ADL5902-EVALZ AD [Analog Devices], ADL5902-EVALZ Datasheet - Page 25

• Manufacturer Part Number: ADL5902-EVALZ
• Description: 50 MHz to 9 GHz 65 dB TruPwr Detector
• Manufacturer: AD [Analog Devices]

EVALUATION BOARD SCHEMATICS AND ARTWORK
Table 8. Evaluation Board Configuration Options
Component
C6, C10, C11,
C12, R3
R7, R8, R10,
R11
C4, C5, C7,
C13, R14, R16
R1, R2, R6,
R13, R15
C8, C9, R5
R9, R12
Paddle
IN
60.4Ω
R3
connected to VREF through a resistor divider (R9, R12).
Function/Notes
RF input. The ADL5902 is generally driven single-ended. When driving INHI, populate C10 and C12
with an appropriate capacitor value for the frequency of operation and leave C6 and C11 open.
When driving INLO, populate C6 and C11 with an appropriate capacitor value for the frequency of
operation and leave C10 and C12 open. R3 is the input termination resistor and is chosen to give a
50 Ω input impedance over a broad frequency range.
VTGT interface. R10 and R11 are set up to provide 0.8 V to VTGT derived from VREF. If R10 and R11
are removed, an external voltage can be applied. Alternatively, R7 and R11 can be used to form a
voltage divider for an external reference.
Power supply decoupling. The nominal supply decoupling consists of a 100 pF filter capacitor
placed close to the ADL5902, a 0 Ω series resistor, and a 0.1 μF capacitor placed close to the power
supply input pin.
Output interface. In measurement mode, a portion of the voltage at the VOUT pin is fed back to
the VSET pin via R6. Using the voltage divider created by R2 and R6, the magnitude of the slope of
V
must be open and R13 must have a 0 Ω resistor. In this mode, the ADL5902 can control the gain of
an external component. A setpoint voltage is applied to the VSET pin, the value of which
corresponds to the desired RF input signal level applied to the ADL5902.
Low-pass filter capacitors, C
affect the response time of the ADL5902.
TADJ/PWDN. The TADJ/PWDN pin controls the amount of nonlinear intercept temperature
compensation and/or shuts down the device. The evaluation board is configured with TADJ
The paddle should be tied to both a thermal ground and an electrical ground.
OUT
is increased by reducing the portion of V
OPEN
0.1µF
C10
C6
OPEN
0.1µF
C11
C12
LPF
. The low-pass filter capacitors reduce the noise on the output and
301Ω
TC2_PWDN
R12
1kΩ
R11
0Ω
R7
Figure 54. Evaluation Board Schematic
VTGT
13
14
15
16
1430Ω
R9
NC
INHI
INLO
NC
VREF
1.87kΩ
R10
Rev. 0 | Page 25 of 28
OUT
VREF
12
VPOSC
1
that is fed back to V
R8
0Ω
ADL5902
11
2
DUT1
VPOS2
10
3
R14
0Ω
R16
9
4
0Ω
VPOS1
0.1µF
100pF
C7
VPOS
C5
VOUT
TEMP
VSET
CLPF
100pF
0.1µF
C13
C4
SET
. In controller mode, R6
8
7
6
5
PADDLE
TEMP
AGND
R2
OPEN
R6
0Ω
R5
0Ω
GND
C9
0.1µF
OPEN
R13
0Ω
R1
C8
OPEN
VSET
GND
VOUT
R15
0Ω
Default Value
C6 = open,
C10 = C12 = 0.1 µF,
C11 = open,
R3 = 60.4 Ω
R7 = R8 = 0 Ω,
R10 = 1.87 kΩ,
R11 = 1k Ω
C4 = C5 = 100 pF,
C7 = C13 = 0.1 µF,
R14 = R16 = 0 Ω
R1 = R6 = R15 = 0 Ω,
R2 = R13 = open
C8 = open,
C9 = 0.1 µF,
R5 = 0 Ω,
R9 = 1430 Ω
R12 = 301 Ω
VOUTP
ADL5902