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ADC12J1600 Datasheet(PDF) 31 Page - Texas Instruments |
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ADC12J1600 Datasheet(HTML) 31 Page - Texas Instruments |
31 / 98 page ![]() 90° Filter Filter Configurable 32-bit NCO and Mixer Configurable Decimation Filters 15 bit I 15 bit Q 12 bit Complex Baseband Output Oscillator ADC12J1600, ADC12J2700 www.ti.com SLAS969C – JANUARY 2014 – REVISED JULY 2015 Functional Block Diagram (continued) Figure 63. DDC Details Block Diagram 7.3 Feature Description 7.3.1 Signal Acquisition The analog input is sampled on the rising edge of CLK and the digital equivalent of that data is available in the serialized datastream t(LAT) or t(LAT_DDC) input clock cycles later. The ADC12J1600 and ADC12J2700 devices convert as long as the input clock signal is present. The fully- differential comparator design and the innovative design of the sample-and-hold amplifier, together with calibration, enables very good performance at input frequencies beyond 3 GHz. The ADC12J1600 and ADC12J2700 data is output on a high-speed serial JESD204B interface. 7.3.2 The Analog Inputs A differential input signal must be used to drive the ADC12J1600 and ADC12J2700 devices. Operation with a single-ended signal is not recommended as performance suffers. The input signals can be either be AC coupled or DC coupled. The analog inputs are internally connected to the VCMO bias voltage. When DC-coupled input signals are used, the common mode voltage of the applied signal must meet the device Input common mode requirements. See VCMI in the Recommended Operating Conditions table. The full-scale input range for each converter can be adjusted through the serial interface. See the Full Scale Range Adjust section. The buffered analog inputs simplify the task of driving these inputs and the RC pole that is generally used at sampling ADC inputs is not required. If an amplifier circuit before the ADC is desired, use care when selecting an amplifier with adequate noise and distortion performance and adequate gain at the frequencies used for the application. If gain is not required, a balun (balanced-to-unbalanced transformer) is generally used to provide single ended (SE) to differential conversion. The input impedance of VIN± consists of two 50- Ω resistors in series between the inputs and a capacitance from each of these inputs to ground. A resistance of approximately 20 k Ω exists from the center point of the 50-Ω resistors to the on-chip VCMO providing self-biasing for AC-coupled applications. Performance is good in both DC-coupled mode and AC coupled mode, provided the common-mode voltage at the analog input is within specifications. Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: ADC12J1600 ADC12J2700 |
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