AD7010

Features:

Single +5 V Supply
On-Chip p/4 DQPSK Modulator
Root-Raised-Cosine Tx Filters, a = 0.5
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
Very Low Power Dissipation, 30 mW typ
Power Down Mode < 5 mA
On-Chip Voltage Reference
24-Pin SSOP


Application

Japanese Digital Cellular Telephony


Pinout




Specifications

V_DD Tx, V_DD 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 V_DD to + 0.3 V
Analog I/O Voltage to AGND  . . . . . . .0.3 V to V_DD + 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


Description

The AD7010 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 Japanese Digital Cellular Telephone system. 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 AD7010 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 AD7010 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 power down options. The AD7010 is housed in a space efficient 24-pin SSOP (Shrink Small Outline Package).