TIDA-00077

Analog Interfacing Networks for DAC348x and Modulators

TIDA-00077

Design files

Overview

The analog interface circuits in this reference design are often used between current-source based digital-to analog converters (DAC) and quadrature modulators. While the DAC348x is used as an example of a TI high-speed DAC, the circuits can be applied to other current-source based converters with slight modifications. The DAC348x and TRF3705 analog interface are populated by default on the TSW308xEVMs. Both the DAC348x and TRF3705 are designed with the same DC bias and AC swing specification to provide a seamless interface. Other circuit topologies are described to account for other DC bias and AC swing specifications. By accounting the correct DC bias and proper AC swing, system designers can apply these circuits based on their application needs in order to achieve optimal performance.

Features
  1. A breakdown of the interface on the TSW308x is explained to show the direct connection between the DAC3484 and TRF3705
  2. General Design equations of current source DACs with IQ modulators are provided and explained
  3. TINA spice models are provided for different interface networks for DC, AC, and filtered interfaces to meet customer needs

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.

SLUA647A.PDF (735 K)

Reference design overview and verified performance test data

TIDR701.PDF (149 K)

Detailed schematic diagram for design layout and components

TIDR702.PDF (89 K)

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

TIDR703.ZIP (3329 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

High-speed DACs (>10MSPS)

DAC3482Dual-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)

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

DAC3484Quad-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)

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

DAC34H84Quad-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)

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

DAC34SH84Quad-Channel, 16-Bit, 1.5-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)

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

TRF37041750MHz to 6.0 GHz Quadrature Modulator, 1.7V common-mode voltage

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

TRF3705300MHz to 4GHz Quadrature Modulator

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

Technical documentation

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Type Title Date
Design guide Analog Interfacing Networks for DAC348x and Modulators (TIDA-00077) (Rev. A) Aug. 14, 2013

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