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
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