MAX2160 ISDB-T应用参考设计

2011-04-21 10:42:43来源: 互联网

Figure 1. The reference design for the MAX2160 tuner plus demodulator.



Figure 2. System block diagram.


Lab Measurements


Figure 3. Sensitivity measures better than -97dBm. The tradeoff in sensitivity is also shown when an optional WCDMA or cdma2000® rejection filter is added at the RF input.



Figure 4. A WCDMA blocker rejection filter response. To implement on-board coexistence of ISDB-T with a WCDMA system, additional input filtering is required to reject the cellular transmit-band frequencies. The optional reference-design filtering is a combination of two filters, which provide approximately 47dB of attenuation at the cellular transmit band (marker 4).



Figure 5. CDMA-2000 blocker rejection filter response. To implement on-board coexistence of ISDB-T with a cdma2000 system in a handheld application, additional input filtering is required to reject the cellular transmit-band frequencies. The optional reference-design filter provides approximately 42dB of attenuation at cdma2000 transmit frequencies (marker 4).


Additional Measurements

Parameter Conditions Target Measured Units
Maximum Input UHF: Ch. 13, Ch. 33, Ch. 52 0 8.9, 8.2, 7.3 dBm
Adjacent Channel Selectivity
(Desired: -70dBm)
UHF: Ch. 13, Ch. 33, Ch. 52 35 45, 47, 45 dBc
WCDMA Blocker Performance UHF: Ch. 13, Ch. 33, Ch. 52 24 23.5, 24, 24 dBm
cdma2000 Blocker Performance UHF: Ch. 13, Ch. 33, Ch. 52 10 21, 21, 21 dBm


ISDB-T Frequency Plan


Figure 6. The ISDB-T RF signal is broadcast in the UHF band, as shown above. The channel spacing is 6MHz.


Detailed Description

The MAX2160/MAX2160EGB tuner ICs are designed for use in Japanese mobile digital-TV (ISDB-T single-segment) applications. The devices directly convert UHF band signals to a low-IF by using a broadband I/Q downconverter. The operating frequency range extends from 470MHz to 770MHz.

The MAX2160/MAX2160EBG support both I/Q low-IF interfaces and single low-IF interfaces. The devices are thus universal tuners for various digital demodulator implementations.

The MAX2160/MAX2160EBG integrate LNA, RF and low-IF variable-gain amplifiers (VGAs), I and Q downconverting mixers, and bandpass filters providing in excess of 42dB of image rejection. The parts operate with either high-side or low-side local oscillator (LO) injection. The devices' VGAs provide in excess of 100dB of gain-control range.

The MAX2160/MAX2160EBG also have fully monolithic VCOs and tank circuits, and a complete frequency synthesizer. A XTAL oscillator and separate TCXO input buffer are also included. The devices operate with XTAL/TCXO oscillators from 13MHz to 26MHz, which enable the shared use of a VC-TCXO in cellular handset applications. Additionally, a divider is provided for the XTAL/TCXO oscillator, thus allowing for a simple and low-cost interface to various channel decoders.

cdma2000 is a registered trademark of Telecommunications Industry Association.

关键字:应用  参考  设计

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2011/0421/article_7391.html
本网站转载的所有的文章、图片、音频视频文件等资料的版权归版权所有人所有,本站采用的非本站原创文章及图片等内容无法一一联系确认版权者。如果本网所选内容的文章作者及编辑认为其作品不宜公开自由传播,或不应无偿使用,请及时通过电子邮件或电话通知我们,以迅速采取适当措施,避免给双方造成不必要的经济损失。
论坛活动 E手掌握
微信扫一扫加关注
论坛活动 E手掌握
芯片资讯 锐利解读
微信扫一扫加关注
芯片资讯 锐利解读
推荐阅读
全部
应用
参考
设计

小广播

独家专题更多

富士通铁电随机存储器FRAM主题展馆
富士通铁电随机存储器FRAM主题展馆
馆内包含了 纵览FRAM、独立FRAM存储器专区、FRAM内置LSI专区三大部分内容。 
走,跟Molex一起去看《中国电子消费品趋势》!
走,跟Molex一起去看《中国电子消费品趋势》!
 
带你走进LED王国——Microchip LED应用专题
带你走进LED王国——Microchip LED应用专题
 
电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2016 EEWORLD.com.cn, Inc. All rights reserved