AD652 Monolithic Synchronous Voltage-to-Frequency Converter

The AD652 Synchronous Voltage-to-Frequency Converter (SVFC) is a powerful building block for precision analog-to-digital conversion, offering typical nonlinearity of 0.002% (0.005% maximum) at a 100 kHz output frequency. The inherent monotonicity of the transfer function and wide range of clock frequencies allows the conversion time and resolution to be optimized for specific applications.

The AD652 uses a variation of the popular charge-balancing technique to perform the conversion function. The AD652 uses an external clock to define the full-scale output frequency, rather than relying on the stability of an external capacitor. The result is a more stable, more linear transfer function, with significant application benefits in both single and multichannel systems.

Gain drift is minimized using a precision low drift reference and low TC on-chip thin-film scaling resistors. Furthermore, the initial gain error is reduced to less than 0.5% by the use of laser-wafer-trimming.

The analog and digital sections of the AD652 have been designed to allow operation from a single-ended power source, simplifying its use with isolated power supplies.

The AD652 is available in five performance grades. The 20-pin PLCC packaged JP and KP grades are specified for operation over the 0°C to +70°C commercial temperature range. The 16- pin cerdip-packaged AQ and BQ grades are specified for operation over the -40°C to +85°C industrial temperature range, and the AD652SQ is available for operation over the full -55°C to +125°C extended temperature range.

Features and Benefits
  • Full-Scale Frequency (up to 2 MHz) set by external system clock
  • Extremely low linearity error (0.005% max at 1 MHz FS, 0.02% max at 2 MHz FS)
  • No critical external components required
  • Accurate 5V reference voltage
  • Low drift (25 ppm/°C max)
  • Dual- or single-supply operation
  • Voltage or current input
  • MIL-STD-883 compliant versions available
Analog to Digital Converters
Data Sheets
Documentnote
AD652: Monolithic Synchronous Voltage-to-Frequency Converter Data Sheet (Rev. C)PDF 779 kB
AD652: Military Data Sheet
Application Notes
Documentnote
AN-276: Analog to Digital Conversion by Using V/F ConvertersPDF 646 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
5962-9322201MEA Production16 ld CerDIPOTH 25-55 to 125C39.5135.72N
AD652AQ Production16 ld CerDIPOTH 25-40 to 85C13.6611.98N
AD652AQ/+ Production16 ld CerDIPOTH 25-40 to 85C00N
AD652BQ Production16 ld CerDIPOTH 25-40 to 85C20.518.81N
AD652JP Production20 ld PLCCOTH 490 to 70C00N
AD652JP-REEL7 Production20 ld PLCCREEL 2500 to 70C00N
AD652JPZ Production20 ld PLCCOTH 490 to 70C13.211.24Y
AD652JPZ-REEL Production20 ld PLCCREEL 10000 to 70C011.24Y
AD652JPZ-REEL7 Production20 ld PLCCREEL 2500 to 70C011.24Y
AD652KP Production20 ld PLCCOTH 490 to 70C00N
AD652KPZ Production20 ld PLCCOTH 490 to 70C15.6312.92Y
AD652KPZ-REEL Production20 ld PLCCREEL 10000 to 70C012.92Y
AD652SE/883B Production20 ld LCCOTH 54-55 to 125C38.3834.5N
AD652SQ Production16 ld CerDIPOTH 25-55 to 125C25.6422.22N
AD652: Monolithic Synchronous Voltage-to-Frequency Converter Data Sheet (Rev. C) ad652
AD652: Military Data Sheet ad652
AN-276: Analog to Digital Conversion by Using V/F Converters ad537