Efficient, LDO-free Power Supply for a 12-bit 500-MSPS ADC Reference Design
PMP9767
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Description & Features

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Key Document

Description

The electrical performance of data converters depends on the cleanliness of their supply voltages. Linear regulators (LDOs) are commonly used but have low efficiency and high power loss, which is unsuitable for portable applications.

Using a switch mode power supply (SMPS) instead, such as the TPS62231 and TPS62237, is a cost-effective and efficient power supply solution. Such a solution does not degrade the performance of the 12-bit ADS540x family of analog to digital converters (ADCs) and does not waste excessive power. The test report shows the Signal to Noise Ratio (SNR) and Spurious-Free Dynamic Range (SFDR) comparisons between the two power supplies, which demonstrate the same performance.

Features

 

  • Efficiency increase from 47% to 83%
  • Input current reduced from 620 mA to 350 mA
  • No linear regulators (LDOs) required to cleanly power ADC
  • 12-bit performance maintained
  • Smaller DC/DC solution size than LDOs
  • Supports 5-V input

 


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Schematic/Block Diagram

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Test Data

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Design Files

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Parametrics
 PMP9767.1
(Output Voltage 1)
PMP9767.2
(Output Voltage 2)
Vin (Min) (V)44
Vin (Max) (V)66
Vout (Nom) (V)3.31.8
Iout (Max) (A).5.5
Output Power (W)1.65.9
Isolated/Non-IsolatedNon-IsolatedNon-Isolated
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (4)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS5407  Dual-Channel, 12-Bit, 500-MSPS Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
SN65LVDS100  2-Gbps LVDS, LVPECL & CML to LVDS buffer, repeater & translator  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS62230  2 MHz Ultra Small Step Down Converter with DCS-Control in 1x1.5 SON Package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS796  1-A, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS5407 Download
SN65LVDS100 Download Download
Download Download
TPS62230 Download Download
TPS796 Download
Download
Download Download

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Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 517 18 Dec 2015
Design files (3)
Title Type Size (KB) Date
ZIP 1238 18 Dec 2015
PDF 130 18 Dec 2015
PDF 90 18 Dec 2015
More literature (1)
Title Type Size (KB) Date
PDF 249 25 Jul 2017

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