Evaluation Board User Guide UG-312
Rev. 0 | Page 3 of 4
EVALUATION BOARD CONFIGURATION OPTIONS
Table 1.
Component Description Default Condition
VPOS, GND Ground and supply vector pins. Not applicable
C13, C14 Power supply decoupling. Nominal supply decoupling of 0.01 μF and 100 pF.
C13 = 100 pF (Size 0402)
C14 = 0.1 μF (Size 0402)
C17
RMS filter capacitor (FLT4). The internal rms averaging capacitor can be augmented by
placing additional capacitance in C17.
C17 = 0.1 μF (Size 0402)
R5, C1
RF input interface. The 75 Ω resistor at R5 combines with the ADL5511 internal input
impedance to give a broadband input impedance of around 50 Ω. C1 is an ac coupling
capacitor, which should be chosen according to nominal carrier frequency.
R5 = 75 Ω (Size 0402)
C1 = 100 pF (Size 0402)
R18, C9
RMS output and output filtering. The combination of C9 and the internal 100 Ω output
resistance can be used to form a low-pass filter to reduce the output noise on the VRMS
output beyond the reduction due to C17 (capacitor on FLT4). The rms output is available
on the VRMS clip-on test point. To observe VRMS using an SMA cable, an SMA connector
can be soldered onto the pad labeled VRMS1.
R18 = 0 Ω (Size 0402)
C9 = open (Size 0402)
VRMS clip-on test point =
installed
VRMS1 SMA connector =
open
R19, C8, R2,
JP1
VENV output and output filtering. The VENV output is available on the VENV SMA
connector. If post-envelope filtering is desired, R19 and C8 can be used to form a low-pass
filter at the VENV output.
R2 can be removed to isolate the JP1 jumper from the VENV SMA connector, and JP1 can
be installed and used to interface to a FET probe. This helps to eliminate any excessive
trace and connector capacitance.
VENV SMA connector =
installed
R19, R2 = 0 Ω (Size 0402)
C8 = open (Size 0402)
JP1 = open
R20, C7
Envelope reference output and output filtering. The EREF output is available on the EREF
clip-on test point. The dc reference voltage at Pin EREF can be filtered by the low-pass filter
formed by the combination of R20 and C7. To observe the EREF voltage using an SMA
cable, an SMA connector can be soldered onto the pad labeled EREF1.
R20 = 0 Ω (Size 0402)
C7 = open (Size 0402)
EREF clip-on test point =
installed
EREF1 SMA connector = open
R1, SW1
Device enable. When the switch is set toward the SW1 label, the ENBL pin is connected to VPOS,
which enables the ADL5511. In the opposite switch position, the ENBL pin is grounded, which
disables the ADL5511.
R1 = 0 Ω (Size 0402)
SW1 = towards SW1 label
C6, C10
Envelope carrier-removal filters (FLT2, FLT3). The corner frequency of the internal VENV two-pole
carrier-removal filter can be reduced by placing additional capacitors in C6 and C10.
C6, C10 = open (Size 0402)
C2
Envelope reference carrier-removal filter (FLT1). The internal filter that removes the carrier from
the envelope reference dc voltage can be augmented by placing a capacitor in C2.
C2 = 100 pF (Size 0402)
R3, R14, R15,
R16, R17
Alternate interface. The P2 edge connector provides an alternate access point to the
various ADL5511 signals.
R3, R14, R15, R16, R17 = open
(Size 0402)
