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AD9773 Datasheet(PDF) 2 Page - Analog Devices |
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AD9773 Datasheet(HTML) 2 Page - Analog Devices |
2 / 19 page AD9773 2 PRELIMINARY TECHNICAL DATA PRODUCT DESCRIPTION (Continued) The selectable 2 ×/4×/8× interpolation filters simplify the requirements of the reconstruction filters while simulta- neously enhancing the TxDAC+ family’s passband noise/ distortion performance. The independent channel gain and offset registers allow the user to calibrate LO feedthrough and sideband suppression errors associated with analog quadrature modulators. The 6 dB of gain adjustment range also can be used to control the output power level of each DAC. The AD9773 features the ability to perform Fs/4 and Fs/8 digital modulation and image rejection when combined with an analog quadrature modulator. In this mode, the AD9773 would accept I and Q complex data (representing a single or multicarrier waveform), generate a quadrature modulated IF signal along with its orthogonal representa- tion via its dual DACs, and present these two recon- structed orthogonal IF carriers to an analog quadrature modulator to complete the image rejection upconversion process. Another digital modulation mode (i.e. the Direct IF Mode) allows the original baseband signal representa- tion to be frequency translated such that pairs of images fall at multiples of 1/2 the DAC update rate. The AD9773 family includes a flexible clock interface accepting differential or single-ended sinewave or digital logic inputs. An internal PLL clock multiplier is also included to generate the necessary on-chip high frequency clocks. It can also be disabled to allow the use of a higher performance external clock source. An internal program- mable divider simplifies clock generation in the converter when using an external clock source. A flexible data input interface allows for straight binary or 2’s complement formats as well as supports single port interleaved or dual port data. Dual high performance TxDAC+s provides a differential current output programmable over a 0-20mA range. The AD9773 is manufactured on an advanced 0.35 micron CMOS process, operates from a single supply of 3.0V to 3.6 V and consumes <700 mW of power. Targeted at wide dynamic range, Multi-Carrier and Multi- Standard systems, the superb baseband performance of the AD9773 is ideal for Wideband-CDMA, Multi-Carrier CDMA, Multi-Carrier TDMA, Multi-Carrier GSM and high performance systems employing high order QAM modula- tion schemes. The image rejection feature simplifies and can help to reduce the number of signal band filters needed in an transmit signal chain. The direct IF mode helps to eliminate a costly mixer stage for a variety of communica- tions systems. PRODUCT HIGHLIGHTS 1. The AD9773 is the 12 bit member of the AD977x family of pin-compatible, high performance, programmable 2 ×/4×/8× interpolating TxDAC+s. 2. Direct IF Transmission capability for 70MHz +IFs through a novel digital mixing process 3. Fs/8 Digital Quadrature Modulation and user selectable image rejection to simplify /remove cascaded SAW filter stages 4. 2 ×/4×/8× User Selectable Interpolating Filter eases data rate and output signal reconstruction filter requirements. 5. User selectable 2’s Complement/Straight Binary Data Coding. 6. User programmable Channel Gain Control over 1 dB range in 0.01dB increments 7. User programmable Channel Offset +/-10% over the FSR 8. Ultra high speed 400 MSPS DAC conversion rate. 9. Internal Clock Divider provides data rate clock for easy interfacing. 10. Flexible Clock Input with Single Ended or Differential Input, CMOS or 1V p-p LO Sinewave input capability. 11. Low Power: Complete CMOS DAC operates on <700 mW from a 3.0V to 3.6V single supply. The 20ma full-scale current can be reduced for lower power operation, and a several sleep functions are provided to reduce power during idle periods. 12. On-chip Voltage Reference: The AD9773 includes a 1.20 V temperature-compensated bandgap voltage reference. 13. Small 80 lead LQFP REV. PrA |
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