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ADS7868

更新时间: 2024-09-30 04:48:51
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描述
10-/8-BIT, 3-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS

ADS7868 数据手册

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ADS7884  
ADS7885  
SLAS567MARCH 2008  
10-/8-BIT, 3-MSPS, MICRO-POWER, MINIATURE  
SAR ANALOG-TO-DIGITAL CONVERTERS  
1
FEATURES  
APPLICATIONS  
Base Band Converters in Radio  
Communication  
Motor Current/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-MHz Sample Rate Serial Device  
10-Bit Resolution – ADS7884  
8-Bit Resolution – ADS7885  
Zero Latency  
48-MHz Serial Interface  
Supply Range: 2.7 V to 5.5 V  
Low Power Dissipation:  
6.8 mW at 3-V VDD, 2.5 MSPS  
15 mw at 5-V VDD, 3 MSPS  
±0.3 LSB INL, ±0.3 LSB DNL – ADS7884  
±0.15 LSB INL, ±0.1 LSB DNL – ADS7885  
61.7 dB SINAD, –81 dB THD – ADS7884  
49.8 dB SINAD, –68 dB THD – ADS7885  
Unipolar Input Range: 0 V to VDD  
Powerdown Current: 1 µA  
Wide Input Bandwidth: 30 MHz at 3 dB  
6-Pin SOT23 Package  
DESCRIPTION  
The ADS7884 is a 10-bit, 3-MSPS analog-to-digital converter (ADC), and the ADS7885 is a 8-bit, 3-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 2.7 V to 5.5 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 5.5 V when device supply is 2.7 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 ADS7884 and ADS7885 are available in a 6-pin SOT23 package 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  
3 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  
ADS7884 (2.7 VDD to 5.5 VDD  
)
)
ADS7885 (2.7 VDD to 5.5 VDD  
1
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.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2008, Texas Instruments Incorporated  

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