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AD7938-6:  8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer

Product Details


The AD7938-6 is a 12-bit, high speed, low power, successive approximation (SAR) analog-to-digital converter (ADC). The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 625 kSPS. The part contains a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 50 MHz.

The AD7938-6 features eight analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. The part can operate with either single-ended, fully differential, or pseudo differential 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 initiated at this point.

The AD7938-6 has 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.

The AD7938-6 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also features 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: 625 kSPS
  • Power consumption
    3.6 mW maximum at 625 kSPS with 3 V supplies
    7.5 mW maximum at 625 kSPS 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 with word/byte modes

Functional Block Diagram for AD7938-6

Documentation

Title Content Type File Type
AD7938-6: 8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer Data Sheet  (Rev C, 11/2011) (pdf, 695 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD7938-6 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7938BCPZ-6 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $5.78 $4.91 Y  Material Info PCN Purchase Sample
AD7938BCPZ-6REEL7 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $4.91 Y  Material Info PCN Purchase
AD7938BSUZ-6 Status: Production 32 ld TQFP (7x7mm) 32 Ind Tray, 250 $5.78 $4.91 Y  Material Info PCN Purchase Sample
AD7938BSUZ-6REEL7 Status: Production 32 ld TQFP (7x7mm) 32 Ind Reel, 500 $5.78 $4.91 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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