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ADS7946

更新时间： 2024-11-09 08:20:03
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德州仪器 - TI 转换器
页数 文件大小 规格书
49页 1327K
描述
14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters

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ADS7946 数据手册

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ADS7945  
ADS7946  
www.ti.com  
SBAS539B –JUNE 2011–REVISED SEPTEMBER 2011  
14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended,  
Ultralow-Power Analog-to-Digital Converters  
Check for Samples: ADS7945, ADS7946  
1
FEATURES  
DESCRIPTION  
The ADS7945/6 are 14-bit, 2 MSPS analog-to-digital  
23  
•
Sample Rate: 2 MSPS  
converters (ADCs), with differential and single-ended  
inputs, respectively. The devices operate at a 2  
MSPS sample rate with a standard 16-clock data  
frame. The devices feature both outstanding dc  
precision and excellent dynamic performance; the  
ADS7946 is pin-compatible with the 8/10/12-bit  
•
14-Bit, Pin-Compatible with 8/10/12-bit  
ADS7947/8/9 Family (ADS7946)  
•
•
Outstanding Performance:  
–
–
–
SNR: 84 dB (ADS7945)  
No Missing Codes  
ADS7947/8/9 devices. The devices include  
a
INL: 1.5 LSB (max) (ADS7945)  
two-channel input multiplexer and low-power  
a
successive approximation register (SAR) ADC with  
an inherent sample-and-hold (S/H) input stage.  
Low Power:  
–
–
11.6 mW at 2 MSPS Operation  
Auto Power-Down at Lower Speeds:  
The ADS7945/6 support a wide analog supply range  
that allows the full-scale input range to extend to ±5 V  
differential or 5 V single-ended. A simple SPI™, with  
a digital supply that can operate as low as 1.65 V,  
allows for easy interfacing to a wide variety of digital  
controllers. Automatic power-down can be enabled  
when operating at slower speeds to dramatically  
reduce power consumption.  
–
–
–
7.2 mW at 500 kSPS  
1.4 mW at 100 kSPS  
0.3 mW at 20 kSPS  
•
Wide Supply Range:  
–
–
Analog: 2.7 V to 5.25 V  
Digital: 1.65 V to AVDD  
Offered in a tiny 3 mm × 3 mm QFN package, the  
ADS7945/6 are fully specified over the extended  
temperature range of –40°C to +125°C and are  
•
•
•
Simple Serial Interface (SPI)  
Fully Specified from –40°C to +125°C  
Tiny Footprint: 3 mm × 3 mm QFN  
suitable for  
a wide variety of data acquisition  
applications where high performance, low power, and  
small package size are key.  
APPLICATIONS  
•
•
•
•
Optical Networking  
Medical Instrumentation  
Battery-Powered Equipment  
Data Acquisition Systems  
AVDD  
REF  
REFGND  
DVDD  
AVDD  
REF  
REFGND  
DVDD  
ADS7945  
ADS7946  
PDEN  
PDEN  
AIN0P  
AIN0  
AIN0N  
AIN0GND  
CS  
CS  
SAR  
SAR  
MUX  
S/H  
SPI  
MUX  
S/H  
SPI  
SCLK  
SDO  
SCLK  
SDO  
ADC  
ADC  
AIN1N  
AIN1P  
AIN1GND  
AIN1  
CH SEL  
CH SEL  
GND  
GND  
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
SPI is a trademark of Motorola.  
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 © 2011, Texas Instruments Incorporated  
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