High-speed quad DAC
11 May 2010
ADI’s 1-GSPS quad-channel DAC is an industry first at this speed and integration level.
Analog Devices, Inc. (ADI) has revealed the industry’s first high-speed quad DAC to provide support for multi-antenna wireless communications standards requiring the large bandwidths demanded by DPD (digital pre-distortion) transmit systems.
This four-channel, 16bit DAC has a 1-GSPS (giga-sample per second) data rate and cuts component count in half relative to dual-channel DACs. Its 12mm x 12mm package size allows designers of WCDMA, CDMA2000, TD-SCDMA, GSM and WiMax infrastructure equipment and other wireless applications to reduce PCB space by 20%.
The AD9148 features:
• On-chip 32bit NCO (numerically-controlled oscillator) for complex modulation schemes
• 2 times, 4 times, and 8 times interpolation
• Dual-port, time-interleaved LVDS (low-voltage differential signalling) 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 synchronisation
• IMD (third-order intermodulation distortion) = 85dBc
• ACLR (adjacent-channel leakage ratio) = 78dBc
As part of a complete signal chain, the AD9148 quad DAC can interface to ADI’s ADL5371/2/3 frequency modulators, ADL5375 and ADRF670x analogue quadrature modulators and AD9516 clock IC for clock distribution.
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