AD7740KRMZ

AD7740 is a low-cost, ultra small synchronous voltage-to-frequency converter (VFC). The full-scale output frequency is synchronous with the clock signal on the CLKIN pin. This clock can be generated with the addition of an external crystal (or resonator) or supplied from a CMOS-compatible clock source. The part has a maximum input frequency of 1MHz. For an analogue input signal that goes from 0V to VREF, the output frequency goes from 10% to 90% of fCLKIN. In buffered mode, the part provides a very high input impedance and accepts a range of 0.1V to VDD – 0.2V on the VIN pin. There is also an unbuffered mode of operation that allows VIN to go from -0.15V to VDD + 0.15V. The modes are interchangeable using the BUF pin. It is widely used in application such as isolation of high common-mode voltages, low-cost analogue-to-digital conversion, battery monitoring, automotive sensing etc. • 3V or 5V operation• Low power is 3mW typ• True -150mV capability without charge pump• VREF range is 2.5V to VDD• Internal 2.5V reference• 1MHz max input frequency• Selectable high impedance buffered input• Input current is 8µA typ at (unbuffered mode, VIN = 5.4V, REFIN = 5.25V)• Operating temperature range is 0°C to +85°C• Packaging style is 8-lead MSOP