ADCA3270ACEZ-R7 datasheet(12/14 Pages) AD

12 / 14 page

ADCA3270

Data Sheet

Rev. 0 | Page 12 of 14

Figure 19. Recommended PCB Layout (Dimensions Shown in Millimeters)

ADCA3270 BIAS CURRENT

The ADCA3270 employs a versatile circuit design, allowing

system designers to configure the supply voltage at the VCC

connection (Pin 7) and the bias control voltage (VBIAS) at the

RFIP (Pin 1) and RFIN (Pin 4) connections to optimize the

power dissipation in any given application. It is recommended

that the ICC be controlled by employing a precision 5 V reference

and a resistor divider (R1 and R2) to set ICC as illustrated in

Figure 20. The voltage is connected to each input through a ferrite

bead (FB1 and FB2). The dc output of the balun used to feed the

RF into the power amplifier must be blocked using a capacitor.

REFERENCE

FB1

RFIP

RFIN

FB2

VBIAS

Figure 20. Setting the Bias Control Voltage

Figure 21 provides the typical transfer function of ICC to VBIAS,

which allows the user to adjust ICC from 380 mA to 480 mA.

480

470

450

410

430

350

370

390

460

420

440

360

380

400

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

VBIAS (V)

Figure 21. ICC vs. VBIAS

ADCA3270ACEZ-R7 数据表(PDF) 12 Page - Analog Devices

ADCA3270ACEZ-R7 数据表(HTML) 12 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

数据表下载