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SBAS424C – JUNE 2009 – REVISED MARCH 2010
Industrial, 14kSPS, 24-Bit Analog-to-Digital Converter
with Low-Drift Reference
Check for Samples:
1
FEATURES
24 Bits, No Missing Codes
Output Data Rates From 10 To 14kSPS
High Performance:
– INL: 0.4ppm
– Reference Drift: 2ppm/°C
– Gain Drift: 0.5ppm/°C
– Offset Drift: 0.05mV/°C
– Noise: 0.7mV
RMS
at 60SPS
Simultaneous 50/60Hz Rejection at 10SPS
Single-Cycle Settling
Internal Oscillator
Out-of-Range Detection
Readback Data Integrity by Checksum and
Redundant Data Read Capability
SPI™-Compatible Interface
Analog Supply: +5V or ±2.5V
Digital Supply: +2.7V to +5V
Low Power: 13mW
DESCRIPTION
The ADS1259 is a high-linearity, low-drift, 24-bit,
analog-to-digital converter (ADC) designed for the
needs of industrial process control, precision
instrumentation, and other exacting applications.
Combined with a signal amplifier (such as the
a
high-resolution,
high-accuracy
measurement system is formed that is capable of
digitizing a wide range of signals.
The converter uses a fourth-order, inherently stable,
delta-sigma (ΔΣ) modulator that provides outstanding
noise and linearity performance. The data rates are
programmable up to 14kSPS including 10SPS,
50SPS, and 60SPS that provide excellent normal
mode line-cycle rejection. The digital filter can be
programmed for a fast settling mode where the
conversions settle in a single cycle, or programmed
for a high line-cycle rejection mode. A fast responding
input over-range detector flags the conversion data if
an input over-range should occur.
The ADS1259 also provides an integrated low-noise,
very low drift 2.5V reference. The on-chip oscillator,
an external crystal, or an external clock can by used
as the ADC clock source.
Data and control communication are handled over a
4MHz, SPI-compatible interface capable of operating
with a minimum of three wires. Data integrity is
augmented by data bytes checksum and redundant
data read capability. Conversions are synchronized
either by command or by pin.
XTAL1/CLKIN
XTAL2
RESET/PWDN
START
Control
and
Serial
Interface
DRDY
SCLK
DIN
DOUT
ADS1259
CS
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APPLICATIONS
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Industrial Process Control
Scientific Instrumentation
Test and Measurement
AVDD
VREFP
VREFN REFOUT
SYNCOUT
DVDD
2.5V
Reference
f
CLK
/8
Clock
Generator
AINP
AINN
DS
Modulator
Programmable
Digital Filter
Calibration
Engine
Dissipating only 13mW in operation, the ADS1259
can be powered down, dissipating less than 25mW.
The ADS1259 is offered in a TSSOP-20 package and
is fully specified from –40°C to +105°C.
RELATED PRODUCTS
FEATURES
24-bit ADC with integrated PGA
Wide-range PGA
High-precision PGA; G = 1, 10, 100, 1000
PRODUCT
Out-of-Range
Detection
AVSS
DGND
1
2
3
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.
All other trademarks are the property of their respective owners.
Copyright © 2009–2010, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
