LT1993-2 - 800MHz Low Distortion, Low Noise Differential Amplifier ADC Driver (Av = 2V/V)

Features

  • 800MHz –3dB Bandwidth
  • Fixed Gain of 2V/V (6dB)
  • Low Distortion:
  • 38dBm OIP3, –70dBc HD3 (70MHz, 2VP-P)
  • 51dBm OIP3, –94dBc HD3 (10MHz, 2VP-P)
  • Low Noise: 12.3dB NF, en = 3.8nV/√Hz (70MHz)
  • Differential Inputs and Outputs
  • Additional Filtered Outputs
  • Adjustable Output Common Mode Voltage
  • DC- or AC-Coupled Operation
  • Minimal Support Circuitry Required
  • Small 0.75mm Tall 16-Lead 3 × 3 QFN Package

Typical Application

LT1993-2 Typical Application
LT1993-2 Typical Application

Description

The LT1993-2 is a low distortion, low noise Differential Amplifier/ADC driver for use in applications from DC to 800MHz. The LT1993-2 has been designed for ease of use, with minimal support circuitry required. Exceptionally low input-referred noise and low distortion products (with either single-ended or differential inputs) make the LT1993-2 an excellent solution for driving high speed 12- bit and 14-bit ADCs. In addition to the normal unfi ltered outputs (+OUT and –OUT), the LT1993-2 has a built-in 175MHz differential low pass fi lter and an additional pair of filtered outputs (+OUTFILTERED, –OUTFILTERED) to reduce external fi ltering components when driving high speed ADCs. The output common mode voltage is easily set via the VOCM pin, eliminating either an output transformer or AC-coupling capacitors in many applications.

The LT1993-2 is designed to meet the demanding requirements of communications transceiver applications. It can be used as a differential ADC driver, a general-purpose differential gain block, or in any other application requiring differential drive. The LT1993-2 can be used in data acquisition systems required to function at frequencies down to DC.

The LT1993-2 operates on a 5V supply and consumes 100mA. It comes in a compact 16-lead 3 × 3 QFN package and operates over a –40°C to 85°C temperature range.

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
LT1993CUD-2#PBF 3x3 QFN-16 UD C 05-08-1691 Yes
LT1993CUD-2#TRPBF 3x3 QFN-16 UD C 05-08-1691 Yes
LT1993IUD-2#PBF 3x3 QFN-16 UD I 05-08-1691 Yes
LT1993IUD-2#TRPBF 3x3 QFN-16 UD I 05-08-1691 Yes


LT1993-2 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
LT1993CUD-2#PBF 3x3 QFN-16 C $4.20 $2.95 Yes
LT1993CUD-2#TRPBF 3x3 QFN-16 C $3.01 Yes
LT1993IUD-2#PBF 3x3 QFN-16 I $4.65 $3.40 Yes
LT1993IUD-2#TRPBF 3x3 QFN-16 I $3.46 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
DC800A-A LT1993CUD-2 800MHz diff in/out ADC driver $50.00
DC900A-01E Combo Demoboard for LTC2249 and LT1993-2 (6dB) Req DC718 Contact Factory
DC900A-01U Combo Demoboard for LTC2254 and LT1993-2 (6dB) Req DC718 Contact Factory
DC900A-01V Combo Demoboard for LTC2255 and LT1993-2 (6dB) Req DC718 Contact Factory
Buy Now

Companion Boards

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

Applications

  • Differential ADC Driver for:
  • Imaging
  • Communications
  • Differential Driver/Receiver
  • Single Ended to Differential Conversion
  • Differential to Single Ended Conversion
  • Level Shifting
  • IF Sampling Receivers
  • SAW Filter Interfacing/Buffering

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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:
LT1993-10
LT1993-2
LT1993-4

Technical Support