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High-Speed Quad Digital-to-Analogue Converter Yields Higher Performance and Design Efficiency in Wireless Base Stations

27th April 2010

Analog Devices

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Datasheet

Analog Devices introduced a high-speed quad DAC (digital-to-analog converter) to provide support for multi-antenna wireless communications standards requiring the large bandwidths demanded by DPD (digital pre-distortion) transmit systems. The four-channel, 16-bit DAC has a 1-GSPS (giga-sample per second) data rate and cuts component count in half relative to dual-channel DACs.

Its 12 mm x 12 mm package size allows designers of WCDMA, CDMA2000, TD-SCDMA, GSM and WiMax infrastructure equipment and other wireless applications to reduce PCB (printed circuit board) space by 20 percent.

AD9148 Key Features and Benefits

· On-chip 32-bit NCO (numerically-controlled oscillator) for complex modulation schemes
· 2 times, 4 times, and 8 times interpolation
· Dual-port, time-interleaved LVDS (low-voltage differential signaling) interface with single port or byte-mode support enables high data rates
· 8-deep FIFO (first-in, first-out) memory eases timing layout
· Noise spectral density of -158dBm/Hz
· On-chip support for multi-DAC synchronization
· IMD (third-order intermodulation distortion) = 85dBc
· ACLR (adjacent-channel leakage ratio) = 78dBc
* Flip-chip package technology lowers package inductance and provides for superior AC performance

As part of a complete signal chain, the AD9148 quad DAC can interface to ADI’s ADL5371/2/3 frequency modulators, ADL5375 and ADRF670x analog quadrature modulators and AD9516 clock IC for clock distribution.