Integrated Circuit Voltage-to-Frequency Converter
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-proportional output, scaled to 1.00 mV/K, enables the
circuit to be used as a reliable temperature-tofrequency converter;
in combination with the fixed reference output 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 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
The device is available in either a 14-lead ceramic DIP or a
10-lead metal can; both are hermetically sealed packages.
The AD537 is available in three performance/temperature grades; the
J and K grades are specified for operation over the 0°C to +70°C
range while the AD537S is specified for operation over the extended
temperature range, –55°C to +125°C.
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)
MIL-STD-883 Compliant Versions Available
Integrated Circuits (ICs)
PMIC - V/F and F/V Converters
Voltage to Frequency
Frequency - Max
Package / Case
14-CDIP (0.300", 7.62mm)
Supplier Device Package
740 (CN081 PDF)
Warranty :180days for all goods
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