content here.
content here.

AD7822:  3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

The AD7822/AD7825/AD7829 are high speed, 1-, 4-, and 8-channel, microprocessor-compatible, 8-bit analog-to-digital converters with a maximum throughput of 2 MSPS. The AD7822/ AD7825/AD7829 contain an on-chip reference of 2.5 V (2% tolerance); a track-and-hold amplifier; a 420 ns, 8-bit half-flash ADC; and a high speed parallel interface. The converters can operate from a single 3 V ± 10% and ...More

AD7822:  3 V/5 V, 2 MSPS, 8-Bit, 1-/4-/8-Channel Sampling ADCs

Product Description

The AD7822/AD7825/AD7829 are high speed, 1-, 4-, and 8-channel, microprocessor-compatible, 8-bit analog-to-digital converters with a maximum throughput of 2 MSPS. The AD7822/ AD7825/AD7829 contain an on-chip reference of 2.5 V (2% tolerance); a track-and-hold amplifier; a 420 ns, 8-bit half-flash ADC; and a high speed parallel interface. The converters can operate from a single 3 V ± 10% and 5 V ± 10% supply.

The AD7822/AD7825/AD7829 combine 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. If it is logic low at that point, the ADC is powered down. The AD7822 and AD7825 also have a separate power-down pin (see the Operating Modes section).

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 AD7822 and AD7825 are available in 20-lead and 24-lead, 0.3" wide, plastic dual in-line packages (PDIP); 20-lead and 24-lead standard small outline packages (SOIC); and 20-lead and 24-lead thin shrink small outline packages (TSSOP). The AD7829 is available in a 28-lead, 0.6" wide PDIP; a 28-lead SOIC; and a 28-lead TSSOP.

Product Highlights

  1. Fast Conversion Time. The AD7822/AD7825/AD7829 have 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 an excellent high frequency performance. The AD7822/AD7825/AD7829 are capable of converting full-scale input signals up to a frequency of 10 MHz. This makes 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

    • RESOURCES & TOOLS

    What is your task? Try Lead the Way AdvisorTM BETA
    • 8-bit half-flash ADC with 420 ns conversion time
    • 1, 4 and 8 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
    • Resolution (Bits): 8bit
    • T-Put Rate: 2MSPS
    • # Chan: 1
    • Supply V: Single(+3),Single(+5)
    • Pwr Diss: 60mW
    • Interface: Par
    • Ain Range: 2 V p-p,2.5V p-p
    • SNR (dB): 48dB
    • Pkg Type: DIP,SOIC,SOP

    Functional Block Diagram for AD7822

    Similar Products

    arrow View Full Interactive Product Selection Table
    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7278 8 3MSPS 1 19.8mW
    AD7822 8 2MSPS 1 60mW
    AD7277 10 3MSPS 1 19.8mW
    AD7825 8 2MSPS 4 36mW
    AD7276 12 3MSPS 1 19.8mW
    AD7829-1 8 2MSPS 8 36mW
    AD775 8 20MSPS 1 85mW
    AD9283-50 8 50MSPS 1 100mW
    AD9280 8 32MSPS 1 110mW
    AD9283-100 8 100MSPS 1 120mW
    AD9057-40 8 40MSPS 1 192mW
    back to top

    Pricing, Packaging & Availability

    Print Table
    back to top

    Help

    Model
    The model number is a specific version of a generic that can be purchased or sampled.

    Status
    Status indicates the current lifecycle of the product. This can be one of 4 stages:
    • Pre-Release: The model has not been released to general production, but samples may be available.
    • Production: The model is currently being produced, and generally available for purchase and sampling.
    • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
    • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
    Package Description
    The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

    For detailed drawings and chemical composition please consult our  Package Site

    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
    Price
    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.

    Production Availability
    This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
    Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    RoHS Compliant
    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    View PCN
    This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

    *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.