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AD9640 Datenblatt(PDF) 4 Page - Analog Devices |
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AD9640 Datenblatt(HTML) 4 Page - Analog Devices |
4 / 41 page AD9640 Preliminary Technical Data Rev. PrD | Page 4 of 41 GENERAL DESCRIPTION The AD9640 is a dual 14-Bit 150 MSPS ADC. The AD9640 is designed to support communications applications where low cost, small size, and versatility are desired. The dual ADC core features a multistage differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth differential sample-and-hold analog input amplifiers supporting a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compen- sate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance. The AD9640 has several functions which simply the AGC function in the system receiver. The fast detect feature allows fast overrange detection by outputting 4 bits of input level information with very short latency. Additionally, the programmable threshold detector allows monitoring of the incoming signal power from the ADC’s 4 fast detect bits with very low latency. If the input signal level exceeds the programmable threshold, the decrement gain indicator will go high. Because this threshold is set from the 4 MSB’s this allows the user to quickly turn down the system gain to avoid an overrange condition. The second AGC related function is the Signal monitor. This block allows the user to monitor the composite magnitude of the incoming signal which aids in setting the gain to optimize the dynamic range of the overall system. The ADC output data can be routed directly to the two external 14-bit output ports. These outputs can be set from 1.8V to 3.3V CMOS. Or 1.8V LVDS. Flexible power-down options allow significant power savings, when desired. PRODUCT HIGHLIGHTS • Integrated dual 14-Bit 150 MSPS ADC. • Fast Over-range Detect and Signal monitor with Serial Output • Signal monitor block with dedicate serial output mode. • Proprietary, differential input maintains excellent SNR performance for input frequencies up to 450 MHz. • The AD9640 operates from a single 1.8 Volt supply and features a separate digital output driver supply to accommodate 1.8 V to 3.3 V logic families. • A standard serial port interface supports various product features and functions, such as data formatting (offset binary, twos complement, or gray coding), enabling the clock DCS, power-down, and voltage reference mode. • The AD9640 is pin compatible with the AD9627, allowing a simple migration from 12 to 14 Bits. |
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Ähnliche Beschreibung - AD9640 |
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