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AD7939:  8-Channel, 1.5 MSPS, 10-Bit Parallel ADCs with a Sequencer

Product Details


The AD7938/AD7939 are 12-bit and 10-bit, high speed, low power, successive approximation (SAR) analog-to-digital converters (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. The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 50 MHz.

The AD7938/AD7939 feature eight analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. These parts can operatewith either single-ended, fully differential, or pseudodifferential analog inputs.

The conversion process and data acquisition are controlled using standard control inputs that allow easy interfacing with microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point.

The AD7938/AD7939 have an accurate on-chip 2.5 V reference that can be used as the reference source for the analog-to-digital conversion. Alternatively, this pin can be overdriven to provide an external reference.

These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip control register allows the user to set up different operating conditions, including analog input range and configuration, output coding, power management, and channel sequencing.

Product Highlights

  • High throughput with low power consumption.
  • Eight analog inputs with a channel sequencer.
  • Accurate on-chip 2.5 V reference.
  • Single-ended, pseudo differential, or fully differential analog inputs that are software selectable.
  • Single-supply operation with VDRIVE function. The VDRIVE function allows the parallel interface to connect directly to 3 V or 5 V processor systems independent of VDD.
  • No pipeline delay.
  • Accurate control of the sampling instant via a CONVST input and once-off conversion control.

FEATURES and BENEFITS

  • Throughput rate: 1.5 MSPS
  • Power consumption
    6 mW maximum at 1.5 MSPS with 3 V supplies
    13.5 mW maximum at 1.5 MSPS with 5 V supplies
  • Software-configurable analog inputs
    8-channel single-ended inputs
    4-channel fully differential inputs
    4-channel pseudo differential inputs
    7-channel pseudo differential inputs
  • Specified for VDD of 2.7 V to 5.25 V
  • 8 analog input channels with a sequencer
  • Accurate on-chip 2.5 V reference ±0.2% maximum @ 25°C, 25 ppm/°C maximum
  • 70 dB SINAD at 50 kHz input frequency
  • No pipeline delays High speed parallel interface—word/byte modes
  • Full shutdown mode: 2 μA maximum
  • 32-lead LFCSP and TQFP packages

Functional Block Diagram for AD7939

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Documentation

Title Content Type File Type
AD7938/AD7939: 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Data Sheet  (Rev C, 10/2011) (pdf, 738 kB) Data Sheets PDF
Interfacing the AD9739A FMC board to Xilinx FPGA platforms
AD9739A FMC board, is a 14-bit D/A converter that enables cable TV and broadband operators to synthesize the entire cable spectrum up to 1 GHz into a single RF (radio frequency) port on the Xilinx Virtex-6 ML605, Kintex-7 KC705, and Virtex-7 VC707.
Videos HTML
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Maximize Performance When Driving Differential ADCs
... Converting a single-ended signal to a differential signal before the analog-to-digital conversion can improve the performance of your data-acquisition system. By Sally Paterson, Analog Devices (EDN, 6/12/2003)
Technical Articles HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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 AD7939

  • For a single-ended input drive, we recommend the AD8021 or the dual AD8022.
Recommended External Voltage References for the AD7939
  • For a precision 2.5V/3.0V reference, we recommend the AD780.
  • For a precision 2.5V reference, we recommend the ADR421.
  • For a precision 2.048V reference, we recommend the ADR420.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7939 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7939BCPZ Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $4.46 $3.80 Y  Material Info PCN Purchase Sample
AD7939BCPZ-REEL7 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $3.80 Y  Material Info PCN Purchase
AD7939BSUZ Status: Production 32 ld TQFP (7x7mm) 32 Ind Tray, 250 $4.46 $3.80 Y  Material Info PCN Purchase Sample
AD7939BSUZ-REEL7 Status: Production 32 ld TQFP (7x7mm) 32 Ind Reel, 500 - $3.80 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.

AD7938/AD7938-6/AD7939 Evaluation kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7938CBZ Status: Last Time Buy Evaluation Board - Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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