Datasheet
ADV7390/ADV7391/ADV7392/ADV7393 Data Sheet
Rev. J | Page 70 of 107
0
–80
–70
–60
–50
–40
–30
–20
–10
0
–30
–60
–90
–120
–150
–180
–210
–240
1M 10M 100M
FREQUENC
Y (Hz)
CIRCUIT FREQUENC
Y RESPONSE
1G
GROUP DELAY (Seconds)
PHASE (Degrees)
MAGNITUDE (dB)
21n
18n
15n
12n
9n
6n
3n
0
24n
GAIN (dB)
06234-089
Figure 90. Output Filter Plot for SD, 16× Oversampling
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1M
10M 100M
1G
FREQUENCY (Hz)
CIRCUIT FREQUENCY
RESPONSE
MAGNITUDE (dB)
GROUP DEL
AY (Seconds)
PHASE
(Degrees)
GAIN (dB)
320
240
160
80
0
–80
–160
–240
480
400
14n
12n
10n
8n
6n
4n
2n
0
18n
16n
06234-090
Figure 91. Output Filter Plot for ED, 8× Oversampling
0
–50
1
FREQUENCY (MHz)
CIRCUIT FREQUENCY RESPONSE
GAIN (dB)
PHASE (Degrees)
10 100
–10
–20
–30
–40
200
–200
120
40
–40
–120
GROUP DELAY (Seconds)
PHASE
(Degrees)
MAGNITUDE (dB)
06234-091
Figure 92. Output Filter Plot for HD, 4× Oversampling
PRINTED CIRCUIT BOARD (PCB) LAYOUT
The ADV7390/ADV7391/ADV7392/ADV7393 are highly
integrated circuits containing both precision analog and high
speed digital circuitry. It is 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
ADV7390/ADV7391/ADV7392/ADV7393 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 and R
SET
pins should be placed as close as possible
to, and on the same side of the PCB as, the ADV7390/ADV7391/
ADV7392/ADV7393. Adding vias to the PCB to get the
components closer to the ADV7390/ADV7391/ADV7392/
ADV7393 is not recommended.
It is recommended that the ADV7390/ADV7391/ADV7392/
ADV7393 be placed 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 ADV7390/ADV7391/ADV7392/ADV7393. The termination
resistors should overlay the PCB ground plane.
External filter and buffer components connected to the DAC
outputs should be placed as close as possible to the ADV7390/
ADV7391/ADV7392/ADV7393 to minimize the possibility of
noise pickup from neighboring circuitry and to minimize the
effect of trace capacitance on output bandwidth. This is particularly
important when operating in low-drive mode (R
SET
= 4.12 kΩ,
R
L
= 300 Ω).
Power Supplies
It is recommended that a separate regulated supply be provided
for each power domain (V
AA
, V
DD
, V
DD_IO
, and PV
DD
). For
optimal performance, linear regulators rather than switch mode
regulators should be used. If switch mode regulators must be
used, care must be taken with regard to the quality of the output
voltage in terms of ripple and noise. This is particularly true for
the V
AA
and PV
DD
power domains. Each power supply should be
individually connected to the system power supply at a single
point through a suitable filtering device, such as a ferrite bead.
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