TI公司的ADS5263是采用CMOS工藝技術的具有低噪音16位前端和14位ADC的低功耗非常高SNR性能的集成電路,SNR可達85dBFS(10MHz),30MHz時可達80dBFS,最大取樣速率00 MSPS,可編程增益0 dB 到12 dB,主要用在醫(yī)療成像如MRI, 波譜學和CCD圖像.本文介紹了ADS5263主要特性,方框圖, 數字處理框圖以及ADS5263EVM評估板電路圖,材料清單和元件布局圖.
Using CMOS process technology and innovative circuit techniques, the ADS5263 is designed to operate at low power and give very high SNR performance with a 4-Vpp full-scale input. Using a low-noise 16-bit front-end stage followed by a 14-bit ADC, the device gives 85-dBFS SNR up to 10 MHz and better than 80-dBFS SNR up to 30 MHz.
The device also has a 14-bit low power mode, where it operates as a quad-channel 14-bit ADC. The 16-bit front-end stage is powered down and the part consumes almost half the power, compared to the 16-bit mode. The 14-bit mode supports a 2-Vpp full-scale input signal, with typical 74-dBFS SNR. The ADS5263 can be dynamically switched between the two resolution modes. This allows systems to use the same part in a high-resolution, high-power mode or a low-resolution, low-power mode.
ADS5263主要特性:
Maximum Sample Rate: 100 MSPS
Programmable Device Resolution
Quad-Channel, 16-Bit, High-SNR Mode
Quad-Channel, 14-Bit, Low-Power Mode
16-Bit High-SNR Mode
1.35 W Total Power at 100 MSPS338 mW/Channel
4 Vpp Full-scale Input
85-dBFS SNR at fin = 3 MHz, 100 MSPS
14-Bit Low-Power Mode
785 mW Total Power at 100 MSPS195 mW/Channel
2-Vpp Full-Scale Input
74-dBFS SNR at fin = 10 MHz
Integrated Clamp (for interfacing to CCD sensors)
Low-Frequency Noise Suppression
Digital Processing Block
Programmable FIR Decimation Filters
Programmable Digital Gain: 0 dB to 12 dB
2- or 4-Channel Averaging
Programmable Mapping Between ADC Input Channels and
LVDS Output Pins—Eases Board Design
Variety of Test Patterns to Verify Data Capture by FPGA/Receiver
ADS5263應用:
? Medical Imaging – MRI
? Spectroscopy
? CCD Imaging
圖1.ADS5263功能方框圖
圖2.ADS5263數字處理框圖
