ADS7947_14 Datasheet, PDF (1/39 Pages) Texas Instruments – 12/10/8-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-Differential, Ultralow-Power SAR Analog-to-Digital Converters

ADS7947
ADS7948
ADS7949
www.ti.com
SLAS708 – SEPTEMBER 2010
12/10/8-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-Differential, Ultralow-Power
SAR Analog-to-Digital Converters
Check for Samples: ADS7947 , ADS7948, ADS7949
FEATURES
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•23 Sample Rate: 2MSPS
• Pin-Compatible Family: 12/10/8-Bit
• Outstanding Performance:
– No Missing Codes
– INL: 1LSB (max)
– SNR: 72dB (min)
• Low Power:
– 7.5mW at 2MSPS Operation
– Auto Power-Down at Lower Speeds:
– 3.8mW at 500kSPS
– 0.8mW at 100kSPS
– 0.16mW at 20kSPS
• Wide Supply Range:
– Analog: 2.7V to 5.5V
– Digital: 1.65V to AVDD
• Simple Serial Interface (SPI)
• Fully Specified from –40°C to +125°C
• Tiny Footprint: 3mm × 3mm QFN
APPLICATIONS
• Communication Systems
• Optical Networking
• Medical Instrumentation
• Battery-Powered Equipment
• Data Acquisition Systems
AVDD
DESCRIPTION
The ADS7947/8/9 are 12-bit, 10-bit, and 8-bit 2MSPS
analog-to-digital converters (ADCs), respectively.
Devices operate at 2MSPS sample rate with a
standard 16 clock data frame. In addition, it is
possible to operate the ADS7947 (12-bit) at
2.1MSPS, the ADS7948 (10-bit) at 2.57MSPS, and
the ADS7949 (8-bit) at 3MSPS with a short data
frame optimized for the number of clocks sufficient for
conversion with no drop in performance. The devices
feature both outstanding dc precision and excellent
dynamic performance, this family of pin-compatible
devices includes 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 ADS7947/8/9 support a wide analog supply
range that allows the full-scale input range to extend
to 5V. A simple SPI™, with a digital supply that can
operate as low as 1.65V, 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 3mm × 3mm QFN package, the
ADS7947/8/9 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 size are key.
REF REFGND DVDD
AIN0P
AIN0N
AIN1P
AIN1N
MUX
S/H
SAR
ADC
GND
PDEN
CS
SPI
SCLK
SDO
CH SEL
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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 © 2010, Texas Instruments Incorporated