04-08-2012, 01:41 PM
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 (ΔΣ) 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 resolution of up to 23 bits noise-free and data rate of up to 30k samples per second (SPS).
Features
• 24 Bits, No Missing Codes
o 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
o 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
o Four Differential Inputs (ADS1256 only)
o 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
o As Low as 38mW in Normal Mode