TI ADS5485 16位ADC解决方案

TI公司的ADS5484 是16位200MSPS模数转换器(ADC),5.0V和3.3V,提供LVDS兼容的数据输出.ADS5484取样速率170/200MSPS,16位分辨率,噪音本底78dBFS, SFDR = 95dBc,可用于无线基础设备,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,通信仪表和雷达以及医疗成像等.本文介绍了ADS5484的主要特性, 方框图, 模拟输入等效电路,时钟输入电路以及评估板详细电路图.


The ADS5484/ADS5485 (ADS548x) is a 16-bit family of analog-to-digital converters (ADCs) that operate from both a 5-V supply and 3.3-V supply while providing LVDS-compatible digital outputs. The ADS548x integrated analog 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 provided to simplify the system design. Internal dither is available to improve SFDR. These devices are drop-in compatible to the ADS5483/5482/5481, creating a pin-compatible family from 80-200MSPS. Designed for highest total ENOB, the ADS548x family has outstanding low noise performance and spurious-free dynamic range.

The ADS548x is available in an QFN-64 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).

ADS5485主要特性:
170/200-MSPS Sample Rates
16-Bit Resolution, 78 dBFS Noise Floor
SFDR = 95 dBc
On-Chip High Impedance Analog Buffer
Efficient DDR LVDS-Compatible Outputs
Powerdown Mode: 70 mW
Pin-for-pin with ADS5483/5482/5481, 135/105/80MSPS ADCs
QFN-64 PowerPAD Package (9 mm × 9 mm footprint)
Industrial Temperature Range: –40°C to 85°C

ADS5485应用:
Wireless Infrastructure
Test and Measurement Instrumentation
Software-Defined Radio
Data Acquisition
Power Amplifier Linearization
Radar
Medical Imaging



图1. ADS5485方框图



图2.ADS5485模拟输入电路



图3. ADS5485时钟输入电路



图4.ADS5485 评估板(EVM)电路图(1)



图5.ADS5485 评估板(EVM)电路图(2)



图6.ADS5485 评估板(EVM)电路图(3)



图7.ADS5485 评估板(EVM)电路图(4)



图8.ADS5485 评估板(EVM)电路图(5)