مدار مجتمع (آی سی) آی سی‌کاربرد ویژه

Product Attributes

Introduction

The AD7002 is a complete, low-power dual channel input/output port with signal conditioning. The device serves as a baseband digitization subsystem, performing signal conversion between the DSP and IF/RF sections in pan-European telephone systems (GSM).

The transmit path includes an on-board digital modulator containing all the code required to perform Gaussian Minimum Shift Keying (GMSK), along with two high-accuracy, fast DACs and output reconstruction filters. The receive path consists of two high-performance sigma-delta ADCs with digital filtering. A common bandgap reference powers both the ADCs and signal DACs.

Three control DACs (AUX DAC1 to AUX DAC3) are provided for functions such as AFC, AGC, and carrier signal shaping. In addition, AUX FLAG can be used to route digital control information to the IF/RF section through the device.

Since all GSM mobile systems require operation at the lowest possible power, the device provides power-down or sleep options for all sections (transmit, receive, and auxiliary).

The AD7002 is available in a 44-lead PQFP (Plastic Quad Flat Package).

Features

• Single +5V supply
• Transmit channel
• On-chip GMSK modulator
• Two 10-bit DACs
• Analog reconstruction filter
• Power-down mode
• Receive channel
• Two Sigma-Delta ADCs
• FIR digital filter
• On-chip offset calibration
• Power-down mode
• 3 auxiliary/analog converters
• Power-down mode
• On-chip voltage reference
• Low power consumption
• 44-pin PQFP package

Applications

• GSM
• PCN