ADS1255 ADS1256 Very Low Noise, 24-Bit Analog-to-Digital Converter
●DESCRIPTION
■The ADS1255 and ADS1256 are extremely low-noise,24-bit analog-to-digital (A/D) converters. They provide complete high-resolution measurement solutions for the most demanding applications.
■The converter is comprised of a 4th-order, delta-sigma (∆Σ) modulator followed by a programmable digital filter. A flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The selectable input buffer greatly increases the input impedance and the low-noise programmable gain amplifier (PGA) provides gains from 1 to 64 in binary steps. The programmable filter allows the user to optimize between a resolution of up to 23 bits noise-free and a data rate of up to 30k samples per second (SPS). The converters offer fast channel cycling for measuring multiplexed inputs and can also perform one-shot conversions that settle in just a single cycle.
■Communication is handled over an SPI-compatible serial interface that can operate with a 2-wire connection. Onboard calibration supports both self and system correction of offset and gain errors for all the PGA settings. Bidirectional digital I/Os and a programmable clock output driver are provided for general use. The ADS1255 is packaged in an SSOP-20, and the ADS1256 in an SSOP-28.
●FEATURES
■24 Bits, No Missing Codes
▲All Data Rates and PGA Settings
■Up to 23 Bits Noise-Free Resolution
■±0.0010% Nonlinearity (max)
■Data Output Rates to 30kSPS
■Fast Channel Cycling
▲18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
■One-Shot Conversions with Single-Cycle Settling
■Flexible Input Multiplexer with Sensor Detect
▲Four Differential Inputs (ADS1256 only)
▲Eight Single-Ended Inputs (ADS1256 only)
■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
■Analog Supply: 5V
■Digital Supply: 1.8V to 3.6V
■Power Dissipation
▲As Low as 38mW in Normal Mode
▲0.4mW in Standby Mode
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ADS1256 、 ADS1255 、 ADS1255IDBT 、 ADS1255IDBR 、 ADS1256IDBT 、 ADS1256IDBR 、 ADS1255IDB 、 ADS1256IDB |
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Analog-to-Digital Converter 、 A/D converters 、 high resolution converter |
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[ Weigh Scales ][ Scientific Instrumentation ][ Industrial Process Control ][ Medical Equipment ][ Test ][ Measurement ] |
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Datasheet |
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Please see the document for details |
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SSOP-20;SSOP-28 |
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English Chinese Chinese and English Japanese |
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AUGUST 2004 |
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SBAS288D |
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592 KB |
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