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AD9300KQ Datasheet(PDF) 7 Page - Analog Devices |
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AD9300KQ Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page AD9300 –7– REV. A Figure 8. Pulse Response Figure 10. Enable to Channel “Off” Response Figure 9. T-Step Response CROSSPOINT CIRCUIT APPLICATIONS Four AD9300 multiplexers can be used to implement an 8 × 2 crosspoint, as shown in Figure 11. The circuit is modular in concept, with each pair of multiplexers (#1 and #2; #3 and #4) forming an 8 × 1 crosspoint. When the inputs to all four units are connected as shown, the result is an 8 × 2 crosspoint circuit. Figure 11. 8 x 2 Signal Crosspoint Using Four AD9300 Multiplexers The truth table describes the relationships among the digital in- puts (D0–D5) and the analog inputs (S1-S8) and which signal input is selected at the outputs (OUT1 and OUT2). The num- ber of crosspoint modules that can be connected in parallel is limited by the drive capabilities of the input signal sources. High input impedance (3 M Ω) and low input capacitance (2 pF) of the AD9300 help minimize this limitation. 8 2 Crosspoint Truth Table D2 D1 D0 OUT1 or or or or D5 D4 D3 OUT2 00 0 S1 00 1 S2 01 0 S3 01 1 S4 10 0 S5 10 1 S6 11 0 S7 11 1 S8 Adding to the number of inputs applied to each crosspoint module is simply a matter of adding AD9300 multiplexers in parallel to the module. Eight devices connected in parallel result in a 32 × 1 crosspoint, which can be used with input signals hav- ing 30 MHz bandwidth and 1 V peak-to-peak amplitude. Even more AD9300 units can be added if input signal amplitude and/or bandwidth are reduced; if they are not, distortion of the output signals can result. When an AD9300 is enabled, its low output impedance causes the “off” isolation of disabled parallel devices to be greater than the crosstalk rejection of a single unit. |
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