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AD7740:  3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter

Product Details


The AD7740 is the world's smallest, lowest-cost, 12-Bit accurate VFC.

Since this is a synchronous converter, the output frequency is related to the fixed master clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz input clock frequency, the FS output frequency is 900 kHz. The voltage reference input can be tied to the supply, if required.

Historically the primary applications for VFCs have been either to implement low cost A/D conversion or to achieve simple isolation.

The AD7740 is being offered in an 8-pin MicroSOIC package plus an 8-lead SOT-23 package. The SOT-packaged devices are only available on T&R. Two operating temperature ranges are available; from 0°C to +85°C and from -40°C to +105°C.

FEATURES and BENEFITS

  • Synchronous Operation
  • Full-Scale Frequency Set by External System Clock
  • 8-Lead SOT-23 and 8-Lead microSOIC Package
  • 3 V and 5 V Operation
  • Low Power: 3 mW (Typ)
  • Nominal Input Range: 0 to VREF
  • True - 150 mV Capability Without Charge Pump
  • VREF Range: 2.5 V to VDD
  • Internal 2.5 V Reference
  • 1 MHz Max Input Frequency
  • Selectable High Impedance Buffered Input
  • Minimal External Components Required

Functional Block Diagram for AD7740

Documentation

Title Content Type File Type
AD7740: 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter Data Sheet (Rev A, 02/2001) (pdf, 144 kB) Data Sheets PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
AN-349: Keys to Longer Life for CMOS  (pdf, 89 kB)
Here's How CMOS Can be Protected Against Abuse
Application Notes PDF
AN-276: Analog to Digital Conversion by Using V/F Converters  (pdf, 646 kB) Application Notes 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

AD7740 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7740KRM Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.24 $1.05 N  Material Info PCN Purchase
AD7740KRM-REEL7 Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 1000 - $1.05 N  Material Info PCN/PDN Purchase
AD7740KRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.07 $0.91 Y  Material Info PCN Purchase Sample
AD7740KRMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $0.91 Y  Material Info PCN Purchase
AD7740KRMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $0.91 Y  Material Info PCN Purchase
AD7740YRM Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.52 $1.29 N  Material Info PCN Purchase
AD7740YRM-REEL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - - N  Material Info PCN/PDN Contact ADI
AD7740YRM-REEL7 Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 1000 - $1.29 N  Material Info PCN/PDN Purchase
AD7740YRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $1.32 $1.12 Y  Material Info PCN Purchase Sample
AD7740YRMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $1.12 Y  Material Info PCN Purchase
AD7740YRMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $1.12 Y  Material Info PCN Purchase
AD7740YRTZ-REEL7 Status: Production 8 ld SOT-23 8 Ind Reel, 3000 - $1.12 Y  Material Info PCN Purchase Sample
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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