AD6679 datasheet(80/81 Pages) AD

80 / 81 page

AD6679

Data Sheet

Rev. B | Page 80 of 81

APPLICATIONS INFORMATION

POWER SUPPLY RECOMMENDATIONS

The AD6679 must be powered by the following six supplies:

AVDD1 = 1.25 V, AVDD2 = 2.5 V, AVDD3 = 3.3 V, DVDD =

1.25 V, DRVDD = 1.25 V, SPIVDD = 1.8 V. For applications

requiring an optimal high power efficiency and low noise

performance, it is recommended that the ADP2164 and

ADP2370 switching regulators be used to convert the 3.3 V,

5.0 V, or 12 V input rails to an intermediate rail (1.8 V and

3.8 V). These intermediate rails are then postregulated by very

low noise, low dropout (LDO) regulators (ADP1741, ADM7172,

and ADP125). Figure 87 shows the recommended method.

For more detailed information on the recommended power

solution, see the AD6679 evaluation board wiki, Evaluating the

AD6679 IF Diversity Receiver.

AVDD1

1.25V

DVDD

1.25V

SPIVDD

(1.8V OR 3.3V)

3.6V

3.3V

DRVDD

1.25V

1.8V

ADP1741

ADP125

AVDD3

3.3V

ADM7172

ADP1741

AVDD2

2.5V

ADP1741

Figure 87. High Efficiency, Low Noise Power Solution for the AD6679

It is not necessary to split all of these power domains in all

cases. The recommended solution shown in Figure 87 provides

the lowest noise, highest efficiency power delivery system for

the AD6679. If only one 1.25 V supply is available, it must be

routed to AVDD1 first and then tapped off and isolated with a

ferrite bead or a filter choke preceded by decoupling capacitors

for SPIVDD, DVDD, and DRVDD, in that order. The user can

use several different decoupling capacitors to cover both high

and low frequencies. These capacitors must be located close to

the point of entry at the PCB level and close to the devices, with

minimal trace lengths.

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