Catalog
18-Bit, 2 MSPS SAR ADC
Key Features
• 18-bit resolution with no missing codes
• 2.5 V internal low drift referenceThroughput:2 MSPS (Warp mode)1.5 MSPS (Normal mode)
• Differential input range: ± VREF(VREFup to 2.5 V)
• INL: ±2 LSB typical
• No pipeline delay (SAR architecture)
• Parallel (18-, 16-, or 8-bit bus)
• Serial 5 V/3.3 V/2.5 V interface
• SPI®/QSPI™/MICROWIRE™/DSP compatible
• On-board low drift reference with buffer and temperature sensor
• See datasheet for additional features
Description
AI
The AD7641 is a 18-bit, 2 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply. The part contains a high-speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports. It features a very high sampling rate mode (Warp) and a fast mode (Normal) for asynchronous conversion rate applications.The AD7641 is hardware factory calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD) in addition to the more traditional dc parameters of gain, offset and linearity.Operation is specified from −40°C to +85°C.PRODUCT HIGHLIGHTSFast Throughput.The AD7641 is a 2 MSPS, charge redistribution, 18-bit SAR ADC.Superior Linearity.The AD7641 has no missing 18-bit code.Internal Reference.The AD7641 has a 2.048 V internal reference with a typical drift of ±10 ppm/°C and an on-chip TEMP sensor.Single-Supply Operation.The AD7641 operates from a 2.5 V single supply.Serial or Parallel Interface.Versatile parallel (16- or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.APPLICATIONSMedical instrumentsHigh dynamic data acquisitionInstrumentationSpectrum analysisATE
