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Analog-to-Digital Converter. ADS1226 Datasheet

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Analog-to-Digital Converter. ADS1226 Datasheet






ADS1226 Converter. Datasheet pdf. Equivalent




ADS1226 Converter. Datasheet pdf. Equivalent





Part

ADS1226

Description

24-Bit Analog-to-Digital Converter



Feature


www.DataSheet4U.com BurrĆBrown Product s from Texas Instruments AD S12 ¨ AD S12 ¨ 25 26 ADS1225 ADS1226 SBA S346 – MAY 2006 24-Bit Analog-to-Dig ital Converter with One- and Two-Channe l Differential Inputs and Internal Osci llator FEATURES • • • • • • • • • • • • • • • • 100SPS Data Rate (High-Speed Mode ) Single-Cycle Settling Easy Conversion Control with STAR.
Manufacture

Burr-Brown

Datasheet
Download ADS1226 Datasheet


Burr-Brown ADS1226

ADS1226; T Pin Automatic Shutdown Low Noise: 4µV RMS Noise (High-Resolution Mode) Input Multiplexer with Two Differential Chann els (ADS1226) Voltage Reference Support s Ratiometric Measurements Self-Calibra ting Simple Read-Only 2-Wire Serial Int erface Internal High-Impedance Input Bu ffer Internal Temperature Sensor Intern al Oscillator Low-Power: 1mW While Oper ating, < 1µA During.


Burr-Brown ADS1226

Shutdown Analog and Digital Supplies: 2 .7V to 5.5V DESCRIPTION The ADS1225 an d ADS1226 are 24-bit delta-sigma analog -to-digital (A/D) converters. They offe r excellent performance, ease-of-use, a nd low power in a small 4mm × 4mm QFN package and are well-suited for demandi ng high-resolution measurements, especi ally in portable and other space-saving and power-constrai.


Burr-Brown ADS1226

ned applications. The ADS1225 and ADS122 6 convert on command using a dedicated START pin. Simply pulse this pin to ini tiate a conversion. Data is read in a s ingle cycle for retrieval over a 2-wire serial interface that easily connects to popular microcontrollers like the MS P430. After the conversion completes, t he ADS1225 and ADS1226 automatically sh uts down all circu.

Part

ADS1226

Description

24-Bit Analog-to-Digital Converter



Feature


www.DataSheet4U.com BurrĆBrown Product s from Texas Instruments AD S12 ¨ AD S12 ¨ 25 26 ADS1225 ADS1226 SBA S346 – MAY 2006 24-Bit Analog-to-Dig ital Converter with One- and Two-Channe l Differential Inputs and Internal Osci llator FEATURES • • • • • • • • • • • • • • • • 100SPS Data Rate (High-Speed Mode ) Single-Cycle Settling Easy Conversion Control with STAR.
Manufacture

Burr-Brown

Datasheet
Download ADS1226 Datasheet




 ADS1226
www.DataSheet4U.com
BurrĆBrown Products
from Texas Instruments
ADS1225 ¨
ADS1226 ¨
ADS1225
ADS1226
SBAS346 – MAY 2006
24-Bit Analog-to-Digital Converter
with One- and Two-Channel Differential Inputs and Internal Oscillator
FEATURES
100SPS Data Rate (High-Speed Mode)
Single-Cycle Settling
Easy Conversion Control with START Pin
Automatic Shutdown
Low Noise: 4µVRMS Noise (High-Resolution
Mode)
Input Multiplexer with Two Differential
Channels (ADS1226)
Voltage Reference Supports Ratiometric
Measurements
Self-Calibrating
Simple Read-Only 2-Wire Serial Interface
Internal High-Impedance Input Buffer
Internal Temperature Sensor
Internal Oscillator
Low-Power: 1mW While Operating, < 1µA
During Shutdown
Analog and Digital Supplies: 2.7V to 5.5V
APPLICATIONS
Hand-Held Instrumentation
Portable Medical Equipment
Industrial Process Control
TEMPEN
AVDD
DESCRIPTION
The ADS1225 and ADS1226 are 24-bit delta-sigma
analog-to-digital (A/D) converters. They offer
excellent performance, ease-of-use, and low power
in a small 4mm × 4mm QFN package and are
well-suited for demanding high-resolution
measurements, especially in portable and other
space-saving and power-constrained applications.
The ADS1225 and ADS1226 convert on command
using a dedicated START pin. Simply pulse this pin
to initiate a conversion. Data is read in a single cycle
for retrieval over a 2-wire serial interface that easily
connects to popular microcontrollers like the
MSP430. After the conversion completes, the
ADS1225 and ADS1226 automatically shuts down all
circuitry.
Internal features include a two-channel multiplexer
(ADS1226), selectable input buffer, temperature
sensor, and oscillator. The full-scale range is defined
by the external voltage reference with support
provided for up to a 5V differential input signal. Two
operating modes allow for speed (100SPS data rate,
15µVRMS noise) or resolution (4µVRMS noise, 16SPS
data rate).
The ADS1225/6 supports 2.7 to 5.5V analog and
digital supplies. Power consumption is 1mW while
converting with 3V supplies. The ADS1225 and
ADS1226 are fully specified over an extended
industrial temperature range of –40°C to +105°C.
VREFP VREFN DVDD
AINP1
AINN1
AINP2
AINN2
MUX
Buffer
START
DS
ADC
Serial Interface
SCLK
DRDY/DOUT
Oscillator
MODE
MUX
ADS1226 Only
BUFEN
GND
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.
All 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 © 2006, Texas Instruments Incorporated




 ADS1226
ADS1225
ADS1226
SBAS346 – MAY 2006
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum located at the end
of this data sheet or see the TI web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted)(1)
AVDD to GND
DVDD to GND
Input current
Analog input voltage to GND
Digital input voltage to GND
Maximum junction temperature
Operating temperature range
Storage temperature range
ADS1225, ADS1226
–0.3 to +6
–0.3 to +6
100, momentary
10, continuous
–0.3 to AVDD +0.3
–0.3 to to AVDD +0.3
+150
–55 to +125
–50 to +150
UNIT
V
V
mA
mA
V
V
°C
°C
°C
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
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 ADS1226
ADS1225
ADS1226
www.ti.com
SBAS346 – MAY 2006
ELECTRICAL CHARACTERISTICS
All specifications at TA = –40°C to +105°C, AVDD = +5V, DVDD = +3V, and VREF = +5V, unless otherwise noted.
ADS1225, ADS1226
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
Analog Input
Full-scale input voltage
Absolute input voltage
AINP – AINN
Buffer off; AINP, AINN with respect to GND
Buffer on; AINP, AINN with respect to GND
GND – 0.1
GND + 0.05
±VREF
AVDD + 0.1
AVDD – 1.5
V
V
V
Differential input impedance
Buffer off
Buffer on
2 M
1 G
Common-mode input impedance
Buffer off
4 M
System Performance
Resolution
24 Bits
Data rate
High-Speed mode
High-Resolution mode
75 100 125 SPS(1)
12 16 22 SPS(1)
Integral nonlinearity (INL)
End-point fit
0.0005
0.0020
% of FSR(2)
Offset error
60 200
µV
Offset error drift
0.3 µV/°C
Gain error
0.004
0.025
%
Gain error drift
0.3 ppm/°C
Common-mode rejection
At DC
85 95
dB
Analog power-supply rejection
At DC, ± 10% in AVDD
95 dB
Digital power-supply rejection
At DC, DVDD = 2.7V to 5.5V
80 dB
Noise
High-Speed mode
High-Resolution mode
1.5
ppm of FSR,
rms
0.4
ppm of FSR,
rms
Temperature Sensor
Temperature sensor voltage
Temperature sensor coefficient
TA = +25°C
106 mV
360 µV/°C
Voltage Reference Input
Reference input voltage
Negative reference input
VREF = VREFP – VREFN
0.5
GND - 0.1
5 AVDD
VREFP – 0.5
V
V
Positive reference input
VREFN + 0.5
AVDD + 0.1
V
Voltage reference impedance
1.5 M
(1) SPS = samples per second.
(2) FSR = full-scale range = 2 × VREF.
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