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| NS ADC083000 3GSPS ADC应用方案 | |||||
作者：NS 文章来源：本站原创 点击数： 更新时间：2007-9-28  |
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ADC083000 8-Bit, 3 GSPS, High Performance, Low Power A/D Converter 概述： The ADC083000 is a single, low power, high performance CMOS analog-to-digital converter that digitizes signals to 8 bits resolution at sampling rates up to 3.4 GSPS. Consuming a typical 1.9 Watts at 3 GSPS from a single 1.9 Volt supply, this device is guaranteed to have no missing codes over the full operating temperature range. The unique folding and interpolating architecture, the fully differential comparator design, the innovative design of the internal sample-and-hold amplifier and the self-calibration scheme enable a very flat response of all dynamic parameters up to Nyquist, producing a high 7.0 Effective Number Of Bits, (ENOB) with a 748 MHz input signal and a 3 GHz sample rate while providing a 10-18 Bit Error Rate, (BER). The ADC083000 achieves a 3 GSPS sampling rate by utilizing both the rising and falling edge of a 1.5 GHz input clock. Output formatting is offset binary and the LVDS digital outputs are compatible with IEEE 1596.3-1996, with the exception of an adjustable common mode voltage between 0.8V and 1.15V. The ADC has a 1:4 demultiplexer that feeds four LVDS buses and reduces the output data rate on each bus to a quarter of the sampling rate. The converter typically consumes less than 25 mW in the Power Down Mode and is available in a 128-lead, thermally enhanced exposed pad LQFP and operates over the Industrial (-40°C ≤ TA ≤ +85°C) temperature range. 主要特性： ■ Internal Sample-and-Hold ■ Single +1.9V ±0.1V Operation ■ Choice of SDR or DDR output clocking ■ Guaranteed No Missing Codes ■ Serial Interface for Extended Control ■ Adjustment of Input Full-Scale Range and Offset ■ Duty Cycle Corrected Sample Clock ■ Test pattern 主要指标： ■ Resolution 8 Bits ■ Max Conversion Rate 3 GSPS (min) ■ Bit Error Rate (BER) 10-18 (typ) ■ ENOB @ 748 MHz Input 7.0 Bits (typ) ■ SNR @ 748 MHz 44.5 dB (typ) ■ Full Power Bandwidth 3 GHz (typ) ■ Power Consumption — Operating 1.9 W (typ) — Power Down Mode 25 mW (typ) 应用： ■ Direct RF Down Conversion ■ Digital Oscilloscopes ■ Satellite Set-top boxes ■ Communications Systems ■ Test Instrumentation ADC083000方框图：  详情请见数据表： http://www.national.com/ds/DC/ADC083000.pdf 下图是ADC083000评估板外形图：  以下是评估板的电路图：  图1。评估板电路图（1）  图2。评估板电路图（2）  图3。评估板电路图（3）  图4。评估板电路图（4）  图5。评估板电路图（5）  图6。评估板电路图（6）  图7。评估板电路图（7） 评估板的详情请见： >http://www.national.com/appinfo/adc/files/ADC08(B)3000RB_Schematic.pdf |
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