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AD9042ST/PCB 数据表(PDF) 14 Page - Analog Devices |
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AD9042ST/PCB 数据表(HTML) 14 Page - Analog Devices |
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14 / 24 page  AD9042 –14– REV. A transformer, a sine wave could have been used; however, note that U5 requires TTL levels to function properly. AD9042 output data is latched using 74ACT574 (U3, U4) latches following 499 ohm series resistors. The resistors limit the current that would otherwise flow due to the digital output slew rate. The resistor value was chosen to represent a time constant of ~25% of the data rate at 40 MHz. This reduces slew rate while not appreciably distorting the data waveform. Data is latched in a pipeline configuration; a rising edge generates the new AD9042 data sample, latches the previous data at the converter output, and strobes the external data register over J3. Power and ground must be applied to J3 to power the digital logic section of the evaluation board. NC = NO CONNECT 14 13 12 11 10 9 8 1 2 3 4 7 6 5 17 16 15 20 19 18 28 27 26 25 24 23 22 21 GND D8 D9 D10 (MSB) D11 DVCC ENCODE D5 D6 D7 ENCODE AIN VOFFSET VREF D2 D3 D4 AVCC GND AVCC D1 NC NC (LSB) D0 GND GND GND GND U2 AD9042 GND GND GND GND GND +5V GND +5VA +5VA R2 499 Ω 2 9 8 7 6 3 4 5 12 13 14 15 16 17 18 19 R3 499 Ω R4 499 Ω R5 499 Ω R6 499 Ω R7 499 Ω U3 74ACT574 8D 7D 5D 1D 4D 6D 3D 2D 5Q 6Q 7Q 8Q 2Q 3Q 4Q 1Q OE CK B06 B07 B08 B09 B10 B11 GND GND 3 2 1 4 6 T1 T1–1T R15 100 Ω U1 K1115 14 7 8 VCC VEE C14 0.1µF +5VA 1 2 3 U5 74AS00 5 6 U5 74AS00 4 BUFLAT BNC J1 BNC J2 R1 60.4 Ω C2 0.1µF R14 49.9 Ω C3 0.1µF 11 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND +5V B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00 GND GND GND GND GND 2 9 8 7 6 3 4 5 12 13 14 15 16 17 18 19 U4 74ACT574 8D 7D 5D 1D 4D 6D 3D 2D 5Q 6Q 7Q 8Q 2Q 3Q 4Q 1Q OE CK B00 B01 B02 B03 B04 B05 GND GND 11 1 OUT BUFLAT R8 499 Ω R9 499 Ω R10 499 Ω R11 499 Ω R12 499 Ω R13 499 Ω H40DM J3 +5V C6 10µF + C7 0.1µF C11 0.1µF C12 0.1µF C13 0.1µF C15 0.1µF C16 0.1µF +5VA C4 10µF + C8 0.1µF C9 0.1µF C17 0.1µF Figure 37. AD9042D/PCB Schematic Table I. AD9042D/PCB Bill of Material Item Quantity Reference Description 1 2 +5VA, GND Banana Jack 2 10 C2–C3, C7–C9, C11–C17 Ceramic Chip Capacitor 0805, 0.1 µF 3 2 C4, C6 Tantalum Chip Capacitor 10 µF 4 1 J3 40-Pin Double Row Male Header 5 2 J1, J2 BNC Coaxial PCB Connector 6 1 R1 Surface Mount Resistor 1206, 60.4 ohms 7 12 R2–R13 Surface Mount Resistor 1206, 499 ohms 8 1 R14 Surface Mount Resistor 1206, 49.9 ohms 9 1 R15 Surface Mount Resistor 1206, 100 ohms 10 1 T1 Surface Mount Transformer Mini-Circuits T1–1T 11 1 U1 40.96 MHz Clock Oscillator 12 1 U2 AD9042AD 12-Bit–41 MSPS ADC Converter 13 2 U3, U4 74ACT574 Octal Latch 14 1 U5 74AS00 Quad Two Input NAND Gate |
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