Signal Conditioning Operational Amplifiers (Op Amps) Differential Output Amplifiers
Signal Conditioning Filters Wideband Active Filters

LT6604-2.5 - Dual Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter

Features

  • Dual Differential Amplifier with 2.5MHz Lowpass Filters
       4th Order Filters
       Approximates Chebyshev Response
       Guaranteed Phase and Gain Matching
       Resistor-Programmable Differential Gain
  • >86dB Signal-to-Noise (3V Supply, 1VRMS Output)
  • Low Distortion (1MHz, 1VRMS Output, 800Ω Load)
       HD2: 92dBc
       HD3: 88dBc
  • Specified for Operation with 3V, 5V and ±5V Supplies
  • Fully Differential Inputs and Outputs
  • Adjustable Output Common Mode Voltage
  • Small 4mm × 7mm × 0.75mm QFN Package

Typical Application

LT6604-2.5 Typical Application
LT6604-2.5 Typical Application

Description

The LT6604-2.5 consists of two matched, fully differential amplifiers, each with a 4th order, 2.5MHz lowpass filter. The fixed frequency lowpass filter approximates a Chebyshev response. By integrating a filter and a differential amplifier, distortion and noise are made exceptionally low. At unity gain, the measured in-band signal-to-noise ratio is an impressive 86dB. At higher gains, the input referred noise decreases, allowing the part to process smaller input differential signals without significantly degrading the signal-to-noise ratio.

Gain and phase are well matched between the two channels. Gain for each channel is independently programmed using two external resistors. The LT6604-2.5 enables level shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. The LT6604-2.5 is fully specified for 3V operation. The differential design enables outstanding performance up to a 4VP-P signal level for a single 3V supply.

See the back page of this datasheet for a complete list of related single and dual differential amplifiers with integrated 2.5MHz to 20MHz lowpass filters.

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
LT6604CUFF-2.5#PBF 4x7 QFN-34 UFF C 05-08-1758 Yes
LT6604CUFF-2.5#TRPBF 4x7 QFN-34 UFF C 05-08-1758 Yes
LT6604IUFF-2.5#PBF 4x7 QFN-34 UFF I 05-08-1758 Yes
LT6604IUFF-2.5#TRPBF 4x7 QFN-34 UFF I 05-08-1758 Yes


LT6604-2.5 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
LT6604CUFF-2.5#PBF 4x7 QFN-34 C $9.30 $6.50 Yes
LT6604CUFF-2.5#TRPBF 4x7 QFN-34 C $6.56 Yes
LT6604IUFF-2.5#PBF 4x7 QFN-34 I $10.65 $7.45 Yes
LT6604IUFF-2.5#TRPBF 4x7 QFN-34 I $7.51 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
DC1418A-A LT6604-2.5 | Dual Matched 2.5MHz 4th Order LP Filter Demo Board $125.00
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Click here to view our complete list of demo boards

Applications

  • Dual Differential ADC Driver and Filter
  • Single-Ended to Differential Converter
  • Matched, Dual, Differential Gain or Filter Stage
  • Common Mode Translation of Differential Signals
  • High Speed ADC Antialiasing and DAC Smoothing in Wireless Infrastructure or Networking Applications
  • High Speed Test and Measurement Equipment
  • Medical Imaging

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
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  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
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