Scalable 20.8 GSPS reference design for 12 bit digitizers
TIDA-010128
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Key Document

Description

This reference design describes a 20.8 GSPS sampling system using RF sampling analog-to-digital converters (ADCs) in time interleaved configuration. Time interleaving method is a proven and traditional way of increasing sample rate, however, matching individual ADCs offset, gain and sampling time mismatch is critical to achieve performance. The complexity of interleaving increases with higher sampling clock. The phase matching between the ADCs is one of the critical specifications to achieve better SFDR and ENOB. This reference design uses the noiseless aperture delay adjustment feature on ADC12DJ5200RF with a 19 fs precise phase control steps that eases 20.8 GSPS interleaving implementation. The reference design uses on-board low noise JESD204B clock generator based on LMK04828 and LMX2594 that meets 12 bit system performance requirement.

Features
  • 20.8 GSPS Time interleaved 12-bit RF-sampling ADCs
  • 6 GHz Analog front end
  • Fine sample clock phase adjustment (19 fs resolution)
  • Phase synchronization of multiple ADCs
  • Companion power reference design with a >85% efficiency at 12-V input
  • JESD204B supporting 8, 16, or 32 JESD lanes, data rates up to 12.8 Gbps per lane

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TI Devices (23)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADC12DJ5200RF  RF-sampling 12-bit ADC with dual-channel 5.2 GSPS or single-channel 10.4 GSPS  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
CSD15571Q2  20V, N ch NexFET MOSFET™, single SON2x2, 19.2mOhm  MOSFETs  Sample & Buy Not Available
DS90LT012AQ-Q1  Automotive LVDS Differential Line Receiver  Interface  Sample & Buy View Design Kits & Evaluation Modules
DS90LV028AQ-Q1  Automotive LVDS dual differential line receiver  Interface  Sample & Buy View Design Kits & Evaluation Modules
LM95233  ±2°C Dual Remote and Local Temperature Sensor with TruTherm Technology and SMBus Interface  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LMC6762  Dual Micro-Power Rail-to-Rail Input CMOS Comparator with Push-Pull Output  Amplifiers  Sample & Buy Not Available
LMH5401  8-GHz Ultra wideband fully differential amplifier  RF amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMH6401  4.5 GHz ultra wideband digital variable gain amplifier  RF amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMK00304  3.1-GHz Differential Clock Buffer/Level Translator  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
LMK04828  Ultra-low jitter synthesizer & jitter cleaner  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
LMK61E2  Ultra-Low Jitter Fully Programmable Oscillator, Integrated EEPROM, +/-50ppm  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
LMX2594  15 GHz Wideband PLLatinum™ RF Synthesizer with Phase Synchronization and JESD204B support  RF & microwave  Sample & Buy View Design Kits & Evaluation Modules
SN74AVC4T774  4-bit dual-supply bus transceiver with configurable voltage-level shifting and 3-state outputs  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G08  Single 2-Input Positive-AND Gate  Gate  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G125  Single Bus Buffer Gate With 3-State Outputs  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC2G53  5-V, 2:1 (SPDT), 1-channel general-purpose analog switch (available in the NanoFree™ package)  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules
TCA9534A  Remote 8-Bit I2C and Low-Power I/O Expander With Interrupt Output and Configuration Registers  I2C ICs  Sample & Buy View Design Kits & Evaluation Modules
TLV702  300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS25926  4.5-V to 13.8-V, 30mΩ, 2-5A eFuse  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS7A33  1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A8300  2-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A84  3-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS82130  3-A 17V Step-down Converter Module with Integrated Inductor  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD15571Q2 WSON (DQK)| 6 Download
DS90LT012AQ-Q1 Download Download
DS90LV028AQ-Q1 Download Download
Download -
LM95233 Download Download
LMC6762 Download Download
LMH5401 Download Download
LMK00304 Download Download
LMK04828 Download Download
LMK61E2 Download Download
LMX2594 Download Download
SN74AVC4T774 Download Download
Download Download
Download Download
SN74LVC1G08 Download Download
Download Download
Download
Download Download
Download -
Download Download
Download Download
SN74LVC1G125 Download Download
Download Download
Download
Download Download
Download -
Download Download
Download Download
SN74LVC2G53 Download Download
Download Download
Download -
TCA9534A Download
Download
TLV702 Download Download
Download Download
TPS25926 Download
TPS7A33 Download Download
Download Download
TPS7A8300 Download
Download -
TPS7A84 Download Download
TPS82130 uSiP (SIL)| 8 Download Download

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Technical documentation

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Datasheet (1)
Title Type Size (KB) Date
PDF 2042 12 May 2020
Application notes (1)
Title Type Size (KB) Date
PDF 140 28 Nov 2001
User guides (2)
Title Type Size (KB) Date
PDF 11698 22 May 2019
PDF 6295 05 Mar 2019
White papers (1)
Title Type Size (KB) Date
PDF 587 01 Feb 2005
Design files (6)
Title Type Size (KB) Date
PDF 240 22 May 2019
ZIP 13521 22 May 2019
ZIP 37212 22 May 2019
PDF 28701 22 May 2019
PDF 2981 22 May 2019
PDF 3344 22 May 2019
Related Tools & Software

Reference Designs (1)

Hardware development (2)


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