AT48802 데이터 시트보기 (PDF) - Atmel Corporation

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AT48802

Spread-Spectrum Signal Processor Integrated Circuit

Atmel Corporation 

AT48802

Features

Two Independent PN (Pseudo-Random Noise) Generators

• Programmable R7 (128) to R13 (8,192) PN Sequence Lengths

• Programmable Tau-Dither Amplitude

• Programmable PN Phase Adjustment to 1/16 Chip

• Correlation Acquisition Interface

• Programming Register Control

• Microcontroller Compatible Bus Interface

• Patent-Pending Frequency Diversity

•• Low Speed Link Data Path for Supervisory and Setup Functions

Description

The AT48802 Spread-Spectrum Signal Processor (SSSP) chip from Atmel handles

all PN code generation, synchronization, and handshaking required for either station

(handset or base station) of a time division duplex direct sequence spread-spectrum

cordless telephone. The AT48802 supports RF spreading and despreading for the

best rejection of interference. In conjunction with a single-chip microcontroller, the

circuit performs the following functions:

• Generates a pseudo-random sequence for spreading the transmitted signal.

• Generates a pseudo-random sequence for despreading in the receiver.

• Generates a sliding phase PN for acquiring synchronization with an incoming

signal.

• Controls receive signal strength measurement timing for correlation peak

detection.

• Operates a tau-dither tracking loop, with adaptive threshold, to maintain

synchronization with the incoming signal.

• Controls transmit keying antenna switching for time-division duplexing.

Pin Configuration

(continued)

64 Lead PQFP

Spread-

Spectrum

Signal

Processor

Integrated

Circuit

Preliminary

0624A

2-1

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