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ADS7865I

更新时间： 2024-11-28 06:36:27
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
30页 695K
描述
Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling Analog-to-Digital Converter

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ADS7865I 数据手册

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ADS7865  
www.ti.com.............................................................................................................................................................................................. SBAS441–OCTOBER 2008  
Dual, 12-Bit, 3+3 or 2+2 Channel, Simultaneous Sampling  
Analog-to-Digital Converter  
1
FEATURES  
DESCRIPTION  
2
•
Six Pseudo- or Four Fully Differential Inputs  
The ADS7865 is  
a
dual, 12-bit, 2MSPS  
analog-to-digital converter (ADC) with four fully  
differential or six pseudo-differential input channels  
grouped into two pairs for high-speed, simultaneous  
signal acquisition. Inputs to the sample-and-hold  
(S/H) amplifiers are fully differential and are  
maintained differentially to the input of the ADC. This  
architecture provides excellent common-mode  
rejection of 72dB at 100kHz, which is a critical  
performance characteristic in noisy environments.  
•
•
•
SNR: 71.7dB, THD: –87dB  
Programmable Channel Sequencer  
Programmable and Buffered Internal 2.5V  
Reference  
•
•
•
•
Flexible Power-Down Features  
Variable Power-Supply Ranges: 2.7V to 5.5V  
Low-Power Operation: 44mW Maximum at 5V  
Operating Temperature Range:  
–40°C to +125°C  
The ADS7865 is pin-compatible with the ADS7862,  
but offers additional features such as  
a
•
Pin-Compatible Upgrade for the ADS7862  
programmable channel sequencer and reference  
output, flexible supply voltage (2.7V to 5.5V for AVDD  
and BVDD), a pseudo-differential input multiplexer with  
three channels per ADC, and several power-down  
features.  
APPLICATIONS  
•
•
•
Motor Control  
Multi-Axis Positioning Systems  
Three-Phase Power Control  
The ADS7865 is offered in a TQFP-32 package. It is  
specified over the extended operating temperature  
range of –40°C to +125°C.  
SAR  
BVDD  
AVDD  
CHA0+  
DB[11:0]  
CHA0-  
Input  
MUX  
CDAC  
S/H  
CHA1+  
CHA1-  
Comparator  
CS  
CLOCK  
WR  
CHB0+  
CHB0-  
Input  
MUX  
CDAC  
S/H  
RD  
CHB1+  
BUSY  
CHB1-  
Comparator  
CONVST  
REFIN  
BGND  
SAR  
REFOUT  
AGND  
10-Bit DAC  
2.5V Reference  
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.  
2
All trademarks are the property of their respective owners.  
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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