ADS8028_14 Datasheet, PDF (1/35 Pages) Texas Instruments – 12-Bit, 1-MSPS, 8-Channel, SAR ADC with Internal Reference and Internal Temperature Sensor

ADS8028
www.ti.com
SBAS549B – MAY 2011 – REVISED MARCH 2012
12-Bit, 1-MSPS, 8-Channel, SAR ADC
with Internal Reference and Internal Temperature Sensor
Check for Samples: ADS8028
FEATURES
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•23 Outstanding Performance:
– Throughput: Up to 1 MSPS
– No Missing Codes: 12 Bits
– INL: ±0.5 LSB
– SNR: 72 dB
• Highly Integrated:
– Eight Analog Inputs
– High-Resolution Internal Temperature
Sensor
– Nine-Channel Multiplexer with Channel
Sequencer
– Low-Drift Internal Voltage Reference
• Wide Supply Range:
– Analog Supply (AVDD): 2.7 V to 5.25 V
– Digital Supply (DVDD): 1.65 V to 5.25 V
• Low Power:
– 17 mW at 1 MSPS
– Flexible Power-Down Modes
• SPI™-Compatible Serial Interface: 20 MHz
• Small Footprint: 4-mm × 4-mm, Thin QFN-20
APPLICATIONS
• Programmable Logic Controls (PLCs)
• Industrial Process Controls (IPCs)
• Telecommunications
• Power-Supply Monitoring
• PCB Hot-Spot Analysis
• Battery-Powered Applications
DESCRIPTION
The ADS8028 is a 12-bit analog-to-digital converter
(ADC), capable of operating at sampling speeds up to
1 MSPS. The device is based on a successive
approximation register (SAR) core and provides an
inherent sample-and-hold (SH) front-end.
In addition to having eight analog input channels, the
ADS8028 offers an internal temperature sensor with
0.25°C resolution and an internal voltage reference. A
nine-channel internal multiplexer enables multiple
channels to be selected (including the internal
temperature sensor) that are indefinitely scanned in a
sequential manner. A simple SPI-compatible serial
interface provides easy communication and control
between the device and host controller. The digital
supply can operate from 1.65 V to 5.25 V, enabling
direct interface with a wide range of processors and
controllers.
At full speed of 1 MSPS, the ADS8028 dissipates
only 17 mW. The device offers flexible power-down
modes to save power when conversions are not
being performed. The ADS8028 performance is
specified over the extended industrial temperature
range of –40°C to +125°C.
The ADS8028 is ideal for demanding measurement
applications, such as sensor output monitoring,
power-supply monitoring, and printed circuit board
(PCB) hot-spot analysis, and is available in a small
form-factor QFN-20 package.
AVDD
REF DVDD
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
Internal
Reference
Buffer
SH
ADC
Internal
Temperature
Sensor
Control
Logic
and
Sequencer
SCLK
DOUT
DIN
CS
PD/RST
TM_BUSY
DGND
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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.
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All other trademarks are the property of their respective owners.
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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 © 2011–2012, Texas Instruments Incorporated