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AD8180ARZ Datasheet(PDF) 10 Page - Analog Devices |
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AD8180ARZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page AD8180/AD8182 –10– REV. B EVALUATION BOARD Evaluation boards for the AD8180R and AD8182R are available which have been carefully laid out and tested to demonstrate the specified high speed performance of the devices. Figure 26 and Figure 27 show the schematics of the AD8180 and AD8182 evaluation boards respectively. For ordering information, please refer to the Ordering Guide. Because the footprint of the AD8180 fits directly on to that of the AD8182, one board layout can be used for both devices. In the case of the AD8180, only the top half of the board is populated. Figure 28 shows the silkscreen of the component side and Fig- ure 30 shows the silkscreen of the solder side. Figures 29 and 31 show the layout of the component side and solder side respectively. The evaluation board is provided with 49.9 Ω termination resis- tors on all inputs. This is to allow the performance to be evalu- ated at very high frequencies where 50 Ω termination is most popular. To use the evaluation board in video applications, the termination resistors should be replaced with 75 Ω resistors. The multiplexer outputs are loaded with 4.99 k Ω resistors. In order to avoid large gain errors, these load resistors should be greater than or equal to 1 k Ω. For connection to external instru- ments, oscilloscope scope probe adapters are provided. This allows direct connection of FET probes to the board. For verifi- cation of data sheet specifications, use of FET probes with a bandwidth > 1 GHz is recommended because of their low input capacitance. The probe adapters used on the board have the same footprint as SMA, SMB and SMC type connectors allow- ing easy replacement if necessary. 8 7 6 5 +VS C4 10 F C1 0.1 F R10 49.9 1 2 3 4 AD8180R DECODER +1 +1 + R1 49.9 IN1 IN0 SELECT R9 49.9 ENABLE R8 49.9 + –VS C3 10 F C2 0.1 F R7 4.99k OUT (SCOPE PROBE ADAPTER) UNLESS OTHERWISE NOTED, CONNECTORS ARE SMA TYPE Figure 26. AD8180R Evaluation Board –VS + +VS C1 0.1 F C4 10 F R10 49.9 1 2 3 4 14 13 12 11 AD8182R 5 6 7 10 9 8 DECODER +1 +1 DECODER +1 +1 R1 49.9 IN1 A IN0 A R9 49.9 SELECT A R8 49.9 ENABLE A R2 49.9 IN1 B IN0 B R3 49.9 R4 49.9 SELECT B R5 49.9 ENABLE B + C3 10 F C2 0.1 F OUTB (SCOPE PROBE ADAPTER) OUTA (SCOPE PROBE ADAPTER) R6 4.99k R7 4.99k UNLESS OTHERWISE NOTED, CONNECTORS ARE SMA TYPE Figure 27. AD8182R Evaluation Board |
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