AD8180ANZ Просмотр технического описания (PDF) - Analog Devices

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AD8180ANZ

750 MHz, 3.8 mA 10 ns Switching Multiplexers

Analog Devices 

AD8180/AD8182

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 kΩ resistors. In

order to avoid large gain errors, these load resistors should be

greater than or equal to 1 kΩ. 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.

ENABLE

SELECT

R8

49.9⍀

R9

49.9⍀

IN0

R1

49.9⍀

IN1

R10

49.9⍀ +VS

1 +1

8

2

DECODER

7

3 +1

6

4 AD8180R 5

OUT

(SCOPE PROBE

ADAPTER)

R7

–VS 4.99k⍀

C1

0.1␮F

+

C2

0.1␮F

+

C4

10␮F

C3

10␮F

UNLESS OTHERWISE NOTED, CONNECTORS ARE SMA TYPE

Figure 26. AD8180R Evaluation Board

ENABLE A

SELECT A

R8

49.9⍀

IN0 A

IN1 A

R1

49.9⍀

R9

49.9⍀

1 +1

14

R10

49.9⍀

C1

2

DECODER

13

0.1␮F

3 +1

12

+VS

+

4

AD8182R 11

IN1 B

C4

5 +1

10

10␮F

6

DECODER

9

R2

49.9⍀

7 +1

8

IN0 B

SELECT B

R3

49.9⍀

C2

0.1␮F

OUTA

(SCOPE PROBE

ADAPTER)

R7

4.99k⍀

+ –VS

C3

10␮F

R6

4.99k⍀

OUTB

(SCOPE PROBE

ADAPTER)

ENABLE B

R4

49.9⍀

R5

49.9⍀

UNLESS OTHERWISE NOTED, CONNECTORS ARE SMA TYPE

Figure 27. AD8182R Evaluation Board

–10–

REV. B

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