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Programmable
DigitalFilter
2.5V
Reference
DS
Modulator
VREFP VREFN REFOUTAVDD DVDD
DGND
AVSS
AINP
AINN
XTAL2
XTAL1/CLKIN
Control
and
Serial
Interface
Clock
Generator
Out-of-Range
Detection
RESETPWDN/
DRDY
SCLK
DIN
START
CS
DOUT
Calibration
Engine
f /8
CLK
SYNCOUT
ADS1259
ADS1259
www.ti.com
SBAS424D –JUNE 2009– REVISED AUGUST 2011
Industrial, 14kSPS, 24-Bit Analog-to-Digital Converter
with Low-Drift Reference
Check for Samples: ADS1259
1
FEATURES
DESCRIPTION
The ADS1259 is a high-linearity, low-drift, 24-bit,
23
• 24 Bits, No Missing Codes
analog-to-digital converter (ADC) designed for the
• Output Data Rates From 10 To 14kSPS
needs of industrial process control, precision
• High Performance:
instrumentation, and other exacting applications.
Combined with a signal amplifier (such as the
– INL: 0.4ppm
PGA280), a high-resolution, high-accuracy
– Reference Drift: 2ppm/°C
measurement system is formed that is capable of
– Gain Drift: 0.5ppm/°C
digitizing a wide range of signals.
– Offset Drift: 0.05μV/°C
The converter uses a fourth-order, inherently stable,
– Noise: 0.7μV
RMS
at 60SPS
delta-sigma (ΔΣ) modulator that provides outstanding
noise and linearity performance. The data rates are
• Simultaneous 50/60Hz Rejection at 10SPS
programmable up to 14kSPS including 10SPS,
• Single-Cycle Settling
50SPS, and 60SPS that provide excellent normal
• Internal Oscillator
mode line-cycle rejection. The digital filter can be
programmed for a fast settling mode where the
• Out-of-Range Detection
conversions settle in a single cycle, or programmed
• Readback Data Integrity by Checksum and
for a high line-cycle rejection mode. A fast responding
Redundant Data Read Capability
input over-range detector flags the conversion data if
• SPI™-Compatible Interface
an input over-range should occur.
• Analog Supply: +5V or ±2.5V
The ADS1259 also provides an integrated low-noise,
• Digital Supply: +2.7V to +5V
very low drift 2.5V reference. The on-chip oscillator,
an external crystal, or an external clock can by used
• Low Power: 13mW
as the ADC clock source.
APPLICATIONS
Data and control communication are handled over a
4MHz, SPI-compatible interface capable of operating
• Industrial Process Control
with a minimum of three wires. Data integrity is
• Scientific Instrumentation
augmented by data bytes checksum and redundant
• Test and Measurement
data read capability. Conversions are synchronized
either by command or by pin.
Dissipating only 13mW in operation, the ADS1259
can be powered down, dissipating less than 25μW.
The ADS1259 is offered in a TSSOP-20 package and
is fully specified from –40°C to +105°C.
RELATED PRODUCTS
FEATURES PRODUCT
24-bit ADC with integrated PGA ADS1256
Wide-range PGA PGA280
High-precision PGA; G = 1, 10, 100, 1000 PGA204
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.
2SPI is a trademark of Motorola.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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