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AD9040AJR bảng dữ liệu(PDF) 8 Page - Analog Devices |
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AD9040AJR bảng dữ liệu(HTML) 8 Page - Analog Devices |
8 / 12 page AD9040A REV. B –8– Layout Information Preserving the accuracy and dynamic performance of the AD9040A requires that designers pay special attention to the layout of the printed circuit board. Analog paths should be kept as short as possible and be properly terminated to avoid reflections. The analog input and reference voltage connections should be kept away from digital signal paths; this reduces the amount of digital switching noise which is capacitively coupled into the analog section. Digital signal paths should also be kept short, and run lengths should be matched to avoid propagation delay mismatch. The AD9040A digital outputs should be buffered or latched close to the device (<2 cm). This prevents load transients which may feedback into the device. In high speed circuits, layout of the ground is critical. A single, low impedance ground plane on the component side of the board is recommended. Power supplies should be capacitively coupled to the ground plane with high quality chip capacitors to reduce noise in the circuit. Multilayer boards allow designers to lay out signal traces without interrupting the ground plane, and provide low impedance ground planes. In systems with dedi- cated analog and digital grounds, all grounds of the AD9040A should be connected to the analog ground plane. The power supplies of the AD9040A should be isolated from the supplies used for external devices; this reduces the amount of noise coupled into the ADC. The digital +5 volt connection of the device (VD, Pin 23) powers the digital outputs and should be connected to the same supply as +VS (Pins 3 and 10). Con- necting VD to a system digital supply may couple noise into the device. Sockets limit dynamic performance and are not recom- mended for use with the AD9040A. EVALUATION BOARD The evaluation board for the AD9040A (AD9040A/PCB) pro- vides an easy and flexible method for evaluating the ADC’s performance without (or prior to) developing a user-specific printed circuit board. The two-sided board includes a recon- struction DAC and digital output interface, and uses the layout and applications suggestions outlined above. It is available from Analog Devices at nominal cost. Generous space is provided near the analog input and digital outputs to support additional signal processing components the user may wish to add. This prototyping area includes through holes with 100-mil centers to support a variety of component additions. Input/Output/Supply Information Power supply, analog input, clock connections, and recon- structed output (RC OUTPUT) are identified by labels on the evaluation board. Operation of the evaluation board should conform to the following characteristics: Table I. Evaluation Board Characteristics Parameter Typical Units Supply Current +5 V 250 mA –5.2 V 300 mA AIN Impedance 51 Ω Voltage Range ±1.0 V CLOCK Impedance 51 Ω Frequency 40 MSPS RC OUTPUT Impedance 51 Ω Voltage Range 0 V to –1 V V Analog Input Analog input signals can be fed directly into the Device Under Test input (AIN). The AIN input is terminated at the device with a 51 Ω resistor. |
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Mô tả tương tự - AD9040AJR |
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