adl5562 Analog Devices, Inc., adl5562 Datasheet - Page 19

• Manufacturer Part Number: adl5562
• Description: 3.3 Ghz Ultralow Distortion Rf/if Differential Amplifier
• Manufacturer: Analog Devices, Inc.

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 43 shows the schematic of the ADL5562 evaluation board.
The board is powered by a single supply in the 3.0 V to 3.6 V
range. The power supply is decoupled by 10 μF and 0.1 μF
capacitors.
Table 14 details the various configuration options of the evaluation
board. Figure 44 and Figure 45 show the component and circuit
layouts of the evaluation board.
J3
0.1µF
C12
T1
49.9Ω
49.9Ω
VPOS
R1
R2
R5
0Ω
R3
0Ω
R4
0Ω
R6
0Ω
C3
10µF
1
2
3
4
C4
0.1µF
VIP2
VIP1
VIN1
VIN2
GND
VCC
16
5
Figure 43. Evaluation Board Schematic
ADL5562
GND GND
VCC
C5
0.1µF
15
6
VCC
Rev. 0 | Page 19 of 24
14
7
C6
0.1µF
VOCM
GND
ENBL
VCC
13
VOP
VON
8
C7
0.1µF
12
11
10
9
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 Ω for a
50 Ω input impedance.
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 29 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 must be 40.2 Ω for a 50 Ω input impedance.
Both the input and output 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 con-
figured to provide a 200 Ω to 50 Ω impedance transformation
with an insertion loss of about 17 dB.
0.01µF
0.01µF
C10
C9
C11
0.1µF
VPOS
GND
AGND
P1
34.8Ω
34.8Ω
ENBL
R7
R8
J2
84.5Ω
84.5Ω
C8
0.1µF
R10
R9
0.1µF
C13
T2
OPEN
R11
J3
ADL5562