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AD7484:  14-Bit, 3 MSPS SAR ADC

Product Details


The AD7484 is a 14-bit, high speed, low power, successive approximation ADC. The part features a parallel interface with throughput rates up to 3 MSPS. The part contains a low noise, wide bandwidth track-and-hold that can handle input frequencies in excess of 40 MHz.

The conversion process is a proprietary algorithmic successive approximation technique that results in no pipeline delays. The input signal is sampled, and a conversion is initiated on the falling edge of the CONVST signal. The conversion process is controlled by an internally trimmed oscillator. Interfacing is via standard parallel signal lines, making the part directly compatible with microcontrollers and DSPs.

The AD7484 provides excellent ac and dc performance specifica-tions. Factory trimming ensures high dc accuracy, resulting in very low INL, offset, and gain errors.

The part uses advanced design techniques to achieve very low power dissipation at high throughput rates. Power consumption in the normal mode of operation is 90 mW. There are two power saving modes: a nap mode, which keeps the reference circuitry alive for a quick power-up while consuming 2.5 mW, and a standby mode that reduces power consumption to a mere 10 μW.

The AD7484 features an on-board 2.5 V reference but can also accommodate an externally provided 2.5 V reference source. The nominal analog input range is 0 V to 2.5 V, but an offset shift capability allows this nominal range to be offset by ±200 mV. This allows the user considerable flexibility in setting the bottom end reference point of the signal range, a useful feature when using single-supply op amps.

The AD7484 also provides an 8% overrange capability via a 15th bit. Therefore, if the analog input range strays outside the nominal range by up to 8%, the user can still accurately resolve the signal by using the 15th bit.

The AD7484 is powered by a 4.75 V to 5.25 V supply. The part also provides a VDRIVE pin that allows the user to set the voltage levels for the digital interface lines. The range for this VDRIVE pin is 2.7 V to 5.25 V. The part is housed in a 48-lead LQFP package and is specified over a −40°C to +85°C temperature range.

Data Sheet, Rev. B, 8/08

FEATURES and BENEFITS

  • Fast throughput rate: 3 MSPS
  • Wide input bandwidth: 40 MHz
  • No pipeline delays with SAR ADC
  • Excellent DC accuracy performance
  • Two parallel interface modes
  • Low power: 90 mW (full power) and 2.5 mW (nap mode)
  • Standby mode: 2 μA maximum
  • See Data Sheet for Additional Information

Functional Block Diagram for AD7484

Documentation

Title Content Type File Type
AD7484: 3 MSPS, 14-Bit SAR ADC Data Sheet (Rev C, 01/2010) (pdf, 469 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
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RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Input Buffer Amplifiers for the AD7484

  • For high supply voltages, low distortion, we recommend the AD829 or the ADA4898-1.
Recommended External References for the AD7484
  • For precision, high current output, we recommend the AD780 or the ADR431.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

Price Table Help

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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