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| MAX11950 20位1.6Msps全差分SAR ADC解決方案 |
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| 文章來源： 更新時間：2015/1/16 9:59:00 |
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Maxim公司的MAX11950是20位1.6Msps單路全差分SAR ADC,提供極好的靜態和動態性能以及功耗性能,SNR=98.3dB,THD=-123dB,保證20位分辨率而不丟失碼和6 LSB INL,器件具有SPI兼容的串口,主要用在測試測量,自動測量設備(ATE),醫療儀器,過程控制和工業自動化,數據采集系統,通信設備以及以電池為電源的設備.本文介紹了MAX11905主要優勢和特性,功能框圖, 單極和雙極單端輸入電路圖, MAX11905差分評估板主要特性, 系統框圖,電路圖和材料清單以及PCB元件布局圖.
The MAX11905 is a 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The MAX11905 provides excellent static and dynamic performance with best-in-class power consumption that directly scales with throughput. The device has a unipolar differential ±VREF input range. Supplies include a 3.3V supply for the reference buffers, a 1.8V analog supply, a 1.8V digital supply, and a 1.5V to 3.6V digital interface supply.
This ADC achieves 98.3dB SNR and -123dB THD, guarantees 20-bit resolution with no-missing codes and 6 LSB INL (max).
The MAX11905 communicates data using a SPI-compatible serial interface. The MAX11905 is offered in a 20-pin, 4mm x 4mm, TQFN package and is specified over the -40°C to +85°C operating temperature range.
MAX11905主要優勢和特性:
High DC/AC Accuracy Provides Better Measurement Quality 20-Bit Resolution with No Missing Codes
±6 LSB INL and ±1 LSB DNL Maximum at 16 Bits
98.3dB SNR and 98.1dB SINAD at fIN = 10kHz
-123dB THD at fIN = 10kHz
High Sampling Rate SAR Architecture Enables Fast Settling and Acquisition 1.6Msps Throughput with No Pipeline Delay
Integration Simplifies Design Integrated Reference Buffers, VREF = 2.5V to 3.6V
±VREF Unipolar Differential Analog Input Range
Scalable Ultra-Low Power Supply Reduces Power Consumption 9mW at 1.6Msps
Flexible Low-Voltage Supplies Save Cost 1.8V Analog and Digital Core Supply
1.5V to 3.6V Digital Interface Supply
3.3V REFVDD Reference Buffer Supply
Flexible, Industry-Standard Serial Interface and Small Package Reduce Size SPI-/QSPI™-/MICROWIRE®/DSP-Compatible
20-Pin, 4mm x 4mm, TQFN Package
MAX11905應用:
Test and Measurement
Automatic Test Equipment
Medical Instrumentation
Process Control and Industrial Automation
Data Acquisition Systems
Telecommunications
Battery-Powered Equipment
圖1. MAX11905功能框圖
圖2. MAX11905單極單端輸入電路圖
圖3. MAX11905雙極單端輸入電路圖
MAX11905差分評估板
The MAX11905 differential evaluation kit (EV kit) demonstrates the MAX11905, 20-bit, 1.6Msps, single-channel, fully differential SAR ADC with internal reference buffers. The EV kit uses the MAX44205, a low-noise fully differential operational amplifier. The EV kit includes a graphical user interface (GUI) that provides communication from Avnet’s ZedBoard™ development board for the Xilinx Zynq®-7000 SoC. The ZedBoard, not included with the EV kit, must be purchased through Avnet, Inc.
The ZedBoard communicates with the PC through an Ethernet cable using Windows XP®-, Windows Vista®-, Windows® 7-, or Windows 8/8.1-compatible software.
The EV kit comes with the MAX11905ETP+ installed.
MAX11905差分評估板主要特性:
Peripheral Module and FMC Connector for Interface
75MHz SPI Clock Capability through FMC Connector
37.5MHz SPI Clock Capability through Peripheral Module Connector
Sync In and Sync Out for Coherent Sampling
On-Board Input Buffer (MAX44205)
On-Board +3.0V Reference Voltage (MAX6126)
Windows XP-, Windows Vista-, Windows 7-, and Windows 8/8.1-Compatible Software
圖4. MAX11905差分評估板系統框圖
圖5. MAX11905差分評估板電路圖(1)
圖6. MAX11905差分評估板電路圖(2)
圖7. MAX11905差分評估板電路圖(3)
圖8. MAX11905差分評估板PCB元件布局圖(1)
圖9. MAX11905差分評估板PCB元件布局圖(2) |
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