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AD7470:  10-Bit, 2.7 V to 5.25 V, 1.75 MSPS Low Power ADC

Product Details


The AD7470/AD7472 are 10-bit/12-bit high speed, low power, successive-approximation ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS for the 12-bit AD7472 and up to 1.75 MSPS for the 10-bit AD7470. The parts contain a low-noise, wide bandwidth track/hold amplifier which can handle input frequencies in excess of 20 MHz.

The conversion process and data acquisition are controlled using standard control inputs, allowing easy interfacing to microprocessors or DSPs. The input signal is sampled on the falling edge of CONVST, and conversion is also initiated at this point. BUSY goes high at the start of conversion and goes low 531.66 ns after falling edge of CONVST (AD7472 with a clock frequency of 26 MHz) to indicate that the conversion is complete. There are no pipeline delays associated with the parts. The conversion result is accessed via standard CS and RD signals over a high speed parallel interface.

The AD7470/AD7472 use advanced design techniques to achieve very low power dissipation at high throughput rates. With 3 V supplies and 1.5 MSPS throughput rates, the AD7470 typically consumes, on average, just 1.1 mA. With 5 V supplies and 1.75 MSPS, the average current consumption is typically 1.6 mA. The part also offers flexible power/throughput rate management. Operating the AD7470 with 3 V supplies and 500 kSPS throughput reduces the current consumption to 713 μA. At 5 V supplies and 500 kSPS, the part consumes 944 μA.

It is also possible to operate the parts in an auto sleep mode, where the part wakes up to do a conversion and automatically enters sleep mode at the end of conversion. This method allows very low power dissipation numbers at lower throughput rates. In this mode, the AD7472 can be operated with 3 V supplies at 100 kSPS, and consume an average current of just 124 μA. At 5 V supplies and 100 kSPS, the average current consumption is 171 μA.

The analog input range for the part is 0 V to REF IN. The 2.5 V reference is applied externally to the REF IN pin. The conversion rate is determined by the externally-applied clock.

Product Highlights

  1. High Throughput with Low Power Consumption. The AD7470 offers 1.75 MSPS throughput and the AD7472 offers 1.5 MSPS throughput rates with 4 mW power consumption.
  2. Flexible Power/Throughput Rate Management. The conversion rate is determined by an externally-applied clock allowing the power to be reduced as the conversion rate is reduced. The part also features an auto sleep mode to maximize power efficiency at lower throughput rates.
  3. No Pipeline Delay. The part features a standard successive approximation ADC with accurate control of the sampling instant via a CONVST input and once off conversion control.

FEATURES and BENEFITS

  • Specified for VDD of 2.7 V to 5.25 V
  • 1.75 MSPS (10-Bit)
  • Low Power
    3.34 mW Typ at 1.5 MSPS with 3 V Supplies
    7.97 mW Typ at 1.75 MSPS with 5 V Supplies
  • Flexible Power/Throughput Rate Management
  • Wide Input Bandwidth
    70 dB Typ SNR at 500 kHz Input Frequency
  • No Pipeline Delays
  • High Speed Parallel Interface
  • Sleep Mode: 50 nA Typ
  • 24-Lead SOIC and TSSOP Packages

Functional Block Diagram for AD7470

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Documentation

Title Content Type File Type
AD7470/AD7472: 1.75MSPS, 4mW 10-Bit/12-Bit SAR ADC Data Sheet  (Rev B, 10/2003) (pdf, 319 kB) Data Sheets PDF
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation  (pdf, 280 kB) Application Notes PDF
AN-347: Shielding and Guarding  (pdf, 688 kB)
How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach
Application Notes 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 AD7470

  • For low noise, low distortion, wide bandwidth, we recommend the AD8021 or the ADA4899-1.
  • For low noise, low distortion, high slew rate, we recommend the AD8047.
  • For low noise, low distortion, low cost, we recommend the AD8051.
Recommended 2.5V References for the AD7470 Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7470 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7470ARU-REEL Status: Last Time Buy 24 ld TSSOP 24 Ind Reel, 2500 - $3.19 N  Material Info PCN/PDN Purchase
AD7470ARUZ Status: Production 24 ld TSSOP 24 Ind Tube, 62 $3.75 $3.19 Y  Material Info PCN Purchase
AD7470ARUZ-REEL Status: Production 24 ld TSSOP 24 Ind Reel, 2500 - $3.19 Y  Material Info PCN Purchase
AD7470ARUZ-REEL7 Status: Production 24 ld TSSOP 24 Ind Reel, 1000 - $3.19 Y  Material Info PCN Purchase
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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