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AD6633 Dataheets PDF



Part Number AD6633
Manufacturers Analog Devices
Logo Analog Devices
Description Multichannel Digital Upconverter
Datasheet AD6633 DatasheetAD6633 Datasheet (PDF)

Multichannel Digital Upconverter with VersaCREST™ Crest Reduction Engine AD6633 www.DataSheet4U.com FEATURES 4 or 6 wideband digital upconverter channels VersaCREST crest reduction engine reduces demands on external power amplifiers One 20-bit complex input port (I, Q interleaved), shared among 4 or 6 processing channels Two 18-bit output ports for parallel I and Q or a single 18-bit output port for interleaved I and Q All-pass phase equalizer filters (meets IS-95 requirements) Programmable RAM.

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Multichannel Digital Upconverter with VersaCREST™ Crest Reduction Engine AD6633 www.DataSheet4U.com FEATURES 4 or 6 wideband digital upconverter channels VersaCREST crest reduction engine reduces demands on external power amplifiers One 20-bit complex input port (I, Q interleaved), shared among 4 or 6 processing channels Two 18-bit output ports for parallel I and Q or a single 18-bit output port for interleaved I and Q All-pass phase equalizer filters (meets IS-95 requirements) Programmable RAM coefficient FIR filters (RCF) with resampling FIR interpolating filters, 2 per channel Fifth-order interpolating CIC filter, 1 per channel Full complex NCO, 32-bit tuning resolution (fine), worst spur better than −105 dBc, 1 per channel Complex FIR filter for frequency equalization or additional filtering Output automatic gain control Full complex composite NCO, 6-bit tuning resolution 16-bit/8-bit MicroPort (Intel® or Motorola® mode) Serial control port (SPI®- or SPORT-compatible) 3.3 V I/O and 1.8 V core supplies JTAG boundary scan User-configurable, built-in, self-test (BIST) capability GENERAL DESCRIPTION The AD6633 is a multichannel, wide bandwidth digital upconverter (DUC) with crest factor reduction (CFR) technology, which is available in 4-channel or 6-channel versions. It processes 20-bit baseband input data and generates 18-bit, wideband, real, or complex output data at up to 125 MSPS. This rate is suitable for driving digital-to-analog converters (DACs) at the first intermediate frequency (IF) directly. The AD6633 synthesizes multicarrier and multistandard digital signals to drive the DAC(s) with up to six wideband modulated carriers from a single output port. Each channel includes an internal peak-to-average power reduction block that reduces power amplifier (PA) power dissipation. The user-configurable interpolating filter (RCF) provides multirate processing (including resampling) and malleable FIR filter characteristics. An all-pass phase equalizer designed to comply with the cdma2000 standard follows the RCF. Each channel has its own 32-bit numerically-controlled oscillator (NCO) to up-convert the filtered/interpolated data to the first IF. Interpolation, antiimage filtering, all-pass equalization, and NCO tuning functions are combined in a single, cost-effective device. Digital IF signal processing provides repeatable manufacturing, higher accuracy, and more flexibility than comparable high dynamic range analog designs. The AD6633 uses a 3.3 V I/O power supply and a 1.8 V core power supply. Typical power consumption is 75 mW per channel or 1.4 W for the complete device. All I/O pins are 5 V tolerant. All control registers and coefficient values are programmed through a generic 16-bit microprocessor interface or a SPI/SPORT-compatible serial port. Intel and Motorola microprocessor bus modes are supported. All inputs and outputs are LVCMOS-compatible. For more information about the AD6633, contact Analog Devices via email at versaCOMM@analo.


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