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ADS8864

更新时间： 2024-09-17 00:48:35
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德州仪器 - TI /
页数 文件大小 规格书
44页 1291K
描述
18-Bit, 100-kSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter

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ADS8864 数据手册

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ADS8887  
www.ti.com  
SBAS613A –MAY 2013–REVISED DECEMBER 2013  
18-Bit, 100-kSPS, Serial Interface, microPower, Miniature,  
True-Differential Input, SAR Analog-to-Digital Converter  
Check for Samples: ADS8887  
1
FEATURES  
APPLICATIONS  
234  
•
Sample Rate: 100 kHz  
No Latency Output  
•
•
•
•
Automatic Test Equipment (ATE)  
Instrumentation and Process Controls  
Precision Medical Equipment  
•
•
•
•
•
Unipolar, True-Differential Input Range:  
–VREF to +VREF  
Low-Power, Battery-Operated Instruments  
Wide Common-Mode Voltage Range:  
0 V to VREF with 90-dB CMRR (min)  
DESCRIPTION  
The ADS8887 is an 18-bit, 100-kSPS, true-differential  
input, analog-to-digital converter (ADC). The device  
operates with a 2.5-V to 5-V external reference,  
offering a wide selection of signal ranges without  
additional input signal scaling. The reference voltage  
setting is independent of, and can exceed, the analog  
supply voltage (AVDD).  
SPI™-Compatible Serial Interface with  
Daisy-Chain Option  
Excellent AC and DC Performance:  
–
–
–
SNR: 100 dB, THD: –115 dB  
INL: ±1.5 LSB (typ), ±3.0 LSB (max)  
DNL: +1.5 and –1 LSB (max), 18-Bit NMC  
The device offers an SPI-compatible serial interface  
that also supports daisy-chain operation for  
cascading multiple devices.  
•
Wide Operating Range:  
–
–
AVDD: 2.7 V to 3.6 V  
DVDD: 1.65 V to 3.6 V  
(Independent of AVDD)  
The device supports unipolar, true-differential analog  
input signals with a differential input swing of –VREF to  
+VREF. This true-differential analog input structure  
allows for a common-mode voltage of any value in  
the range of 0 V to +VREF (when both inputs are  
within the operating input range of –0.1 V to VREF  
+ 0.1 V).  
–
–
REF: 2.5 V to 5 V (Independent of AVDD)  
Operating Temperature: –40°C to +85°C  
•
Low-Power Dissipation:  
–
–
0.7 mW at 100 kSPS  
70 µW at 10 kSPS  
Device operation is optimized for very low-power  
operation. Power consumption directly scales with  
speed. This feature makes the ADS8887 excellent for  
lower-speed applications.  
•
•
•
Power-Down Current (AVDD): 50 nA  
Full-Scale Step Settling to 18 Bits: 1200 ns  
Packages: MSOP-10 and SON-10  
2.5 V to 5 V 2.7 V to 3.6 V  
True-Differential Input Range  
VDIFF  
Traditional Input Range  
ADS8887 Input Range  
+VREF  
AVDD  
DVDD  
REF  
1.65 V to 3.6 V  
0 V - VREF  
VREF  
AINP  
AINM  
DIN  
SCLK  
VCM  
VCM  
ADS8887  
0 V  
VREF  
DOUT  
0 V  
CONVST  
0 V - VREF  
VREF/2  
GND  
-VREF  
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
3
4
TINA is a trademark of Texas Instruments Inc..  
SPI is a trademark of Motorola Inc.  
All other 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 © 2013, Texas Instruments Incorporated  
 
 
 
 
 
 
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