DAC3484, DAC34H84 output power scaling

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Summary

The DAC3484 and DAC34H84 are Texas Instruments' new low-power, high-density, high-sampling, high-performance digital-to-analog converters that are now widely used in the communications industry. This article details the output interface of the DAC3484, DAC34H84 and quadrature modulators, and the calculation of the output power scaling.

Introduction to DAC3484 (DAC34H84)

The DAC3484 (DAC34H84) is Texas Instruments' new four-channel 16-bit analog-to-digital converter (DAC) with data rates up to 1.25 GSPS (gigasamples per second). With a package size of 9mm x 9mm, this highly integrated new converter uses half the number of devices compared to dual-channel DACs, enabling designers of TDSCDMA, WCDMA, CDMA2000, GSM and WiMAX infrastructure equipment and other wireless applications. PCB footprint is reduced by 43%. Its ultra-low power consumption (1.2W) greatly simplifies the thermal design of the system and is the industry's lowest power 4-channel 1.25G sampling DAC. At the same time it supports the large bandwidth multi-antenna wireless communication standard required by DPD (Digital Pre-Distortion) transmission systems.

Key Features and Benefits of the DAC3484 (DAC34H84)

On-chip 32-bit NCO (Numerical Control Oscillator) for on-chip Coarse Mixer modulation in complex modulation schemes for simple modulation schemes
2x, 4x, 8x, and 16x times interpolated time interleaved LVDS (low voltage differential signaling) interface for higher data rates
8-bit deep FIFO (first in, first out) memory, greatly reducing the need for data clock and data clock synchronization
Noise spectral density of -160dBm/Hz On-chip support for multi-DAC synchronization Optimized PLL function The unique Group Delay adjustment function supports the input of ultra-wideband baseband data and is more suitable for the emission stage of ultra-wideband DPD.

As part of the complete signal chain, the DAC3484 (DAC34H84) quad DAC can be connected to TI's TRF3703/TRF3704 frequency modulator for the CDCE62005 clock IC for clock distribution and the power amplifier predistortion (DPD) chip GC5330, GC5337, and more.

AC/DC interface circuit for DAC3484 (DAC34H84) and TRF3703

The above is part of the content, see the PDF Chinese document for details!