ADS1207

The ADS1206 and ADS1207 are a low-cost, high-performance, synchronous voltage-to-frequency converters (VFC). Both devices can operate from a single 3.0V to 3.6V or 4.5V to 5.5V power supply, consuming only 1mA. The output signal is synchronous with the input clock, CLKIN. The clock input is TTL- and CMOScompatible and the onboard clock generator can also accept an external crystal or resonator. The maximum input clock frequency for the ADS1206 is 1MHz and for the ADS1207 is 4MHz. The clock divider on the ADS1207 scales the input frequency to 2MHZ, which permits the core to operate at the higher rate. The high-impedance input is ideal for direct connection to high-impedance transducers or high-voltage resistive dividers. Countingoutput pulses over a 4ms period results in an effective 12-bit resolution for the product using a 1MHz input clock. For the ADS1207 using a 4MHz input clock, the same result occurs over a 2ms period. Both devices are designed for use in medium-resolution measurements. They are available in an 8-lead VSSOP package.