ADV7341_15 datasheet(74/108 Pages) AD

74 / 108 page

ADV7340/ADV7341

Data Sheet

Rev. C | Page 74 of 108

Figure 85. Example of Output Filter for HD, 4× Oversampling

Figure 86. Output Filter Plot for SD, 16× Oversampling

Figure 87. Output Filter Plot for ED, 8× Oversampling

Figure 88. Output Filter Plot for HD, 4× Oversampling

PRINTED CIRCUIT BOARD (PCB) LAYOUT

The ADV7340/ADV7341 are highly integrated circuits containing

both precision analog and high speed digital circuitry. They are

designed to minimize interference effects on the integrity of the

analog circuitry by the high speed digital circuitry. It is

imperative that these same design and layout techniques be

applied to the system-level design so that optimal performance

is achieved.

The layout should be optimized for lowest noise on the

ADV7340/ADV7341 power and ground planes by shielding the

digital inputs and providing good power supply decoupling.

It is recommended to use a 4-layer printed circuit board with

ground and power planes separating the signal trace layer and

the solder side layer.

Component Placement

Component placement should be carefully considered to separate

noisy circuits, such as clock signals and high speed digital circuitry,

from analog circuitry. The external loop filter components and

components connected to the COMP, VREF, and RSETx pins should

be placed as close as possible to, and on the same side of the PCB

as, the ADV7340/ ADV7341.

Adding vias to the PCB to get the components closer to the

ADV7340/ADV7341 is not recommended. It is recommended

to place the ADV7340/ADV7341 as close as possible to the

output connector, with the DAC output traces as short as

possible. The termination resistors on the DAC output traces

should be placed as close as possible to and on the same side of

the PCB as the ADV7340/ADV7341. The termination resistors

should overlay the PCB ground plane.

DAC

OUTPUT

390nH

33pF

Ω

500

Ω

300

Ω

75Ω

BNC

OUTPUT

500Ω

–80

–70

–60

–50

–40

–30

–20

–10

–30

–60

–90

–120

–150

–180

–210

–240

10M

100M

FREQUENCY (Hz)

CIRCUIT FREQUENCY RESPONSE

GROUP DELAY (Seconds)

PHASE (Degrees)

MAGNITUDE (dB)

21n

18n

15n

12n

24n

–10

–20

–30

–40

–50

–60

–70

–80

–90

10M

100M

FREQUENCY (Hz)

CIRCUIT FREQUENCY RESPONSE

MAGNITUDE (dB)

GROUP DELAY (Seconds)

PHASE

(Degrees)

320

240

160

–80

–160

–240

480

400

14n

12n

10n

18n

16n

–50

FREQUENCY (MHz)

CIRCUIT FREQUENCY RESPONSE

100

–10

–20

–30

–40

200

–200

120

–40

–120

GROUP DELAY (Seconds)

PHASE

(Degrees)

MAGNITUDE (dB)

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