ADS1256IDBT

Part: ADS1255, ADS1256 — Texas Instruments

Type: 24-Bit Analog-to-Digital Converter

Description: Very low-noise, 24-bit delta-sigma ADC with a programmable gain amplifier (PGA) up to 64, data rates up to 30kSPS, and an SPI-compatible serial interface.

Operating Conditions:

• Supply voltage: AVDD = 4.75–5.25 V, DVDD = 1.8–3.6 V
• Operating temperature: -40 to +85 °C
• Master clock rate: 0.1–10 MHz (external oscillator) or 2–10 MHz (external crystal)
• Reference input voltage: 0.5–2.6 V

Absolute Maximum Ratings:

• Max supply voltage (AVDD to AGND): +6 V
• Max supply voltage (DVDD to DGND): +3.6 V
• Max continuous input current: 10 mA
• Max junction temperature: +150 °C
• Max storage temperature: -60 to +150 °C

Key Specs:

• Resolution: 24 Bit
• No missing codes: 24 Bit (all data rates and PGA settings)
• Data rate (f DATA ): 2.5 to 30,000 SPS (f CLKIN = 7.68MHz)
• Integral nonlinearity: ± 0.0010 %FSR (PGA = 1)
• Low-noise PGA gain: 1 to 64
• Differential input impedance (Buffer on): 80 MΩ (f DATA ≤ 50Hz)
• Power dissipation (Normal mode, PGA = 1, Buffer off, DVDD = 3.3V): 38 mW (typ)

Features:

• Up to 23 Bits Noise-Free Resolution
• ± 0.0010% Nonlinearity (max)
• Fast Channel Cycling
• One-Shot Conversions with Single-Cycle Settling
• Flexible Input Multiplexer with Sensor Detect
• Chopper-Stabilized Input Buffer
• Low-Noise PGA: 27nV Input-Referred Noise
• Self and System Calibration for All PGA Settings
• 5V Tolerant SPI-Compatible Serial Interface
• Power dissipation as low as 0.4mW in Standby Mode

Applications:

• Scientific Instrumentation
• Industrial Process Control
• Medical Equipment
• Test and Measurement
• Weigh Scales

Package:

• SSOP-20 (ADS1255)
• SSOP-28 (ADS1256)

• D 24 Bits, No Missing Codes
• -All Data Rates and PGA Settings
• D Up to 23 Bits Noise-Free Resolution
• D ± 0.0010% Nonlinearity (max)
• D Data Output Rates to 30kSPS
• D Fast Channel Cycling
• -18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
• D One-Shot Conversions with Single-Cycle Settling
• D Flexible Input Multiplexer with Sensor Detect
• -Four Differential Inputs (ADS1256 only)
• -Eight Single-Ended Inputs (ADS1256 only)
• D Chopper-Stabilized Input Buffer
• D Low-Noise PGA: 27nV Input-Referred Noise
• D Self and System Calibration for All PGA Settings
• D 5V Tolerant SPI -Compatible Serial Interface
• D Analog Supply: 5V
• D Digital Supply: 1.8V to 3.6V
• D Power Dissipation
• -As Low as 38mW in Normal Mode
• -0.4mW in Standby Mode

• D Scientific Instrumentation
• D Industrial Process Control
• D Medical Equipment
• D Test and Measurement
• D Weigh Scales

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, Inc. All other trademarks are the property of their respective owners.

ADS1256

SBAS288K -JUNE 2003 -REVISED SEPTEMBER 2013

All specifications at -40 ° C to +85 ° C, AVDD = +5V, DVDD = +1.8V, f CLKIN = 7.68MHz, PGA = 1, and V REF = +2.5V, unless otherwise noted.

over operating free-air temperature range unless otherwise noted (1)

(1) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. 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.

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.