AD7440

Differential Input, 1 MSPS, 12- (AD7450A) & 10-Bit (AD7440) ADCs
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Product Details

The AD7440/AD7450A are 10-bit and 12-bit high speed, low power, successive approximation (SAR) analog-to-digital converters with a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and use advanced design techniques to achieve very low power dissipation at throughput rates up to 1 MSPS. The SAR architecture of these parts ensures that there are no pipeline delays.

The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier (T/H) that can handle input frequencies up to 3.5 MHz. The reference voltage is applied externally to the VREF pin and can be varied from 100 mV to 3.5 V depending on the power supply and what suits the application. The value of the reference voltage determines the common-mode voltage range of the part. With this truly differential input structure and variable reference input, the user can select a variety of input ranges and bias points.

The conversion process and data acquisition are controlled using CS and the serial clock, allowing the device to interface with microprocessors or DSPs. The input signals are sampled on the falling edge of CS; the conversion is also initiated at this point. The SAR architecture of these parts ensures that there are no pipeline delays. The AD7440 and the AD7450A use advanced design techniques to achieve very low power dissipation at high throughput rates.

Product Highlights

  1. Operation with either 3 V or 5 V power supplies.
  2. High throughput with low power consumption.
    With a 3 V supply, the AD7440/AD7450A offer 4 mW max power consumption for 1 MSPS throughput.
  3. Fully differential analog input.
  4. Flexible power/serial clock speed management.
    The conversion rate is determined by the serial clock, allowing the power to be reduced as the conversion time is reduced through the serial clock speed increase.These parts also feature a shutdown mode to maximize power efficiency at lower throughput rates.
  5. Variable voltage reference input.
  6. No pipeline delay.
  7. Accurate control of the sampling instant via a CS input and once-off conversion control.
  8. ENOB > eight bits typically with 100 mV reference.

Applications

  • Transducer interface
  • Battery-powered systems
  • Data acquisition systems
  • Portable instrumentation
  • Motor control

MICROWIRE is a trademark of National Semiconductor Corporation.
SPI and QSPI are trademarks of Motorola, Inc.

Product Lifecycle

checked 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.

Documentation

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Product Recommendations

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AD7440 Companion parts

Recommended Precision Voltage References

  • For a 2.5V reference , we recommend the ADR421 or the ADR441 .
  • For a 2.048V reference , we recommend the ADR420 or the ADR440 .
  • For a 2.5V/3V reference , we recommend the AD780 .

Recommended Driver Amplifiers

  • For ultra low distortion, low power differential amplifier , we recommend the ADA4940-1 .
  • For low noise, low cost, precision amplifier , we recommend the AD8655 or the AD8656 .

Reference Materials

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Design Resources

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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.

AD7440 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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