The AD537 is a monolithic V-F converter consisting of an inputamplifier, a precision oscillator system, an accurate internal referencegenerator and a high current output stage. Only a singleexternal 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., andoperation is guaranteed over an 80 dB dynamic range. The overalltemperature coefficient (excluding the effects of externalcomponents) is typically ±30 ppm/°C. The AD537 operatesfrom a single supply of 5 V to 36 V and consumes only 1.2 mAquiescent current.A temperature-proportional output, scaled to 1.00 mV/K,enables the circuit to be used as a reliable temperature-tofrequencyconverter; in combination with the fixed referenceoutput of 1.00 V, offset scales such as 0°C or 0°F can be generated.The low drift (1 μV/°C typ) input amplifier allows operationdirectly from small signals (e.g., thermocouples or strain gages)while offering a high (250MΩ) input resistance. Unlike mostV–F converters, the AD537 provides a square-wave output, andcan drive up to 12 TTL loads, LEDs, very long cables, etc.The excellent temperature characteristics and long-term stabilityof the AD537 are guaranteed by the primary bandgap referencegenerator and the low T.C. silicon chromium thin film resistorsused throughout.The device is available in either a 14-lead ceramic DIP or a 10-leadmetal can; both are hermetically sealed packages.The AD537 is available in three performance/temperaturegrades; the J and K grades are specified for operation over the0°C to +70°C range while the AD537S is specified for operationover the extended temperature range, –55°C to +125°C.
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