ADL5565 AD [Analog Devices], ADL5565 Datasheet - Page 23

• Manufacturer Part Number: ADL5565
• Description: 6 GHz Ultrahigh Dynamic Range Differential Amplifier
• Manufacturer: AD [Analog Devices]

SOLDERING INFORMATION
On the underside of the chip-scale package, there is an exposed
compressed paddle. This paddle is internally connected to the
ground of the chip. Solder the paddle to the low impedance
ground plane on the PCB to ensure the specified electrical
performance and to provide thermal relief. To further reduce
thermal impedance, it is recommended that the ground planes
on all layers under the paddle be stitched together with vias.
EVALUATION BOARD
Figure 44 shows the schematic of the
The board is powered by a single supply in the 3 V to 5 V range.
The power supply is decoupled by 10 μF and 0.1 μF capacitors.
Table 15 details the various configuration options of the evaluation
board. Figure 45 and Figure 46 show the component and circuit
side layouts of the evaluation board.
To realize the minimum gain (6 dB into a 200 Ω load), Input 1
(VIN1 and VIP1) must be used by installing 0 Ω resistors at R3
and R4, leaving R5 and R6 open. R1 and R2 must be 33.2 Ω for
a 50 Ω input impedance.
J1
R13
0Ω
OPEN
OPEN
R12
C12
T1
J2
OPEN
OPEN
OPEN
R1
R2
VPOS
0.01µF
0.01µF
C1
C2
ADL5565
R5
0Ω
R3
0Ω
R4
0Ω
R6
0Ω
C3
10µF
1
2
3
4
evaluation board.
C4
0.1µF
VIN1
VIN2
VIP2
VIP1
GND
VCC
16
5
Figure 44. Evaluation Board Schematic
ADL5565
GND GND
VCC
C5
0.1µF
15
6
VCC
Rev. 0 | Page 23 of 28
14
7
C6
0.1µF
VCOM
GND
ENBL
VCC
13
VON
VOP
8
C7
0.1µF
12
11
10
9
Likewise, driving Input 2 (VIN2 and VIP2) realizes the middle
gain (12 dB into a 200 Ω load) by installing 0 Ω at R5 and R6
and leaving R3 and R4 open. R1 and R2 must be 50 Ω for a
50 Ω input impedance.
For the maximum gain (15.5 dB into a 200 Ω load), both inputs
are driven by installing 0 Ω resistors at R3, R4, R5, and R6. R1
and R2 are open for a 50 Ω input impedance.
The balanced input and output interfaces are converted to
single ended with a pair of baluns (M/A-COM ETC1-1-13).
The balun at the input, T1, provides a 50 Ω single-ended-to-
differential transformation. The output balun, T2, and the
matching components are configured to provide a 200 Ω to 50 Ω
impedance transformation with an insertion loss of about 11 dB.
As an alternative, the input transformer, T1, can be replaced with
one of the following transformers to provide a low loss balanced
input to the ADL5565.
•
•
•
When using these alternative transformers, R1 and R2 are left
open. Replace C1 and C2 with 0 Ω jumpers and add a 0.1 μF
capacitor to C12.
0.01µF
0.01µF
C10
C11
0.1µF
C9
6 dB gain configuration, Mini-Circuits TC4-1W+
12 dB gain configuration, Mini-Circuits, TC2-1T+
15.5 dB gain configuration, Mini-Circuits TC1.5-52T
VPOS
GND
AGND
VCOM
P1
84.5Ω
84.5Ω
ENBL
R7
R8
34.8Ω
34.8Ω
C8
0.1µF
R10
R9
OPEN
C13
T2
R14
0Ω
OPEN
R11
OPEN
R15
J4
OPEN
J3
ADL5565