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| TI ADS5474 400MSPS ADC方案 |
| 作者： 时间：2008-09-28 来源: eaw |
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TI公司的ADS5474 是14位400MSPS模数转换器( ADC),5.0V和3.3V,提供LVDS兼容的数据输出.转换器的输入带宽1.4GHz,400MSPS时的输入频率超过400MHz.可用于测试和测量仪表,软件定义无线电,数据采集,功率放大器线性化,通信仪表和雷达等.本文介绍了ADS5474的主要特性, 方框图, 模拟输入等效电路, ADS5474和放大器THS4509应用电路图以及时钟输入电路以及评估板详细电路图和所用材料清单(BOM).
The ADS5474 is a 14-bit, 400-MSPS analog-to-digital converter (ADC) that operates from both a 5-V supply and 3.3-V supply while providing LVDS-compatible digital outputs. This ADC is one of a family of 12-, 13-, and 14-bit ADCs that operate from 210 MSPS to 500 MSPS. The ADS5474 input buffer isolates the internal switching of the onboard track and hold (T&H) from disturbing the signal source while providing a high-impedance input. An internal reference generator is also provided to simplify the system design.
Designed with a 1.4-GHz input bandwidth for the conversion of wide-bandwidth signals that exceed 400 MHz of input frequency at 400 MSPS, the ADS5474 has outstanding low-noise performance and spurious-free dynamic range over a large input frequency range.
The ADS5474 is available in an TQFP-80 PowerPAD package. The device is built on Texas Instruments complementary bipolar process (BiCom3) and is specified over the full industrial temperature range (-40°C to +85°C).
ADS5474主要特性:
400-MSPS Sample Rate
14-Bit Resolution, 11.2-Bits ENOB
1.4-GHz Input Bandwidth
SFDR = 80 dBc at 230 MHz and 400 MSPS
SNR = 69.8 dBFS at 230 MHz and 400 MSPS
2.2-VPP Differential Input Voltage
LVDS-Compatible Outputs
Total Power Dissipation: 2.5 W
Power Down Mode: 50 mW
Offset Binary Output Format
Output Data Transitions on the Rising and Falling Edges of a Half-Rate Output Clock
On-Chip Analog Buffer, Track-and-Hold, and Reference Circuit
TQFP-80 PowerPAD Package (14 mm × 14 mm footprint)
Industrial Temperature Range:-40°C to +85°C
Pin-Similar/Compatible with 12-, 13-, and 14-Bit Family:
ADS5463 and ADS5440/ADS5444
主要应用:
Test and Measurement Instrumentation
Software-Defined Radio
Data Acquisition
Power Amplifier Linearization
Communication Instrumentation
Radar
图1. ADS5474方框图
图2. ADS5474模拟输入等效电路
图3.ADS5474和放大器THS4509应用电路图
图4.时钟输入电路
图5.前端电路图
图6.FPGA I/O电路图
图7.USB和逻辑分析连接电路图
图8.FPGA系统电路图
图9.电源电路图
评估板材料清单(BOM):
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