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.
|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|
AN-214: Ground Rules for High Speed Circuits
(pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
AN-349: Keys to Longer Life for CMOS
(pdf, 89 kB)
Here's How CMOS Can be Protected Against Abuse
|AN-276: Analog to Digital Conversion by Using V/F Converters (pdf, 646 kB)||Application Notes|
|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|
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.
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