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AD7722:  CMOS, 16-Bit, 195 kSPS Sigma-Delta ADC

The AD7722 is a complete low power, 16-bit, sigma-delta ADC. The part operates from a +5 V supply and accepts a differential input voltage range of 0 V to +2.5 V or ±1.25 V centered around a common-mode bias. The AD7722 provides 16-bit performance for input bandwidths up to 90.625 kHz. The part provides data at an output word rate of 195.3 kHz.

The analog input is continuously sampled by ...More

AD7722:  CMOS, 16-Bit, 195 kSPS Sigma-Delta ADC

Product Description

The AD7722 is a complete low power, 16-bit, sigma-delta ADC. The part operates from a +5 V supply and accepts a differential input voltage range of 0 V to +2.5 V or ±1.25 V centered around a common-mode bias. The AD7722 provides 16-bit performance for input bandwidths up to 90.625 kHz. The part provides data at an output word rate of 195.3 kHz.

The analog input is continuously sampled by an analog modulator eliminating the need for external sample-and-hold circuitry. The modulator output is processed by two Finite Impulse Response (FIR) digital filters in series. The on-chip filtering reduces the external antialias requirements to first order, in most cases. The group delay for the filter is 215.5 µs, while the settling time for a step input is 431 µs. The sample rate, filter corner frequency, and output word rate are set by an external clock that is nominally 12.5 MHz.

Use of a single bit DAC in the modulator guarantees excellent linearity and dc accuracy. Endpoint accuracy is ensured by on-chip calibration. This calibration procedure minimizes the zero-scale and full-scale errors.

Conversion data is provided at the output register through a flexible serial port or a parallel port. This offers 3-wire, high speed interfacing to digital signal processors. The serial interface operates in an internal clocking (master) mode, whereby an internal serial data clock and framing pulse are device outputs. Additionally, two AD7722s can be configured with the serial data outputs connected together. Each converter alternately transmits its conversion data on a shared serial data line.

The part provides an accurate on-chip 2.5 V reference. A reference input/output function is provided to allow either the internal reference or an external system reference to be used as the reference source for the part.

The AD7722 is available in a 44-pin PQFP package and is specified over the industrial temperature range from –40°C to +85°C.

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  • 16-Bit Σ-Δ ADC
    - 64 x Oversampling Ratio
    - Up to 220 kSPS Output Word Rate
    - Low-Pass, Linear Phase Digital Filter
  • Inherently Monotonic
  • On-Chip 2.5 V Voltage Reference
  • Single-Supply 5 V
  • High Speed Parallel or Serial Interface
  • Resolution (Bits): 16bit
  • T-Put Rate: 195.3kSPS
  • # Chan: 1
  • Supply V: Single(+5)
  • Pwr Diss: 375mW
  • Interface: Par,Ser
  • Ain Range: (Vref) p-p,2.5V p-p,Uni (Vref),Uni 2.5V
  • SNR (dB): n/a
  • Pkg Type: QFP

Functional Block Diagram for AD7722

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AD7612 16 750KSPS 1 230mW
AD7621 16 3MSPS 1 86mW
AD7622 16 2MSPS 1 85mW
AD7623 16 1.33MSPS 1 55mW
AD7625 16 6MSPS 1 145mW
AD7626 16 10MSPS 1 150mW
AD7650 16 570KSPS 1 115mW
AD7652 16 500KSPS 1 90mW
AD7653 16 1MSPS 1 145mW
AD7980 16 1MSPS 1 10mW
AD7663 16 250KSPS 1 41mW
AD7664 16 570KSPS 1 115mW
AD7665 16 570KSPS 1 107mW
AD7666 16 500KSPS 1 90mW
AD7667 16 1MSPS 1 145mW
AD7671 16 1MSPS 1 125mW
AD7676 16 500KSPS 1 74mW
AD7677 16 1MSPS 1 130mW
AD7401 16 20MSPS 1 100mW
AD7401A 16 20MSPS 1 105mW
AD7686 16 500KSPS 1 21.5mW
AD7687 16 250KSPS 1 12.5mW
AD7688 16 500KSPS 1 21.5mW
AD7693 16 500KSPS 1 21.5mW
AD7694 16 250KSPS 1 6.3mW
AD7720 16 12.5MSPS 1 215mW
AD7721 16 468.75KSPS 1 150mW
AD7722 16 195.3KSPS 1 375mW
AD9261-10 16 160MSPS 1 375mW
AD976A 16 200KSPS 1 100mW
AD977A 16 200KSPS 1 100mW
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Model
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Status
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  • 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.

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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.