AD6635

Obsolete

Four-Channel, 80 MSPS WCDMA Receive Signal Processor (RSP)

Data Sheet (Rev. 0) Product Selection Table

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Overview

80 MSPS Wide Band Inputs (14 linear
bit plus 3 RSSI)
Processes 4 WCDMA channels (UMTS or cdma2000 1x)
or 8 GSM/EDGE, IS136 Channels
Eight Independent Digital Receivers
in a Single Package
Four 16-Bit Parallel Output Ports and
Four 8-Bit Link Ports
Programmable Digital AGC Loops with
96d B Range
Digital Re-sampling for non-Integer
Decimation Rates

Programmable Decimating FIR Filters
Four Interpolating Half Band Filters
Programmable Attenuator Control for
Clip Prevention and External Gain
Ranging via Level Indicator
Flexible Control for Multi-Carrier
and Phased Array
3.3 Volt I/O, 2.5 Volt CMOS Core
User Configurable Built in Self Test
(BIST) Capability

The AD6635 is a multi-mode eight channel digital Receive Signal Processor (RSP) capable of processing up to four WCDMA channels. Each channel consists of four cascaded signal-processing elements: a frequency translator, two CIC decimating filters, and a programmable coefficient-decimating filter. Each input port has input level threshold detection circuitry and an AGC controller for accommodating large dynamic ranges or situations where gain ranging converters are used. Quad 16-bit parallel output ports accomodate high data rate WBCDMA applications. On-chip interpolating half band filters can also be used to further increase the output rate. In addition, each parallel output port has a digital AGC for output data scaling. Link port outputs are provided to enable glueless interfaces to Analog Devices’ TigerSHARC™ DSP core.

The AD6635 is part of Analog Devices’ SoftCell™ Multi-carrier transceiver chipset designed for compatibility with Analog Devices family of high sample rate IF sampling ADCs (AD6640/AD6644 12 & 14 bit). The SoftCell™ receiver comprises a digital receiver capable of digitizing an entire spectrum of carriers and digitally selecting the carrier of interest for tuning and channel selection. This architecture eliminates redundant radios in wireless base station applications.