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AD7451:  Pseudo Differential Input, 1 MSPS, 12-Bit ADC in an 8-Lead SOT-23

Product Details


The AD7441/AD7451 are, respectively, 10-/12-bit high speed, low power, single-supply, successive approximation (SAR), analog-to-digital converters (ADCs) that feature a pseudo differential analog input. These parts operate from a single 2.7 V to 5.25 V power supply and achieve very low power dissipation at high throughput rates of up to 1 MSPS.

The AD7441/AD7451 contain a low noise, wide bandwidth, differential track-and-hold (T/H) amplifier that handles input frequencies up to 3.5 MHz. The reference voltage for these devices is applied externally to the VREF pin and can range from 100 mV to VDD, depending on the power supply and what suits the application.

The conversion process and data acquisition are controlled using overbar: CS and the serial clock, allowing the device to interface with microprocessors or DSPs. The input signals are sampled on the falling edge of overbar: CS when the conversion is initiated. The SAR architecture of these parts ensures that there are no pipeline delays.

Product Highlights

  1. Operation with 2.7 V to 5.25 V Power Supplies.
  2. High Throughput with Low Power Consumption. With a 3 V supply, the AD7441/AD7451 offer 4 mW maxi-mum power consumption for a 1 MSPS throughput rate.
  3. Pseudo 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 Delays.
  7. Accurate Control of Sampling Instant via overbar: CS Input and Once-Off Conversion Control.
  8. ENOB > 10 Bits Typically with 500 mV Reference.

Applications

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

FEATURES and BENEFITS

  • Fast throughput rate: 1 MSPS
  • Specified for VDD of 2.7 V to 5.25 V
  • Low power at maximum throughput rate: 4 mW
    maximum at 1 MSPS with VDD = 3 V 9.25 mW
    maximum at 1 MSPS with VDD = 5 V
  • Wide input bandwidth: 70 dB SINAD at 100 kHz input frequency
  • Pseudo differential analog input
  • Flexible power/serial clock speed management
  • No pipeline delays
  • High speed serial interface: SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Power-down mode: 1 μA maximum
  • 8-lead SOT-23 and MSOP packages

Functional Block Diagram for AD7451

Similar Products

Low Resolution - Single Channel Unipolar/Bipolar 8/10/12-Bit PulSAR ADCs

Documentation

Title Content Type File Type
AD7441/AD7451: Pseudo Differential Input, 1 MSPS, 10-/12-Bit ADCs in an 8-Lead SOT-23 Data Sheet  (Rev D, 03/2010) (pdf, 622 kB) Data Sheets PDF
UG-463: Evaluating the AD7450A and AD7451  (pdf, 1739 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog  (pdf, 1885 kB)
8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD7451

  • For low noise, low distortion, we recommend the ADA4940-1 differential amplifier.
  • For low noise, low cost precision amplifiers, we recommend the AD8655 or the dual AD8656.
Recommended Voltage References for the AD7451
  • For low noise, high accuracy, we recommend the ADR421 or the AD780, 2.5V reference.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7451 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7451ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $5.06 $4.30 Y  Material Info PCN Purchase Sample
AD7451ARTZ-REEL7 Status: Last Time Buy 8 ld SOT-23 8 Ind Reel, 3000 - $4.30 Y  Material Info PCN/PDN Purchase
AD7451BRMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $5.41 $4.60 Y  Material Info PCN Purchase Sample
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.

AD7451 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7451SDZ Status: Production Evaluation Board - Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board $99.00 Yes -

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.

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