The AD7011 is a complete low power, CMOS, /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 Tele- phone system (TIA IS-54). The on-chip /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 /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).
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American Digital Cellular TelephonyAmerican Analog Cellular Telephony
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Single +5 V SupplyOn-Chip p/4 DQPSK ModulatorModulator Bypass Analog ModeRoot-Raised Cosine Tx Filters, a = 0.35Two 10-Bit D/A Converters4th Order Reconstruction FiltersDifferential Analog OutputsOn-Chip Ramp Up/Down Power ControlOn-Chip Tx Offset CalibrationDual Mode Operation, Analog and DigitalVery Low Power Dissipation, 30 mW typicalPower Down Mode < 10 mAOn-Chip Voltage Reference24-Pin SSOP
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VDD Tx, VDD Rx to AGND . . . . . . . . . . . . . . .0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . 0.3 V to +0.3 V
Digital I/O Voltage to DGND . . . . . . .0.3 V to VDD + 0.3 V
Analog I/O Voltage to AGND . . . . . . 0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . .65°C to + 150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C
SSOP JA Thermal Impedance . . . . . . . . . . . . . .+122°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Post a Buying Lead
Required Field 
