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AD7934:  4-Channel, 1.5 MSPS, 12-Bit Parallel ADC with a Sequencer

Product Details


The AD7933/AD7934 are 10-bit and 12-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 handles input frequencies up to 50 MHz.

The AD7933/AD7934 feature four analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be sequentially converted. These parts can accept either single-ended, fully differential, or pseudo differential analog inputs.

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

The AD7933/AD7934 has an accurate on-chip 2.5 V reference that is 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.
  • Four 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
  • Specified for VDD of 2.7 V to 5.25 V
  • Low power
    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
    4-channel single-ended inputs
    2-channel fully differential inputs
    2-channel pseudo differential inputs
  • 4 analog input channels with a sequencer
  • Accurate on-chip 2.5 V reference ±0.2% maximum @ 25°C, 25 ppm/°C maximum (AD7934)
  • 70 dB SINAD at 50 kHz input frequency
  • No pipeline delays
  • High speed parallel interface—word/byte modes
  • Full shutdown mode: 2 μA maximum
  • 28-lead TSSOP package

Functional Block Diagram for AD7934

Documentation

Title Content Type File Type
AD7933/AD7934: 4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer Data Sheet  (Rev B, 02/2007) (pdf, 761 kB) Data Sheets PDF
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

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 AD7934

  • For a single-ended input drive, we recommend the AD8021 or the dual AD8022.
Recommended External Voltage References for the AD7934
  • 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

AD7934 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7934BRU Status: Production 28 ld TSSOP (4.4mm) 28 Ind Tube, 50 $9.77 $8.30 N  Material Info PCN Purchase
AD7934BRU-REEL Status: Last Time Buy 28 ld TSSOP (4.4mm) 28 Ind Reel, 2500 - $8.30 N  Material Info PCN/PDN Purchase
AD7934BRUZ Status: Production 28 ld TSSOP (4.4mm) 28 Ind Tube, 50 $8.45 $7.19 Y  Material Info PCN Purchase Sample
AD7934BRUZ-REEL7 Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 1000 - $7.19 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.


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