The ADS7887 is a 10-bit, 1.25-MSPS analog-to-digital converter (ADC), and the ADS7888 is a 8-bit, 1.25-MSPS ADC. The devices include a capacitor based SAR A/D converter with inherent sample and hold. The serial interface in each device iscontrolled by theCS\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 devicesoperate from awide 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 includea power saving powerdown 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 SOT23 and SC70 packages and are specified for operation from -40°C to 125°C.
1.25-MHz Sample Rate Serial Device
10-Bit Resolution - ADS7887
8-Bit Resolution - ADS7888
25-MHz Serial Interface
Supply Range: 2.35 V to 5.25 V
Typical Power Dissipation at 1.25 MSPS:
3.8 mW at 3-V VDD
8 mw at 5-V VDD
±0.35 LSB INL, DNL - ADS7887
±0.15 LSB INL, ±0.1 LSB DNL - ADS7888
61dB SINAD, -84 dB THD - ADSA7887
49.5 dB SINAD, -67.5 dB THD - ADS7888
Unipolar Input Range: 0 V to VDD
Power Down Current: 1 µA
Wide Input Bandwidth: 15 MHz at 3 dB
6-Pin SOT23 and SC70 Packages
Base Band Converters in Radio Communication
Motor Current/Bus Voltage Sensors in Digital Drives