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ADS7887

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10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS

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ADS7887  
ADS7888  
SLAS468–JUNE 2005  
10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE  
SAR ANALOG-TO-DIGITAL CONVERTERS  
FEATURES  
APPLICATIONS  
•
•
•
Base Band Converters in Radio Communi-  
cation  
Motor Current/Bus Voltage Sensors in Digital  
Drives  
Optical Networking (DWDM, MEMS Based  
Switching)  
•
•
•
•
•
•
•
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  
•
•
•
•
•
Optical Sensors  
Battery Powered Systems  
Medical Instrumentations  
High-Speed Data Acquisition Systems  
High-Speed Closed-Loop Systems  
– 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  
DESCRIPTION  
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 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 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.  
Micro-Power Miniature SAR Converter Family  
BIT  
12-Bit  
< 300 KSPS  
ADS7866 (1.2 VDD to 3.6 VDD  
ADS7867 (1.2 VDD to 3.6 VDD  
ADS7868 (1.2 VDD to 3.6 VDD  
300 KSPS – 1.25 MSPS  
)
)
)
ADS7886 (2.35 VDD to 5.25 VDD  
ADS7887 (2.35 VDD to 5.25 VDD  
ADS7888 (2.35 VDD to 5.25 VDD  
)
)
)
10-Bit  
8-Bit  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2005, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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