads, LEDs, very long cables, etc.

The excellent temperature characteristics and long-term stability of the AD537 are guaranteed by the primary bandgap reference generator and the low T.C. silicon chromium thin film resistors used throughout.

The device is available in either a TO-116 ceramic DIP or a TO-100 metal can; both are hermetically sealed packages.

The AD537 is available in three performance/temperature grades; the J and K grades are specified for operation over the 0°C to +70°C range while the AD537S is specified for operation over the extended temperature range, -55°C to +125°C.

FEATURES and BENEFITS

  • Low Cost A-D Conversion
  • Versatile Input Amplifier
    - Positive or Negative Voltage Modes
    - Negative Current Mode
    - High Input Impedance, Low Drift
  • Single Supply, 5 V to 36 V
  • Linearity: ±0.05% FS
  • Low Power: 1.2 mA Quiescent Current
  • Full-Scale Frequency up to 100 kHz
  • 1.00 V Reference
  • Thermometer Output (1 mV/K)
  • F-V Applications
  • MIL-STD-883 Compliant Versions Available

Pin Configuration for AD537

Documentation

Title Content Type File Type
AD537: Integrated Circuit Voltage-to-Frequency Converter Data Sheet (Rev C, 04/2000) (pdf, 179 kB) Data Sheets PDF
AN-280: Mixed Signal Circuit Technologies  (pdf, 2101 kB)
Considers problems which arise when reality (& Murphy) intervene in a design which otherwise seems satisfactory in terms of theory and modeling.
Application Notes PDF
AN-361: Ask the Applications Engineer (V/F Converters)  (pdf, 287 kB) Application Notes PDF
AN-343: Circuit Ideas for IC Converters  (pdf, 391 kB) Application Notes PDF
AN-276: Analog to Digital Conversion by Using V/F Converters  (pdf, 646 kB) Application Notes PDF
AN-277: Applications for the AD537 Voltage to Frequency Converter  (pdf, 2290 kB) Application Notes PDF
Ask The Applications Engineer-3
(V/F Converters)

(Analog Dialogue, 30th Anniversary Reader Bonus)
Analog Dialogue HTML
PCN#00-406  (pdf, 14 kB)
(4/14/00)
Product Change notice for change of Analog Devices, Inc. Aerospace Product Line standard product from 883 Class S to MIL-PRF-38535, level V.
Aerospace Information PDF
Aerospace Dice  (pdf, 196 kB)
(Revised 1/2006)
Many Analog Devices products can be purchased as Class K die.
Aerospace Information PDF
Standard Space Level Products Program  (pdf, 39 kB)
This brochure describes the standard flow and how to order Analog Devices, Inc. standard product for Space Level not available as JAN, or QML. It replaces the Standard Class S brochure.
Aerospace Information PDF
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
What is a Voltage to Frequency Converter (VFC) and how can the be used to send analog signals over long distances without loss of accuracy? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD537 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD537JCHIPS Status: Production CHIPS OR DIE 0 Comm. Tray, 140 $14.70 $14.70 Y  Material Info PCN Purchase
AD537JD Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $44.87 $40.56 N  Material Info PCN Purchase
AD537JH Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $11.66 $10.54 N  Material Info PCN Purchase
AD537KD Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $70.45 $63.67 N  Material Info PCN Purchase
AD537KH Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $19.75 $17.85 N  Material Info PCN Purchase
AD537SD Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $102.78 $92.92 N  Material Info PCN Purchase
AD537SD/883B Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $178.11 $161.00 N  Material Info PCN Purchase
AD537SH Status: Production ROUND HEADER/METAL CAN 10 Mil Tube, 100 $38.81 $35.08 N  Material Info PCN Purchase
AD537SH/883B Status: Production ROUND HEADER/METAL CAN 10 Mil Tube, 100 $81.24 $73.44 N  Material Info PCN Purchase
Price Table Help

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.


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