AD7002

Features:

Single +5 V Supply
Transmit Channel
On-Chip GMSK Modulator
Two 10-Bit D/A Converters
Analog Reconstruction Filters
Power-Down Mode
Receive Channel
Two Sigma-Delta A/D Converters
FIR Digital Filters
On-Chip Offset Calibration
Power-Down Mode
3 Auxiliary D/A Converters
Power-Down Modes
On-Chip Voltage Reference
Low Power
44-Lead PQFP


Application

GSM
PCN


Pinout




Specifications

DV_DD to AGND  . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AV_DD to AGND  . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AGND to DGND  . . . . . . . . . . . . . . . . . . . .    0.3 V to +0.3 V
Digital Input Voltage to DGND  . . . .  0.3 V to DV_DD + 0.3 V
Analog Input Voltage to AGND  . . . . 0.3 V to AV_DD + 0.3 V
Input Current to Any Pin Except Supplies². . . . . . . .±10 mA
Operating Temperature Range
Industrial Plastic (A Version)  . . . . . . . . . . .40°C to +85°C
Storage Temperature Range  . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 secs)  . . . . . . . .  +300°C
Power Dissipation (Any Package) to +75°C  . . . . . 450 mW
Derates Above +75°C by  . . . . . . . . . . . . . . . . . .10 mW/°C


Description

The AD7002 is a complete low power, two-channel, input/ output port with signal conditioning. The device is used as a baseband digitization subsystem, performing signal conversion between the DSP and the IF/RF sections in the Pan-European telephone system (GSM). The transmit path consists of an onboard digital modulator, containing all the code necessary for performing Gaussian Minimum Shift Keying (GMSK), two high accuracy, fast DACs with output reconstruction filters. The receive path is composed of two high performance sigma-delta ADCs with digital filtering. A common bandgap reference feeds the ADCs and signal DACs.

Three control DACs (AUX DAC1 to AUX DAC3) are included for such functions as AFC, AGC and carrier signal shaping. In addition, AUX FLAG may be used for routing digital control information through the device to the IF/RF sections. As it is a necessity for all GSM mobile systems to use the lowest power possible, the device has power-down or sleep options for all sections (transmit, receive and auxiliary). The AD7002 is housed in 44-lead PQFP (Plastic Quad Flatpack).