AD7742:  New Low-Cost, Single-Supply, MultiChannel Synchronous VFC

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 ...More

AD7742:  New Low-Cost, Single-Supply, MultiChannel Synchronous VFC

Product 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.

An evaluation board for both the AD7741 and the AD7742 is available. The model number is EVAL-AD7741/42EB, and details can be viewed by selecting the "Evaluation Tools" button to the left.

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 µA Max
  • Minimal External Components Required
  • 8-Lead and 16-Lead DIP and SOIC Packages

Diagrams

AD7742 Diagram
Functional Block Diagram for AD7742

Specifications

Architecture Synchronous
# Channels 2-Differential,3-Pseudo Differential
Input Voltage Range (V) +3.5V
Full Scale Fout (kHz) 3072kHz
Reference Voltage (V) 2.5V
Accuracy (%/kHz) 2
Input Clk Frequency (MHz) 6.144MHz
Voltage Supply (V) 4.75 to 5.25
Supply Current (max) 8mA
Package 16-Lead PDIP,16-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 $9.54
AD650 Non-Synchronous 1-Single Ended +11 1000 - 0.1 - +/- 9 to +/- 18 8 14-Lead CerDIP, 14-Lead PDIP, 20-Lead PLCC $7.92
AD652 Synchronous 1-Single Ended ±10 2500 5 2 5 +/- 6 to +/- 15 15 20-Lead PLCC $9.80
AD654 Non-Synchronous 1-Single Ended ±14 500 - 0.4 - +/- 5 to +/- 18 2.5 8-Lead PDIP, 8-Lead SOIC $3.72
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 $0.90
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 $1.74
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 $6.07

* 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.