MAX2557A 多频、多模RF至比特CDMA femto基

MAX2557A 多频、多模RF至比特CDMA femto基站无线接收器

The MAX2557A is a complete direct-conversion RF-to-bits receiver for cdma2000® 1x/EVDO femto basestations in Band Classes 0 and 1. The device has dedicated receive paths to enable monitoring forward link activities in both bands.

The unique RF-to-bits architecture of the MAX2557A integrates four LNAs with inputs/outputs internally matched to 50W, quadrature mixers, baseband anti-aliasing filters, programmable-gain RF and baseband amplifiers, fractional-N RF synthesizer, RF VCO, fractional-N frequency synthesizer for ADC sampling clock, and high-dynamic-range I/Q continuous-time sigma-delta ADCs. The sigma-delta modulators perform I and Q analog-to-digital conversion onto 1-bit digital streams. A programmable LVDS-like interface, with its own frac-N clock generation system, is used for the data transfer to the baseband/DSP, where the final decimation, equalization, and digital channel filtering are performed in compliance with the MAX-PHY digital section definition. Digital IP blocks are available from Maxim. The MAX2557A modes of operation are programmable by a 3-wire serial bus.

The MAX2557A is specified for operation in the extended -40°C to +85°C temperature range and is available in a 7mm x 7mm x 1.4mm fcLGA package with exposed pad (EP).

关键特性

Complete RF-to-Digital-Bits Radio Receiver Subsystem

Supports

• cdma2000 1x/EVDO Band Class 0 and 1 Reverse Link
• cdma2000 1x/EVDO Band Class 0 and 1 Forward Link Monitoring

TS25.104 Compliant

Compatible with UMTS1900, UMTS850, and CDMA Interference Environments

High-Dynamic-Range Continuous-Time Sigma-Delta ADCs Allow Simple AGC Implementation with Switched Gain States

MAX-PHY Digital Rx Interface with Single-Bit I/Q Bitstream, No Analog Signals

On-Chip Fractional-N Frequency Synthesizers for LO and Sampling Clock Generation

Dual-Buffered Reference Outputs to Drive Transmit IC and Baseband DSP

Programmable Rail-to-Rail GPO Pins Controlled by Serial Interface for External Component Control

Operation Controlled Entirely by 3-Wire Serial Interface, No Analog Control Signals Necessary

应用/使用

cdma2000 1x/EVDO femto基站

引脚配置/原理框图

接收器基站多模RF多频

免责声明：本网信息来自于互联网，目的在于传递更多信息，并不代表本网赞同其观点。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，并请自行核实相关内容。本站不承担此类作品侵权行为的直接责任及连带责任。如若本网有任何内容侵犯您的权益，请及时联系我们，本站将会在24小时内处理完毕。