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AD7641: 18-Bit, 2 MSPS SAR ADC Data Sheet (Rev. A)1/1/2006PDF666 kB
Alternative Parts
Overview
Features and Benefits
- 18-bit resolution with no missing codes
- 2.5 V internal low drift reference
Throughput:
2 MSPS (Warp mode)
1.5 MSPS (Normal mode) - Differential input range: ± VREF (VREF up 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
Product Details
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 HIGHLIGHTS
- Fast 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.
APPLICATIONS
- Medical instruments
- High dynamic data acquisition
- Instrumentation
- Spectrum analysis
- ATE
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)2/14/2015PDF299 kB
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AN-932: Power Supply Sequencing2/1/2008
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8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog3/8/2008PDF1885 kB
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Designing Power Supplies for High Speed ADC2/1/2012
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Which ADC Architecture Is Right for Your Application?6/1/2005 Analog Dialogue
Product Recommendations
AD7641 Companion Parts
Recommended Driver Amplifiers
- For a fully differential attenuating precision amplifier: AD8475.
- For single-ended to differential driver applications: AD8139, ADA4930-1.
- For low noise, low distortion, low power: ADA4841-1.
- For low noise, high gain bandwidth: AD8021, ADA4899-1, AD8022.
Recommended External Voltage References
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
Support & Discussions
AD7641 Discussions
Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.