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AD7011

Analog Devices
Part Number AD7011
Manufacturer Analog Devices
Description CMOS/ ADC p/4 DQPSK Baseband Transmit Port
Published Mar 23, 2005
Detailed Description a FEATURES Single +5 V Supply On-Chip ␲/4 DQPSK Modulator Modulator Bypass Analog Mode Root-Raised Cosine Tx Filters, ␣ ...
Datasheet PDF File AD7011 PDF File

AD7011
AD7011

Overview
a FEATURES Single +5 V Supply On-Chip ␲/4 DQPSK Modulator Modulator Bypass Analog Mode Root-Raised Cosine Tx Filters, ␣ = 0.
35 Two 10-Bit D/A Converters 4th Order Reconstruction Filters Differential Analog Outputs On-Chip Ramp Up/Down Power Control On-Chip Tx Offset Calibration Dual Mode Operation, Analog and Digital Very Low Power Dissipation, 30 mW typical Power Down Mode < 10 ␮ A On-Chip Voltage Reference 24-Pin SSOP APPLICATIONS American Digital Cellular Telephony American Analog Cellular Telephony CMOS, ADC ␲/4 DQPSK Baseband Transmit Port AD7011 GENERAL DESCRIPTION The AD7011 is a complete low power, CMOS, π/4 DQPSK modulator with single +5 V power supply.
The part is designed to perform the baseband conversion of I and Q transmit waveforms in accordance with the American Digital Cellular Telephone system (TIA IS-54).
The on-chip π/4 Differential Quadrature Phase Shift Keying (DQPSK) digital modulator, which includes the root raised cosine filters, generates I and Q data in response to the transmit data stream.
The AD7011 also contains ramp control envelope logic to shape the I and Q output waveforms when ramping up or down at the beginning or end of a transmit burst.
Besides providing all the necessary logic to perform π/4 DQPSK modulation, the part also provides reconstruction filters to smooth the DAC outputs, providing continuous time analog outputs.
The AD7011 generates differential analog outputs for both the I and Q signals.
As it is a necessity for all digital mobile systems to use the lowest possible power, the device has transmit and receive power-down options.
The AD7011 is housed in a space efficient 24-pin SSOP (Shrink Small Outline Package).
FUNCTIONAL BLOCK DIAGRAM DGND MCLK I BIN (Q DATA) ANALOG MODE SERIAL Q INTERFACE MODULATOR BYPASS I Tx DATA (I DATA) Tx CLK (FRAME) π /4 DQPSK DIGITAL MODULATOR 10-BIT Q-DAC 10-BIT I-DAC RECONSTRUCTION FILTERS ITx ITx VDD VAA AGND CALIBRATION CIRCUITRY Q RECONSTRUCTION FILTERS QTx QTx READY AD7011 PO...


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