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AD9048TQ-883B Arkusz danych(PDF) 7 Page - Analog Devices |
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AD9048TQ-883B Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 8 page AD9048 –7– REV. F LAYOUT SUGGESTIONS Designs that use the AD9048 or any other high speed device must follow some basic layout rules to ensure optimum performance. The first requirement is to have a large, low impedance ground plane under and around the converter. If the system uses separate analog and digital grounds, both should be solidly connected together, and to the ground plane, as closely to the AD9048 as practical to avoid ground loop currents. Ceramic 0.1 µF decoupling capacitors should be placed as closely as possible to the supply pins of the AD9048. For decoupling low frequency signals, use 10 µF tantalum capacitors also con- nected as closely as practical to voltage supply pins. Within the AD9048, reference currents may vary because of coupling between the clock and input signals. As a result, it is important that the ends of the reference ladder, RT (Pin 18) and RB (Pin 26), be connected to low impedances (as measured from ground). If the AD9048 is being used in a circuit in which the reference is not varied, a bypass capacitor to ground is strongly recom- mended. In applications that use varying references, they must be driven from a low impedance source. 0.1 F VEE VCC +5.0V –5.2V VIN RT RB CONVERT 43 AD9048 R R 50 1k 100 2N3906 AD741 5 1k 0.1 F 0.1 F 2k 27 0.1 F –5.2V 0.1 F ANALOG INPUT (0V TO 2V) TTL CONVERT SIGNAL D1 (MSB) D8 (LSB) 10k AD589 AD9617/AD9618, AD9620/AD9630, AD847 Figure 7. Typical Connections Table I. Truth Table Offset Twos Binary Complement Step Range True Inverted True Inverted –2.000 V FS –2.0480 V FS NMINV = 1 0 0 1 7.8431 mV Step 8.000 mV Step NLINV = 1 0 1 0 000 0.0000 V 0.0000 V 00000000 11111111 10000000 01111111 001 –0.0078 V –0.0080 V 00000001 11111110 10000001 01111110 •• • • • • • •• • • • • • •• • • • • • 127 –0.9961 V –1.0160 V 01111111 10000000 11111111 00000000 128 –1.0039 V –1.0240 V 10000000 01111111 00000000 11111111 129 –1.0118 V –1.0320 V 10000001 01111110 00000001 11111110 •• • • • • • •• • • • • • •• • • • • • 254 –1.9921 V –2.0320 V 11111110 00000001 01111110 10000001 255 –2.0000 V –2.0400 V 11111111 00000000 01111111 10000000 |
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