AD537

a FEATURES 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 Integrated Circuit Voltage-to-Frequency Converter AD537* PIN CONFIGURATIONS D-14 Package H-10A Package LOGIC GND 10 AD537 LOGIC GND SYNC IIN –VIN +VIN VTEMP VREF 1 2 3 4 5 6 7 VT VR PRECISION VOLTAGE REFERENCE CURRBUF TO-FREQ CONV DRIVER 14 13 12 11 10 9 8 OUTPUT +VS CAP CAP VOS VOS –VS –VIN 1 9 OUTPUT AD537 DRIVER 8 +VS CURRTO-FREQ CONV 7 CAP +VIN 2 BUF 3 VTEMP 4 VREF VT PRECISION VOLTAGE VR REFERENCE 6 5 CAP –VS (CONNECTED TO CASE) PRODUCT DESCRIPTION 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/°C. The AD537 operates from a single supply of 5 V to 36 V and consumes only 1.2 mA quiescent current. A temperature-pr...