AD654
NOT RECOMMENDED FOR NEW DESIGNSLow Cost Monolithic Voltage-to-Frequency Converter
- Part Models
- 4
- 1ku List Price
- Starting From $7.15
Overview
- 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
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.
Documentation
Data Sheet 1
Application Note 4
Frequently Asked Question 1
Video 1
Rarely Asked Question Page 8
Student Zone Article page 1
Analog Dialogue 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD654JNZ | 8-Lead PDIP | ||
| AD654JRZ | 8-Lead SOIC | ||
| AD654JRZ-REEL | 8-Lead SOIC | ||
| AD654JRZ-REEL7 | 8-Lead SOIC |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jul 16, 2025 - 25_0091 Qualification of Wafer Fabrication Site Analog Devices, Inc. Camas WA for (Bipolar) Products |
||
| AD654JNZ | ||
| AD654JRZ | ||
| AD654JRZ-REEL | ||
| AD654JRZ-REEL7 | ||
|
Nov 9, 2011 - 11_0182 Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines |
||
| AD654JNZ | ||
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD654JNZ | ||
|
Nov 23, 2010 - 10_0004 Halogen Free Material Change for SOIC Narrow Body Products Assembled at Amkor |
||
| AD654JRZ | ||
| AD654JRZ-REEL | ||
| AD654JRZ-REEL7 | ||
This is the most up-to-date revision of the Data Sheet.