The AD650 V/F/V (voltage-to-frequency or frequency-to-voltage converter) provides a combination of high frequency operation and low nonlinearity previously unavailable in monolithic form. The inherent monotonicity of the V/F transfer function makes the AD650 useful as a high-resolution analog-to-digital converter. A flexible input configuration allows a wide variety of input voltage and current formats to be used, and an open-collector output with separate digital ground allows simple interfacing to either standard logic families or opto-couplers.
The linearity error of the AD650 is typically 20 ppm (0.002% of full scale) and 50 ppm (0.005%) maximum at 10 kHz full scale. This corresponds to approximately 14-bit linearity in an analog-to-digital converter circuit. Higher full-scale frequencies or longer count intervals can be used for higher resolution conversions. The AD650 has a useful dynamic range of six decades allowing extremely high resolution measurements. Even at 1 MHz full scale, linearity is guaranteed less than 1000 ppm (0.1%) on the AD650KN, KP, BD and SD grades.
In addition to analog-to-digital conversion, the AD650 can be used in isolated analog signal transmission applications, phased locked-loop circuits, and precision stepper motor speed controllers. In the F/V mode, the AD650 can be used in precision tachometer and FM demodulator circuits.
The input signal range and full-scale output frequency are user-programmable with two external capacitors and one resistor. Input offset voltage can be trimmed to zero with an external potentiometer.
The AD650JN and AD650KN are offered in a plastic 14-pin DIP package. The AD650JP and AD650KP are available in a 20-pin plastic leaded chip carrier (PLCC). Both plastic packaged versions of the AD650 are specified for the commercial (0°C to +70°C) temperature range. For industrial temperature range (-25°C to +85°C) applications, the AD650AD and AD650BD are offered in a ceramic package. The AD650SD is specified for the full -55°C to +125°C extended temperature range.
Features and Benefits
| Analog to Digital Converters |
| Document | note |
| AD650: Voltage-to-Frequency and Frequency-to-Voltage Converter Data Sheet (Rev. E) | PDF 434 kB |
| Document | note |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD650ACHIPS Production | CHIPS OR DIE | REEL 100 | 25C | 8.42 | 8.42 | Y |
| AD650AD Production | 14 ld Side-Brazed CerDIP | OTH 25 | -25 to 85C | 22.28 | 19.1 | N |
| AD650BD Production | 14 ld Side-Brazed CerDIP | OTH 25 | -25 to 85C | 0 | 0 | N |
| AD650JN Last Time Buy | 14 ld PDIP | OTH 25 | 0 to 70C | 0 | 0 | N |
| AD650JNZ Production | 14 ld PDIP | OTH 25 | 0 to 70C | 12.67 | 12.67 | Y |
| AD650JP Last Time Buy | 20 ld PLCC | OTH 49 | 0 to 70C | 0 | 0 | N |
| AD650JPZ Production | 20 ld PLCC | OTH 49 | 0 to 70C | 13.59 | 13.59 | Y |
| AD650KNZ Production | 14 ld PDIP | OTH 25 | 0 to 70C | 15.84 | 14.26 | Y |
| AD650SD Production | 14 ld Side-Brazed CerDIP | OTH 25 | -55 to 125C | 42 | 38.49 | N |
| AD650SD/883B Production | 14 ld Side-Brazed CerDIP | OTH 25 | -55 to 125C | 68.49 | 57.68 | N |
