AD7829-1:  3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC

The AD7829-1 is a high speed 8-channel, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 2 MSPS. The AD7829-1 contains an on-chip reference of 2.5 V (2% ...More

AD7829-1:  3 V/5 V, 2 MSPS, 8-Bit, 8-Channel ADC

Product Description

The AD7829-1 is a high speed 8-channel, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 2 MSPS. The AD7829-1 contains an on-chip reference of 2.5 V (2% tolerance); a track/hold amplifier; a 420 ns, 8-bit half-flash ADC; and a high speed parallel interface. The converter can operate from a single 3 V ± 10% and 5 V ± 10% supply.

The AD7829-1 combines the convert start and power-down functions at one pin, that is, the CONVST pin. This allows a unique automatic power-down at the end of a conversion to be implemented. The logic level on the CONVST pin is sampled after the end of a conversion when an EOC (end of conversion) signal goes high, and if it is logic low at that point, the ADC is powered down. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic, the parts are easily mapped into the microprocessor address space.

The EOC pulse allows the ADCs to be used in a stand-alone manner (see the Parallel Interface section).

The AD7829-1 is available in a 28-lead, wide body, small outline IC (SOIC_W) and a 28-lead thin shrink small outline package (TSSOP).

Product Highlights

  1. Fast Conversion Time. The AD7829-1 has a conversion time of 420 ns. Faster conversion times maximize the DSP processing time in a real-time system.
  2. Analog Input Span Adjustment. The VMID pin allows the user to offset the input span. This feature can reduce the requirements of single-supply op amps and take into account any system offsets.
  3. FPBW (Full Power Bandwidth) of Track-and-Hold. The track-and-hold amplifier has excellent high frequency performance. The AD7829-1 is capable of converting fullscale input signals up to a frequency of 10 MHz, making the parts ideally suited to subsampling applications.
  4. Channel Selection. Channel selection is made without the necessity of writing to the part.

Applications

  • Data acquisition systems, DSP front ends
  • Disk drives
  • Mobile communication systems, subsampling applications

    • Features

    • 8-bit half-flash ADC with 420 ns conversion time
    • Eight single-ended analog input channels
      - Available with input offset adjust
    • On-chip track-and-hold
    • SNR performance given for input frequencies up to 10 MHz
    • Automatic power-down at the end of conversion
    • On-chip reference (2.5 V)
    • Wide operating supply range
      - 3 V ± 10% and 5 V ± 10%
    • Input ranges
      - 0 V to 2 V p-p, VDD = 3 V ± 10%
      - 0 V to 2.5 V p-p, VDD = 5 V ± 10%
    • Flexible parallel interface with EOC pulse to allow stand-alone operation

    Diagrams

    AD7829-1 Diagram
    Functional Block Diagram for AD7829-1

    Specifications

    Resolution (Bits) 8bit
    T-Put Rate 2MSPS
    # Chan 8
    Supply V Single(+2.7 to +5.5),Single(+2.7),Single(+3),Single(+3.3),Single(+5)
    Pwr Diss 36mW
    Interface Par
    Ain Range 2 V p-p,2.5V p-p,Uni 2.0V,Uni 2.5V
    SNR (dB) n/a
    Pkg Type SOIC,SOP

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    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7829 8 2MSPS 8 36mW
    AD7829-1 8 2MSPS 8 36mW
    AD7825 8 2MSPS 4 36mW
    AD7278 8 3MSPS 1 19.8mW
    AD7908 8 1MSPS 8 13.5mW
    AD7266 12 2MSPS 12 33.6mW
    AD7277 10 3MSPS 1 19.8mW
    AD7276 12 3MSPS 1 19.8mW
    AD7357 14 4.25MSPS 2 36mW
    AD9212-40 10 40MSPS 8 560mW
    AD9212-65 10 65MSPS 8 833mW
    Pricing, Packaging & Availability

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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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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