GENERAL DESCRIPTION

The AD7741/AD7742 are a new generation of synchronous voltage-to-frequency converters (VFCs). The AD7741 is a single-channel version in an 8-lead package (SOIC/DIP) and the AD7742 is a multichannel version in a 16-lead package (SOIC/DIP). No user trimming is required to achieve the specified performance.

The AD7741 has a single buffered input whereas the AD7742 has four buffered inputs that may be configured as two fully differential inputs or three pseudo-differential inputs. Both parts include an on-chip +2.5 V bandgap reference that provides the user with the option of using this internal reference or an external reference.

FEATURES

  AD7741: One Single-Ended Input Channel

  AD7742: Two Differential or Three Pseudo-Differential Input Channels

  Integral Nonlinearity of 0.012% at fOUT(Max) = 2.75 MHz (AD7742) and at fOUT(Max) = 1.35 MHz (AD7741)

  Single +5 V Supply Operation

  Buffered Inputs

  Programmable Gain Analog Front-End

  On-Chip +2.5 V Reference

  Internal/External Reference Option

  Power Down to 35 mA Max

  Minimal External Components Required

  8-Lead and 16-Lead DIP and SOIC Packages

APPLICATIONS

  Low Cost Analog-to-Digital Conversion

  Signal Isolation