ADL5519ACPZ-R2 datasheet(29/39 Pages) AD

29 / 39 page

Data Sheet

ADL5519

Rev. B | Page 29 of 39

If VLVL is connected to the OUTA pin, OUTB is forced to equal

OUTA through the feedback loop. This flexibility provides the

capability to measure one channel operating at a given power

level and frequency while forcing the other channel to a desired

power level at another frequency. The voltages applied to the

ADJA, ADJB pins should be selected carefully to minimize

temperature drift of the output voltage. The temperature drift is

the statistical sum of the drift from Channel A and Channel B.

As stated previously, VLVL can be used to force the slaved

channel to operate at a different power from the other channel.

If the two channels are forced to operate at different power levels,

some static offset occurs due to voltage drops across metal wiring

in the IC.

If an inversion is necessary in the feedback loop, OUTN can be

used as the integrator by placing a capacitor between OUTN,

OUTP. This changes the output equation for OUTB and OUTP to

OUTB = 2 × OUTA − VLVL

(21)

For VLVL < OUTA/2,

OUTN = 0 V

(22)

Otherwise,

OUTN = 2 × VLVL − OUTA

(23)

Equation 18 to Equation 23 are valid when Channel A is driven

and Channel B is slaved through a feedback loop. When Channel B

is driven and Channel A is slaved, these equations can be altered

by changing OUTB to OUTA and OUTN to OUTP.

ADL5519ACPZ-R2 データシート(PDF) 29 Page - Analog Devices