AD654:  Low Cost Monolithic Voltage-to-Frequency Converter

The AD654 is a monolithic V/F converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. A single RC network is all that is required to set up any ...More

AD654:  Low Cost Monolithic Voltage-to-Frequency Converter

Product Description

The AD654 is a monolithic V/F converter consisting of an input amplifier, a precision oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 kHz and any FS input voltage up to ±30 V. Linearity error is only 0.03% for a 250 kHz FS, and operation is guaranteed over an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±50 ppm/°C. The AD654 operates from a single supply of 5 V to 36 V and consumes only 2.0 mA quiescent current.

The low drift (4 µV/°C typ) input amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 M(ohm)) input resistance. Unlike most V/F converters, the AD654 provides a square-wave output, and can drive up to 12 TTL loads, optocouplers, long cables, or similar loads.

Features

  • Low Cost
  • Single or Dual Supply,
    5 V to 36 V, ±5 V to ±18 V
  • Full-Scale Frequency Up to 500 kHz
  • Minimum Number of External Components Needed
  • Versatile Input Amplifier
    - Positive or Negative Voltage Modes
    - Negative Current Mode
    - High Input Impedance, Low Drift
  • Low Power: 2.0 mA Quiescent Current
  • Low Offset: 1 mV

Diagrams

AD654 Diagram
Functional Block Diagram for AD654

技术指标

Architecture Non-Synchronous
# Channels 1-Single Ended
Input Voltage Range (V) ±14V
Full Scale Fout (kHz) 500kHz
Accuracy (%/kHz) 0.4
Voltage Supply (V) +/- 5 to +/- 18
Supply Current (max) 2.5mA
Package 8-Lead PDIP,8-Lead SOIC

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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 $9.65
AD650 Non-Synchronous 1-Single Ended +11 1000 - 0.1 - +/- 9 to +/- 18 8 14-Lead CerDIP, 14-Lead PDIP, 20-Lead PLCC $8.02
AD652 Synchronous 1-Single Ended ±10 2500 5 2 5 +/- 6 to +/- 15 15 20-Lead PLCC $9.92
AD654 Non-Synchronous 1-Single Ended ±14 500 - 0.4 - +/- 5 to +/- 18 2.5 8-Lead PDIP, 8-Lead SOIC $3.76
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 $0.91
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 $1.76
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 $6.14

* 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.

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*这里所列出的美国报价单仅供预算参考，指美元报价（规定订量的每片美元，美国离岸价），如有修改不再另行通知。由于地区关税、商业税、汇率及手续费原因，国际报价可能不同。对于特殊批量报价，请与您当地的ADI公司办事处或代理商联络。对于评估板和套件的报价是指一个单位价格。
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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