ADI AD537KD

The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference generator and a high current output stage. Only a single external RC network is required to set up any full-scale (F.S.) frequency up to 100 kHz and any F.S. input voltage up to ±30 V. Linearity error is as low as ±0.05% for 10 kHz F.S., and operation is guaranteed over an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±30 ppm/℃. The AD537 operates from a single supply of 5 V to 36 V and consumes only 1.2 mA quiescent current. A temperature-proportional output, scaled to 1.00 mV/K, enables the circuit to be used as a reliable temperature-to-frequency converter; in combination with the fixed reference output of 1.00 V, offset scales such as 0℃ or 0°F can be generated. The low drift (1 μV/℃ typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 MΩ) input resistance. Unlike most V-F converters, the AD537 provides a square-wave output, and can drive up to 12 TTL loads, LEDs, very long cables, etc. The excellent temperature characteristics and long-term stability of the AD537 are guaranteed by the primary bandgap reference generator and the low T.C. silicon chromium thin film resistors used throughout. The device is available in either a 14-lead ceramic DIP or a 10-lead metal can; both are hermetically sealed packages.

• Low Cost A-D Conversion
• Versatile Input Amplifier Positive or Negative Voltage Modes Negative Current Mode High Input Impedance, Low Drift
• Single Supply, 5 V to 36 V
• Linearity: ±0.05% FS
• Low Power: 1.2 mA Quiescent Current
• Full-Scale Frequency up to 100 kHz
• 1.00 V Reference
• Thermometer Output (1 mV/K)
• F-V Applications
• MIL-STD-883 Compliant Versions Available