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ADS8284_14

更新时间： 2024-11-24 02:58:35
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德州仪器 - TI /
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38页 1827K
描述
ADS8284 18-BIT, 1-MSPS, Pseudo-Bipolar Differential SAR ADC with On-Chip ADC Driver (OPA) and 4-Channel Differential Multiplexer

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ADS8284_14 数据手册

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ADS8284  
www.ti.com................................................................................................................................................................................................... SLAS628–MARCH 2009  
18-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC  
DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER  
1
FEATURES  
APPLICATIONS  
•
•
•
•
Medical Imaging/CT Scanners  
Automated Test Equipment  
High-Speed Data Acquisition Systems  
High-Speed Closed-Loop Systems  
•
1.0-MHz Sample Rate, Zero Latency at Full  
Speed  
•
•
18-Bit Resolution  
Supports Pseudo-Bipolar Differential Input  
Range: -4 V to +4 V with 2-V Common-Mode  
DESCRIPTION  
•
Built-In Four Channel, Differential Ended  
Multiplexer; with Channel Count Selection and  
Auto/Manual Mode  
The ADS8284 is  
a
high-performance analog  
system-on-chip (SoC) device with an 18-bit, 1-MSPS  
A/D converter, 4-V internal reference, an on-chip  
ADC driver (OPA), and a 4-channel differential  
multiplexer. The channel count of the multiplexer and  
auto/manual scan modes of the device are user  
selectable.  
•
•
On-Board Differential ADC Driver (OPA)  
Buffered Reference Output to Level Shift  
Bipolar ±4-V Input with External Resistance  
Divider  
•
Reference/2 Output to Set Common-Mode for  
External Signal Conditioner  
The ADC driver is designed to leverage the very high  
noise performance of the differential ADC at optimum  
power usage levels.  
•
•
•
•
18-/16-/8-Bit Parallel Interface  
SNR: 98.4dB Typ at 2-kHz I/P  
THD: –119dB Typ at 2-kHz I/P  
The ADS8284 outputs a buffered reference signal for  
level shifting of a ±4-V bipolar signal with an external  
resistance divider. A Vref/2 output signal is available  
to set the common-mode of a signal conditioning  
circuit. The device also includes an 18-/16-/8-bit  
parallel interface.  
Power Dissipation: 331.25 mW at 1 MSPS  
Including ADC Driver  
•
•
•
Internal Reference  
Internal Reference Buffer  
64-Pin QFN Package  
The ADS8284 is available in a 9 mm x 9 mm, 64-pin  
QFN package and is characterized from -40°C to  
85°C.  
HIGH-SPEED SAR CONVERTER FAMILY  
TYPE/SPEED  
18-Bit Pseudo-Diff  
500 kHz  
~600 kHz  
750 kHz  
1 MHz  
1.25 MHz  
2 MHz  
3 MHz  
4MHz  
ADS8383  
ADS8381  
ADS8481  
ADS8380 (s)  
ADS8382 (s)  
ADS8284  
ADS8482  
ADS8471  
ADS8484  
18-Bit Pseudo-Bipolar, Fully Diff  
16-Bit Pseudo-Diff  
ADS8327  
ADS8328  
ADS8319  
ADS8318  
ADS8370 (s)  
ADS8372 (s)  
ADS8371  
ADS8401  
ADS8405  
ADS8411  
ADS8410 (s)  
ADS8472  
ADS8254  
ADS8402  
ADS8406  
ADS8412  
ADS8422  
ADS7881  
16-Bit Pseudo-Bipolar, Fully Diff  
ADS8413 (s)  
14-Bit Pseudo-Diff  
12-Bit Pseudo-Diff  
ADS7890 (s)  
ADS7891  
ADS7886  
ADS7883  
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 © 2009, Texas Instruments Incorporated  
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