The ADS7887 device is a 10-bit, 1.25-MSPS, analog-to-digital converter (ADC), and the
ADS7888 device is a 8-bit, 1.25-MSPS ADC. These devices include a capacitor-based SAR A/D converter
with inherent sample and hold. The serial interface in each device is controlled by the
CS and SCLK signals for glueless connections with microprocessors and DSPs.
The input signal is sampled with the falling edge of CS, and SCLK is used
for conversion and serial data output.
The devices operate from a wide supply range from 2.35 V to 5.25 V. The low power
consumption of the devices make them suitable for battery-powered applications. The devices also
include a power-saving, power-down feature for when the devices are operated at lower conversion
speeds.
The high level of the digital input to the device is not limited to device
VDD. This means the digital input can go as high as 5.25 V when device
supply is 2.35 V. This feature is useful when digital signals are coming from other circuit with
different supply levels. Also this relaxes restriction on power-up sequencing.
The ADS7887 and ADS7888 are available in 6-pin SOT-23 and SC70 packages and are specified
for operation from –40°C to 125°C.
