LT1994 - Low Noise, Low Distortion Fully Differential Input/Output Amplifier/Driver

Features

  • Fully Differential Input and Output
  • Wide Supply Range: 2.375V to 12.6V
  • Rail-to-Rail Output Swing
  • Low Noise: 3nV/√Hz
  • Low Distortion, 2VP-P, 1MHz: –94dBc
  • Adjustable Output Common Mode Voltage
  • Unity Gain Stable
  • Gain-Bandwidth: 70MHz
  • Slew Rate: 65V/μs
  • Large Output Current: 85mA
  • DC Voltage Offset <2mV MAX
  • Open-Loop Gain: 100V/mV
  • Low Power Shutdown
  • 8-Pin MSOP or 3mm × 3mm DFN Package

Typical Application

LT1994 Typical Application
LT1994 Typical Application

Description

The LT1994 is a high precision, very low noise, low distortion, fully differential input/output amplifier optimized for 3V, single supply operation. The LT1994’s output common mode voltage is independent of the input common mode voltage, and is adjustable by applying a voltage on the VOCM pin. A separate internal common mode feedback path provides accurate output phase balancing and reduced even-order harmonics. This makes the LT1994 ideal for level shifting ground referenced signals for driving differential input, single supply ADCs.

The LT1994 output can swing rail-to-rail and is capable of sourcing and sinking up to 85mA. In addition to the low distortion characteristics, the LT1994 has a low input referred voltage noise of 3nV/√Hz. This part maintains its performance for supply voltages as low as 2.375V. It draws only 13.3mA of supply current and has a hardware shutdown feature that reduces current consumption to 225μA.

The LT1994 is available in an 8-pin MSOP or 8-pin DFN package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1994CDD#PBF 3x3 DFN-8 DD C 05-08-1698 Yes
LT1994CDD#TRPBF 3x3 DFN-8 DD C 05-08-1698 Yes
LT1994CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1994CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1994HDD#PBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT1994HDD#TRPBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT1994IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT1994IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT1994IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LT1994IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LT1994MPDD#PBF 3x3 DFN-8 DD MP 05-08-1698 Yes
LT1994MPDD#TRPBF 3x3 DFN-8 DD MP 05-08-1698 Yes


LT1994 Package Drawing
LT1994 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1994CDD#PBF 3x3 DFN-8 C $2.35 $1.65 Yes
LT1994CDD#TRPBF 3x3 DFN-8 C $1.71 Yes
LT1994CMS8#PBF MS-8 C $2.35 $1.65 Yes
LT1994CMS8#TRPBF MS-8 C $1.71 Yes
LT1994HDD#PBF 3x3 DFN-8 H $2.70 $1.90 Yes
LT1994HDD#TRPBF 3x3 DFN-8 H $1.96 Yes
LT1994IDD#PBF 3x3 DFN-8 I $2.70 $1.90 Yes
LT1994IDD#TRPBF 3x3 DFN-8 I $1.96 Yes
LT1994IMS8#PBF MS-8 I $2.70 $1.90 Yes
LT1994IMS8#TRPBF MS-8 I $1.96 Yes
LT1994MPDD#PBF 3x3 DFN-8 MP $6.75 $4.84 Yes
LT1994MPDD#TRPBF 3x3 DFN-8 MP $4.90 Yes
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* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1058A-A Combo Demoboard for LTC2203 and LT1994, req. DC718 $200.00
DC961B LT1994 Low Noise, Low Distortion, Fully Differential Amplifier/Driver $50.00
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Companion Boards

Part Number Description Price Documentation
DC718C USB Data Acquisition Controller, for PScope Evaluation Kits (<135Mbps) $300.00
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Click here to view our complete list of demo boards

Applications

  • Differential Input A/D Converter Driver
  • Single-Ended to Differential Conversion
  • Differential Amplifier cation with Common Mode Translation
  • Rail-to-Rail Differential Line Driver/Receiver
  • Low Voltage, Low Noise, Differential Signal Processing

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1994

Technical Support