Analog Interfacing Networks for DAC348x and Modulators
TIDA-00077
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Description & Features

Technical documentation

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Description

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

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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC3482  Dual-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
DAC3484  Quad-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
DAC34H84  Quad-Channel, 16-Bit, 1.25-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
DAC34SH84  Quad-Channel, 16-Bit, 1.5-GSPS, 1x-16x Interpolating Digital-to-Analog Converter (DAC)  Digital-to-analog converters (DACs)  Sample & Buy View Design Kits & Evaluation Modules
TRF370417  50MHz to 6.0 GHz Quadrature Modulator, 1.7V common-mode voltage  Mixers & modulators  Sample & Buy View Design Kits & Evaluation Modules
TRF3705  300MHz to 4GHz Quadrature Modulator  Mixers & modulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DAC3482 Download -
Download Download
DAC3484 Download -
Download
DAC34H84 Download -
TRF370417 Download Download
TRF3705 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 735 14 Aug 2013
Design files (3)
Title Type Size (KB) Date
ZIP 3329 03 Jun 2014
PDF 89 03 Jun 2014
PDF 149 03 Jun 2014

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