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AD7457:  Pseudo Differential Input, 100 kSPS, 12-Bit ADC in 8-Lead SOT-23

Product Details


The AD7457 is a 12-bit, low power, successive-approximation (SAR) analog-to-digital converter that features a pseudo differential analog input. This part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 100 kSPS.

The part contains a low-noise, wide bandwidth, differential track and hold amplifier (T/H) which can handle input frequencies in excess of 1 MHz. The reference voltage for the AD7457 is applied externally to the VREF pin and can range from 100mV to VDD, depending on what suits the application.

The conversion process and data acquisition are controlled using CS and the serial clock allowing the device to interface with Microprocessors or DSPs.

The SAR architecture of these parts ensures that there are no pipeline delays.

The AD7457 uses advanced design techniques to achieve very low power dissipation.

FEATURES and BENEFITS

  • Specified for VDD of 2.7 V to 5.25 V
  • Very Low Power:
    - 0.9 mW max at 100 kSPS with VDD = 3V
    - 3 mW max at 100 kSPS with VDD = 5V
  • Pseudo Differential Analog Input
  • 70 dB SINAD at 30 kHz Input Frequency
  • No Pipeline Delays
  • Serial Interface
    - SPI®/QSPI™/MICROWIRE™/DSP
    Compatible
  • Automatic Power-Down Mode
  • 8 Pin SOT-23

Functional Block Diagram for AD7457

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Documentation

Title Content Type File Type
AD7457: Low Power, Pseudo Differential, 100 kSPS 12-Bit ADC in 8-Lead SOT-23 Data Sheet  (Rev A, 02/2005) (pdf, 532 kB) Data Sheets 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

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 AD7457

  • 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 AD7457
  • 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

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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