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AD9228 Datasheet(PDF) 35 Page - Analog Devices |
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AD9228 Datasheet(HTML) 35 Page - Analog Devices |
35 / 52 page AD9228 Rev. 0 | Page 35 of 52 EVALUATION BOARD The AD9228 evaluation board provides all of the support cir- cuitry required to operate the ADC in its various modes and configurations. The converter can be driven differentially through a transformer (default) or through the AD8332 driver. The ADC can also be driven in a single-ended fashion. Separate power pins are provided to isolate the DUT from the AD8332 drive circuitry. Each input configuration can be selected by proper connection of various jumpers (see Figure 72 to Figure 76). Figure 70 shows the typical bench characterization setup used to evaluate the ac performance of the AD9228. It is critical that the signal sources used for the analog input and clock have very low phase noise (<1 ps rms jitter) to realize the optimum performance of the converter. Proper filtering of the analog input signal to remove harmonics and lower the integrated or broadband noise at the input is also necessary to achieve the specified noise performance. See Figure 72 to Figure 80 for the complete schematics and layout diagrams that demonstrate the routing and grounding techniques that should be applied at the system level. POWER SUPPLIES This evaluation board comes with a wall-mountable switching power supply that provides a 6 V, 2 A maximum output. Simply connect the supply to the rated 100 V ac to 240 V ac wall outlet at 47 Hz to 63 Hz. The other end is a 2.1 mm inner diameter jack that connects to the PCB at P503. Once on the PC board, the 6 V supply is fused and conditioned before connecting to three low dropout linear regulators that supply the proper bias to each of the various sections on the board. When operating the evaluation board in a nondefault condition, L504 to L507 can be removed to disconnect the switching power supply. This enables the user to bias each section of the board individually. Use P501 to connect a different supply for each section. At least one 1.8 V supply is needed with a 1 A current capability for AVDD_DUT and DRVDD_DUT; however, it is recommended that separate supplies be used for both analog and digital. To operate the evaluation board using the VGA option, a separate 5.0 V analog supply is needed. The 5.0 V supply, or AVDD_5 V, should have a 1 A current capability. To operate the evaluation board using the SPI and alternate clock options, a separate 3.3 V analog supply is needed in addition to the other supplies. The 3.3 V supply, or AVDD_3.3 V, should have a 1 A current capability as well. INPUT SIGNALS When connecting the clock and analog source, use clean signal generators with low phase noise, such as Rohde & Schwarz SMHU or HP8644 signal generators or the equivalent. Use a 1 m, shielded, RG-58, 50 Ω coaxial cable for making connections to the evalu- ation board. Enter the desired frequency and amplitude from the ADC specifications tables. Typically, most ADI evaluation boards can accept ~2.8 V p-p or 13 dBm sine wave input for the clock. When connecting the analog input source, it is recommended to use a multipole, narrow-band, band-pass filter with 50 Ω terminations. ADI uses TTE, Allen Avionics, and K&L types of band-pass filters. The filter should be connected directly to the evaluation board if possible. OUTPUT SIGNALS The default setup uses the HSC-ADC-FPGA high speed deserialization board to deserialize the digital output data and convert it to parallel CMOS. These two channels interface directly with the ADI standard dual-channel FIFO data capture board (HSC-ADC-EVALA-DC). Two of the four channels can then be evaluated at the same time. For more information on channel settings on these boards and their optional settings, visit www.analog.com/FIFO. ROHDE & SCHWARZ, SMHU, 2V p-p SIGNAL SYNTHESIZER ROHDE & SCHWARZ, SMHU, 2V p-p SIGNAL SYNTHESIZER BAND-PASS FILTER XFMR INPUT CLK CHA–CHD 12-BIT SERIAL LVDS 2 CH 12-BIT PARALLEL CMOS USB CONNECTION AD9228 EVALUATION BOARD HSC-ADC-FPGA HIGH SPEED DESERIALIZATION BOARD HSC-ADC-EVALA-DC FIFO DATA CAPTURE BOARD PC RUNNING ADC ANALYZER AND SPI USER SOFTWARE 1.8V –+ –+ –+ 5.0V 1.8V 6V DC 2A MAX WALL OUTLET 100V TO 240V AC 47Hz TO 63Hz SWITCHING POWER SUPPLY –+ 3.3V –+ 3.3V –+ 1.5V –+ 3.3V SPI SPI SPI SPI Figure 70. Evaluation Board Connection |
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