PMP9767

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

PMP9767

Design files

Overview

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

 

Output voltage options PMP9767.1 PMP9767.2
Vin (Min) (V) 4 4
Vin (Max) (V) 6 6
Vout (Nom) (V) 3.3 1.8
Iout (Max) (A) .5 .5
Output Power (W) 1.65 .9
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Buck- Synchronous

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBB0.PDF (578 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRJT9.PDF (90 K)

Detailed schematic diagram for design layout and components

TIDRJU0.PDF (130 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDCBO7.ZIP (1238 K)

Design file that contains information on physical board layer of design PCB

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS622302 MHz Ultra Small Step Down Converter with DCS-Control in 1x1.5 SON Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
High-speed ADCs (>10MSPS)

ADS5407Dual-Channel, 12-Bit, 500-MSPS Analog-to-Digital Converter (ADC)

Data sheet document-pdfAcrobat PDF
LVDS, M-LVDS & PECL ICs

SN65LVDS1002-Gbps LVDS, LVPECL & CML to LVDS buffer, repeater & translator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7961-A, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report PMP9767 Test Results Dec. 18, 2015
More literature Comparing Power-Supply Architectures for a 12-bit ADC Jul. 25, 2017

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