1 Features
1• 1.25-MHz Sample Rate Serial Device
• 10-Bit Resolution (ADS7887)
• 8-Bit Resolution (ADS7888)
• Zero Latency
• 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)
• 61 dB SINAD, –84 dB THD (ADS7887)
• 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

2 Applications
• Base Band Converters in Radio Communication
• Motor Current and Bus Voltage Sensors in Digital
Drives
• Optical Networking (DWDM, MEMS-Based
Switching)
• Optical Sensors
• Battery-Powered Systems
• Medical Instrumentations
• High-Speed Data Acquisition Systems
• High-Speed Closed-Loop Systems

3 Description
The ADS7887 device is a 10-bit, 1.25-MSPS, analogto-
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 powersaving,
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.