ADL5519ACPZ-R2 AD [Analog Devices], ADL5519ACPZ-R2 Datasheet - Page 17

• Manufacturer Part Number: ADL5519ACPZ-R2
• Description: 1 MHz to 10 GHz, 50 dB Dual Log Detector/Controller
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
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
The output value from OUTN may or may not be useful. It is
given by
OUTB = (OUTA + VLVL)/2
INHA
INHB
52.3Ω
52.3Ω
R5
R6
47nF
47nF
47nF
47nF
C2
VPSA
C1
C3
C4
0.1μF
C12
25
26
27
28
29
30
31
32
Figure 19. Basic Connections for Operation in Measurement Mode
INHA
INLA
COMR
PWDN
COMR
INLB
INHB
COMR
COMR
COMR COMR
100pF
24
1
R3
0Ω
C7
C11
100pF
C16
0.1μF
COMR
23
2
VPSA
VPSB
VPSB
22
3
(11)
R11
ADL5519ACPZ
0Ω
EXPOSED PADDLE
Rev. PrB | Page 17 of 27
ADJA
ADJB
21
4
TEXT
SEE
TEXT
SEE
0Ω
R4
VPSR
VPSR
VREF
20
5
R7
0Ω
TEMP
VLVL
C15
0.1μF
C8
100pF
19
6
For VLVL < OUTA/3,
Otherwise,
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
TEXT
SEE
CLPB
CLPA
18
7
OUTN = 0 V
OUTN = (3 × VLVL – OUTA)/2
TEXT
TEXT
SEE
SEE
VSTA
VSTB
17
8
OUTP
OUTN
FBKB
OUTB
OUTA
FBKA
NC
NC
16
15
14
13
12
10
11
9
R12
R8
0Ω
0Ω
R10
R21
R9
0Ω
0Ω
R20
0Ω
0Ω
1kΩ
1kΩ
R1
R2
OUTPUT
VOLTAGE B
SETPOINT
VOLTAGE B
DIFF OUT +
DIFF OUT –
OUTPUT
VOLTAGE B
SETPOINT
VOLTAGE B
ADL5519
(12)
(13)