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ADS7946 Datasheet Preview

ADS7946 Datasheet

Analog-to-Digital Converter

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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
FEATURES
1
23 Sample Rate: 2 MSPS
14-Bit, Pin-Compatible with 8/10/12-bit
ADS7947/8/9 Family (ADS7946)
Outstanding Performance:
SNR: 84 dB (ADS7945)
No Missing Codes
INL: 1.5 LSB (max) (ADS7945)
Low Power:
11.6 mW at 2 MSPS Operation
Auto Power-Down at Lower Speeds:
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
Simple Serial Interface (SPI)
Fully Specified from 40°C to +125°C
Tiny Footprint: 3 mm × 3 mm QFN
APPLICATIONS
Optical Networking
Medical Instrumentation
Battery-Powered Equipment
Data Acquisition Systems
DESCRIPTION
The ADS7945/6 are 14-bit, 2 MSPS analog-to-digital
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
ADS7947/8/9 devices. The devices include a
two-channel input multiplexer and a low-power
successive approximation register (SAR) ADC with
an inherent sample-and-hold (S/H) input stage.
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.
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
suitable for a wide variety of data acquisition
applications where high performance, low power, and
small package size are key.
AVDD
REF REFGND DVDD
AVDD
REF REFGND DVDD
AIN0P
AIN0N
MUX
S/H
AIN1N
AIN1P
SAR
ADC
ADS7945
SPI
PDEN
CS
SCLK
SDO
CH SEL
AIN0
AIN0GND
AIN1GND
AIN1
MUX
S/H
SAR
ADC
ADS7946 PDEN
CS
SPI
SCLK
SDO
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.
SPI is a trademark of Motorola.
2
All other trademarks are the property of their respective owners.
3
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




etcTI

ADS7946 Datasheet Preview

ADS7946 Datasheet

Analog-to-Digital Converter

No Preview Available !

ADS7945
ADS7946
SBAS539B JUNE 2011 REVISED SEPTEMBER 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PRODUCT
ADS7945
ADS7946
ADS7947
ADS7948
ADS7949
FAMILY AND ORDERING INFORMATION(1)
RESOLUTION (Bits)
14
14
12
10
8
INPUT
Unipolar, differential
Unipolar, single-ended
Unipolar, single-ended
Unipolar, single-ended
Unipolar, single-ended
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range, unless otherwise noted.
AINxP to GND or AINxN to GND (ADS7945)
AINx to GND (ADS7946)
AINxGND to GND (ADS7946)
AVDD to GND or DVDD to GND
Digital input voltage to GND
Digital output to GND
Operating temperature range
Storage temperature range
Human body model (HBM)
ESD ratings
Charged device model (CDM)
Machine model (MM)
VALUE
0.3 to AVDD + 0.3
0.3 to AVDD + 0.3
0.3 to +0.3
0.3 to 7
0.3 to DVDD + 0.3
0.3 to DVDD + 0.3
40 to +125
65 to +150
2000
500
200
UNIT
V
V
V
V
V
V
°C
°C
V
V
V
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under electrical characteristics is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2
Submit Documentation Feedback
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): ADS7945 ADS7946



Part Number ADS7946
Description Analog-to-Digital Converter
Maker etcTI
Total Page 3 Pages
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ADS7946 Datasheet PDF





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