DAC5674

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14-Bit, 400-MSPS, 2x-4x Interpolating Digital-to-Analog Converter (DAC)

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Product details

Parameters

Resolution (Bits) 14 Number of DAC channels (#) 1 Interface type Parallel CMOS Sample/update rate (MSPS) 400 Features High Performance Rating Catalog Interpolation 2x, 4x Power consumption (Typ) (mW) 435 SFDR (dB) 85 Architecture Current Source Operating temperature range (C) -40 to 85 Reference type Int open-in-new Find other High-speed DACs (>10MSPS)

Package | Pins | Size

HTQFP (PHP) 48 49 mm² 7 x 7 open-in-new Find other High-speed DACs (>10MSPS)

Features

  • 200-MSPS Maximum Input Data Rate
  • 400-MSPS Maximum Update Rate DAC
  • 76-dBc SFDR Over Full First Nyquist Zone With Single Tone Input Signal (Fout = 21 MHz)
  • 74-dBc ACPR W-CDMA at 15.36 MHz IF
  • 69-dBc ACPR W-CDMA at 30.72 MHz IF
  • Selectable 2x or 4x Interpolation Filter
    • Linear Phase
    • 0.05-dB Passband Ripple
    • 80-dB Stopband Attenuation
    • Stopband Transition 0.4-0.6 Fdata
    • Interpolation Filters Configurable in Either Low-Pass or High-Pass Mode, Allows For Selection Higher Order Image
  • On-chip 2x/4x PLL Clock Multiplier, PLL Bypass Mode
  • Differential Scalable Current Outputs: 2 mA to 20 mA
  • On-Chip 1.2-V Reference
  • 1.8-V Digital and 3.3-V Analog Supply Operation
  • 1.8/3.3-V CMOS Compatible Interface
  • Power Dissipation: 435 mW at 400 MSPS
  • Package: 48-Pin TQFP
  • APPLICATIONS
    • Cellular Base Transceiver Station Transmit Channel
      • CDMA: W-CDMA, CDMA2000, IS-95
      • TDMA: GSM, IS-136, EDGE/UWC-136
    • Test and Measurement: Arbitrary Waveform Generation
    • Direct Digital Synthesis (DDS)
    • Cable Modem Termination System

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CommsDAC and PowerPAD are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.

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Description

The DAC5674 is a 14-bit resolution high-speed digital-to-analog converter (DAC) with integrated 4x-interpolation filter, on-board clock multiplier, and on-chip voltage reference. The device has been designed for high-speed digital data transmission in wired and wireless communication systems, high-frequency direct-digital synthesis (DDS) and waveform reconstruction in test and measurement applications.

The 4x-interpolation filter is implemented as a cascade of two 2x-interpolation filters, each of which can be configured for either low-pass or high-pass response. This enables the user to select one of the higher order images present at multiples of the input data rate clock while maintaining a low date input rate. The resulting high IF output frequency allows the user to omit the conventional first mixer in heterodyne transmitter architectures and directly up-convert to RF using only one mixer, thereby reducing system complexity and costs.

In 4x-interpolation low-pass response mode, the DACs excellent spurious free dynamic range (SFDR) at intermediate frequencies located in the first Nyquist zone (up to 40 MHz) allows for multicarrier transmission in cellular base transceiver stations (BTS). The low-pass interpolation mode thereby relaxes image filter requirements by filtering out the images in the adjacent Nyquist zones.

The DAC5674 PLL clock multiplier controls all internal clocks for the digital filters and DAC core. The differential clock input and internal clock circuitry provides for optimum jitter performance. Sine wave clock input signal is supported. The PLL can be bypassed by an external clock running at the DAC core update rate. The clock divider of the PLL ensures that the digital filters operate at the correct clock frequencies.

The DAC5674 operates from an analog supply voltage of 3.3 V and a digital supply voltage of 1.8 V. The digital I/Os are 1.8-V and 3.3-V CMOS compatible. Power dissipation is 500 mW at maximum operating conditions. The DAC5674 provides a nominal full-scale differential current-output of 20 mA, supporting both single-ended and differential applications. The output current can be directly fed to the load with no additional external output buffer required. The device has been specifically designed for a differential transformer coupled output with a 50- doubly terminated load. For a 20-mA full-scale output current both a 4:1 impedance ratio (resulting in an output power of 4 dBm) and 1:1 impedance ratio transformer (–2-dBm output power) are supported. The latter configuration is preferred for optimum performance at high output frequencies and update rates.

An accurate on-chip 1.2-V temperature compensated bandgap reference and control amplifier allows the user to adjust the full-scale output current from 20 mA down to 2 mA. This provides 20-dB gain range control capabilities. Alternatively, an external reference voltage may be applied for maximum flexibility. The device features a SLEEP mode, which reduces the standby power to approximately 10 mW, thereby optimizing the power consumption for the system’s need.

The DAC5674 is available in a 48-pin HTQFP Powerpad™ plastic quad flatpack package. The device is characterized for operation over the industrial temperature range of –40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet 14-Bit 400 MSPS 2x/4x Interpolating CommsDAC DAC datasheet (Rev. A) Oct. 04, 2005
Technical article Keys to quick success using high-speed data converters Oct. 13, 2020
Application note Q4 2009 Issue Analog Applications Journal Sep. 24, 2018
Technical article Digital signal processing in RF sampling DACs – part 2 Apr. 04, 2017
Technical article Digital signal processing in RF sampling DACs - part 1 Feb. 13, 2017
Technical article Why phase noise matters in RF sampling converters Nov. 28, 2016
Application note Wideband Complementary Current Output DAC Single-Ended Interface (Rev. A) May 08, 2015
Application note Interfacing op amps to high-speed DACs, Part 2: Current-sourcing DACs Oct. 04, 2009
Application note Passive Terminations for Current Output DACs Nov. 10, 2008
Application note CDCE72010 as a Clocking Solution for High-Speed Analog-to-Digital Converters Jun. 08, 2008
Application note Phase Noise Performance and Jitter Cleaning Ability of CDCE72010 Jun. 02, 2008
User guide DAC5674EVM May 29, 2002

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description

DAC5674 is an evaluation module for DAC5674, a 400 MSPS digital to analog converter with 2x/4x interpolation. This evaluation module is designed to enable you to evaluate the device under various modes of operation.

Design tools & simulation

SIMULATION MODEL Download
SLWC061.ZIP (17 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOL Download

CAD/CAE symbols

Package Pins Download
HTQFP (PHP) 48 View options

Ordering & quality

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