AD654 V/F Converter IC Chip

AD654(Low Cost Monolithic Voltage-to-Frequency Converter)

Introduction

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 MΩ) 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.

Feature

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

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