Quad-Channel 250-Msps Digitizer with Variable Gain Amplifier Reference Design

(ACTIVE) TIDA-00094

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Description

This reference design shows a quad channel, 14-bit, 250-Msps digitizer with wide input range using the LMH6881 programmable differential amplifier and ADS4449 quad-channel, 14-bit, 250-Msps ADC. This combination allows an input voltage range of approximately 1 Vpp to 100 uVpp (4 dBm to -75 dBm) while maintaining a minimum SNR of 6 dB. Performance versus input frequency is shown for both AC and DC coupled applications. Various options for common-mode voltages, power supplies, and interfaces are discussed and measured to meet the requirements of a variety of applications. Anti-aliasing filter examples are shown along with the performance improvements that they provide.

Features
  • Gain range of 6-dB to 26-dB allows wide input voltage range of 100 uVpp to 1 Vpp
  • Allows single-ended or differential input source
  • SFDR > 77 dBFs, SNR > 71 dBFS
  • Examples of both AC and DC coupled interfaces
  • Demonstrates anti-aliasing filter design and performance gains
  • Common mode voltage considerations for best performance are discussed

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Bill of Materials (BOM)

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS4449  Quad-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LMH6881  2.4GHz Programmable Differential Amplifier with Gain Control  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMH6882  2.4 GHz Dual Programmable Differential Amplifier with Gain Control  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS2400  Overvoltage/Undervoltage Protection IC in SOT-23-5  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS62420  Dual, Adjustable, 600mA and 1000mA, 2.25MHz Step-Down Converter with 1-Wire Interface in QFN   Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A80  Low-Noise, High-Bandwidth PSRR, 1A Low-Dropout (LDO) Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMH6881 Download Download
LMH6882 WQFN (NJK)| 36 Download
TPS2400 Download Download
TPS62420 Download Download
TPS7A80 Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 542 30 Mar 2014 0
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 305 07 Apr 2015 0
PDF 179 07 Apr 2015 0
Related Tools & Software

Software (2)



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