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AD8138:  Low Distortion Differential ADC Driver

Product Details


The AD8138 is a major advancement over op amps for differential signal processing. The AD8138 can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier. The AD8138 is as easy to use as an op amp, and greatly simplifies differential signal amplification and driving. Manufactured on ADI's proprietary XFCB bipolar process, the AD8138 has a -3 dB bandwidth of 320 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 has a unique internal feedback feature that provides balanced output gain and phase matching, suppressing even order harmonics. The internal feedback circuit also minimizes any gain error that would be associated with the mismatches in the external gain setting resistors.

The AD8138's differential output helps balance the input to differential ADCs, maximizing the performance of the ADC. The AD8138 eliminates the need for a transformer with high performance ADCs, preserving the low frequency and dc information. The common-mode level of the differential output is adjustable by a voltage on the VOCM pin, easily level-shifting the input signals for driving single supply ADCs. Fast overload recovery preserves sampling accuracy.

The AD8138 distortion performance makes it an ideal ADC driver for communication systems, with distortion performance good enough to drive state-of-the-art 10-bit to 16-bit converters at high frequencies. The AD8138's high bandwidth and IP3 also make it appropriate for use as a gain block in IF and baseband signal chains. The AD8138 offset and dynamic performance make it well suited for a wide variety of signal processing and data acquisition applications.

The AD8138 is available in both SOIC and MSOP packages for operation over -40°C to +85°C temperatures.

The AD8138-EP supports defense and aerospace applications (AQEC)

FEATURES and BENEFITS

  • Easy to use, single-ended-to-differential conversion
  • Adjustable output common-mode voltage
  • Externally adjustable gain
  • Low harmonic distortion
    -94 dBc SFDR @ 5 MHz
    -85 dBc SFDR @ 20 MHz
  • -3 dB bandwidth of 320 MHz, G = +1
  • Fast settling to 0.01% of 16 ns
  • Slew rate 1150 V/µs
  • Fast overdrive recovery of 4 ns
  • Low input voltage noise of 5 nV/√Hz
  • 1 mV typical offset voltage
  • Wide supply range +3 V to ±5 V
  • Low power 90 mW on 5 V

AD8138-EP Supports defense and aerospace applications (AQEC)

  • Download AD8138-EP Data Sheet (pdf)
  • Extended temperature range
    −55ºC to +105°C
  • Controlled manufacturing baseline
  • One assembly/test site
  • One fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/12629 DSCC Drawing Number

Pin Configuration Diagram for AD8138

Next Generation Devices

Analog Devices introduces the next generation of Differential Amplifiers, these new amplifiers offer higher performance and lower power consumption than previous devices. Also new in this category, is each of these devices are offered as dual amplifiers, which simplifies designs and reduces board area.

Of Note ...

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Documentation

Title Content Type File Type
AD8138: Low Distortion Differential ADC Driver Data Sheet  (Rev F, 01/2006) (pdf, 489 kB) Data Sheets PDF
AN-1026: High Speed Differential ADC Driver Design Considerations  (pdf, 355 kB) Application Notes PDF
AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications  (pdf, 181 kB) Application Notes PDF
AN-0992: Active Filter Evaluation Board for Differential Amplifiers  (pdf, 85 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-584: Using the AD813X Differential Amplifier  (pdf, 174 kB)
The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage.
Application Notes PDF
CN-0061: DC-Coupled, Single-Ended-to-Differential Conversion Using the AD8138 Low Distortion Differential ADC Driver and AD7357 Dual, 4.2 MSPS, 14-Bit SAR ADC  (pdf, 96 kB) Circuit Note PDF
CN-0041: DC-Coupled, Single-Ended-to-Differential Conversion Using the AD8138 Low Distortion Differential ADC Driver and the AD7356 5 MSPS, 12-Bit SAR ADC  (pdf, 98 kB) Circuit Note PDF
CN-0040: DC-Coupled, Single-Ended-to-Differential Conversion Using the AD8138 Low Distortion Differential ADC Driver and the AD7352 Dual, 3 MSPS, 12-Bit SAR ADC  (pdf, 108 kB) Circuit Note PDF
MT-218: Multiple Feedback Band-Pass Design Example  (pdf, 0) Tutorials PDF
MT-076: Differential Driver Analysis  (pdf, 95 kB) Tutorials PDF
MT-075: Differential Drivers for High Speed ADCs Overview  (pdf, 183 kB) Tutorials PDF
A Stress-Free Method for Choosing High-Speed Op Amps
A decision-tree approach to making the critical decision about high-speed op amp selection, including a look at some helpful tools.
Webcasts WEBCAST
UG-474: Evaluation Board for Differential Amplifiers Offered in 8-Lead SOIC Packages  (PDF, 263 kB) User Guides PDF
UG-130: Differential Amplifier Evaluation Board for 8-lead SOIC and MSOP Packages  (pdf, 493 kB) User Guides PDF
Ask The Application Engineer 36, Wideband A/D Converter Front-End Design Considerations II: Amplifier-or Transformer Drive for the ADC?
(Analog Dialogue, Volume 41 February 2007)
Analog Dialogue HTML
"Rules of the Road" for High-Speed Differential ADC Drivers
(Analog Dialogue, Vol. 43, No. 5, 2009)
Analog Dialogue HTML
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
High Speed Amplifiers Selection Table  (pdf, 77 kB) Product Selection Guide PDF
Aerospace Dice  (pdf, 196 kB)
(Revised 1/2006)
Many Analog Devices products can be purchased as Class K die.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI DiffAmpCalc™
ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.
ADIsim Design/Simulation Tools HTML
AD8138 SPICE Macro-Model SPICE Models 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

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Price, packaging, availability

AD8138 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8138ACHIPS Status: Production CHIPS OR DIE 0 Comm. Tray, 360 - - Y  Material Info Notify Me Contact ADI
AD8138AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.98 $4.39 N  Material Info Notify Me Purchase
AD8138AR-REEL Status: Last Time Buy 8 ld SOIC 8 Ind Reel, 2500 - $4.39 N  Material Info PDN Purchase
AD8138AR-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $4.39 N  Material Info Notify Me Purchase
AD8138ARM Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.98 $4.39 N  Material Info PCN Purchase
AD8138ARM-REEL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - $4.39 N  Material Info PCN/PDN Purchase
AD8138ARM-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $4.39 N  Material Info PCN Purchase
AD8138ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $4.30 $3.75 Y  Material Info PCN Purchase Sample
AD8138ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $3.75 Y  Material Info PCN Purchase
AD8138ARMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $3.75 Y  Material Info PCN Purchase
AD8138ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $4.30 $3.75 Y  Material Info Notify Me Purchase Sample
AD8138ARZ-R7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $3.75 Y  Material Info Notify Me Purchase
AD8138ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $3.75 Y  Material Info Notify Me Purchase
AD8138SRMZ-EP-R7 Status: Production MICRO SOIC 8 Reel, 1000 - $6.75 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.

AD8138 Evaluation Boards
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8138AARM-EBZ Status: Production 8-Lead MSOP Bare Evaluation Board $18.25 Yes -
AD8138AARMZ Status: Production 8-Lead MSOP - Yes -
AD8138AR-EBZ Status: Production 8-Lead SOIC Bare Evaluation Board $18.25 Yes -
AD8138ARZ Status: Production 8-Lead SOIC $5.31 Yes -
AD8138ARM-EBZ Status: Production 8-Lead MSOP Bare Evaluation Board $18.25 Yes -
AD8138ARMZ Status: Production 8-Lead MSOP $5.31 Yes -
AD8138AAR-EBZ Status: Production 8-Lead SOIC Bare Evaluation Board $18.25 Yes -
AD8138AARZ Status: Production 8-Lead SOIC - Yes -

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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