ADL5519ACPZ-R2 datasheet(17/27 Pages) AD

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Preliminary Technical Data

ADL5519

Rev. PrB | Page 17 of 27

ADL5519ACPZ

EXPOSED PADDLE

CLPA

TEMP

VPSR

ADJA

CLPB

VLVL

VREF

ADJB

VPSB

VSTA

VSTB

OUTB

FBKB

OUTN

OUTP

FBKA

OUTA

VPSA

INHB

INLB

COMR

PWDN

INLA

INHA

COMR COMR

COMR

INHA

47nF

VPSB

C11

100pF

C16

0.1

μF

R11

R10

DIFF OUT +

DIFF OUT –

100pF

C15

0.1

μF

VPSA

100pF

C12

0.1

μF

VPSR

SEE

TEXT

52.3

INHB

47nF

52.3

47nF

R12

SETPOINT

VOLTAGE B

OUTPUT

VOLTAGE B

R20

SETPOINT

VOLTAGE B

OUTPUT

VOLTAGE B

R21

SEE

TEXT

SEE

TEXT

SEE

TEXT

SEE

TEXT

Figure 19. Basic Connections for Operation in Measurement Mode

CONTROLLER MODE

In addition to being a measurement device, the ADL5519 can

also be configured to measure and control signal levels. The

ADL5519 has two controller modes. Each of the two log

detectors can be separately configured to set and control the

output power level of a variable gain amplifier (VGA) or

variable voltage attenuator (VVA). Alternatively, the two log

detectors can be configured to measure and control the gain of

an amplifier or signal chain.

The channel difference outputs can be used for controlling a

feedback loop to the ADL5519’s RF inputs. A capacitor connected

between FBKA and OUTP forms an integrator, keeping in mind

that the on-chip 1 kΩ feedback resistor forms a zero. (The value

of the on-chip resistors can vary as much as ±20% with manufac-

turing process variation.) If Channel A is driven and Channel B

has a feedback loop from OUTP through a PA, then OUTP

integrates to a voltage value such that

OUTB = (OUTA + VLVL)/2

(11)

The output value from OUTN may or may not be useful. It is

given by

OUTN = 0 V

(12)

For VLVL < OUTA/3,

Otherwise,

OUTN = (3 × VLVL – OUTA)/2

(13)

If VLVL is connected to OUTA, then OUTB is forced to equal

OUTA through the feedback loop. This flexibility provides the

user with 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. ADJA and ADJB

should be set to different voltage levels to reduce the temperature

drift of the output measurement. The temperature drift will be

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

stated before, VLVL can be used to force the slaved channel to

operate at a different power than the other channel. If the two

channels are forced to operate at different power levels, then

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

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