GENERAL DESCRIPTION
The AD9144 is a quad, 16-bit, high dynamic range digital-to-analog converter (DAC) that provides a maximum sample rate of 2.8 GSPS, permitting a multicarrier generation up to the Nyquist frequency. The DAC outputs are optimized to interface seamlessly with the ADRF6720 analog quadrature modulator (AQM) from Analog Devices, Inc. An optional 3-wire or 4-wire serial port interface (SPI) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a typical range of 13.9 mA to 27.0 mA. The AD9144 is available in an 88-lead LFCSP.
FEATURES
Supports input data rate >1 GSPS
Proprietary low spurious and distortion design
6-carrier GSM IMD = 77 dBc at 75 MHz IF
SFDR = 82 dBc at dc IF, â9 dBFS
Flexible 8-lane JESD204B interface
Support quad or dual DAC mode at 2.8 GSPS
Multiple chip synchronization
Fixed latency
Data generator latency compensation
Selectable 1Ã, 2Ã, 4Ã, 8Ã interpolation filter
Low power architecture
Input signal power detection
Emergency stop for downstream analog circuitry protection
Transmit enable function allows extra power saving
High performance, low noise phase-locked loop (PLL) clock
multiplier
Digital inverse sinc filter
Low power: 1.6 W at 1.6 GSPS, 1.7 W at 2.0 GSPS,
full operating conditions
88-lead LFCSP with exposed pad
APPLICATIONS
Wireless communications
3G/4G W-CDMA base stations
Wideband repeaters
Software defined radios
Wideband communications
Point-to-point
Local multipoint distribution service (LMDS) and
multichannel multipoint distribution service (MMDS)
Transmit diversity, multiple input/multiple output (MIMO)
Instrumentation
Automated test equipment
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