ADL5523 Просмотр технического описания (PDF) - Analog Devices
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ADL5523 Datasheet PDF : 24 Pages
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Data Sheet
EVALUATION BOARD
Figure 54 shows the schematic of the ADL5523 evaluation board.
The board is powered by a single supply, and dc bias can be
applied to the board through clip-on leads at VPOS and GND
or through a 2-pin connector, W1.
The evaluation board comes optimized at 1950 MHz from the
factory, but it can be easily modified to work at any frequency
between 400 MHz and 4 GHz. Table 7 lists the recommended
components at various frequencies.
VPOS
W1
R2
GND
C5
L2 100nF
TR1
C4
DNP
TR2 C3
R1
RFIN
L1
C1
ADL5523
1 VBIAS VPOS 8
2 RFIN RFOUT 7
3 NC
NC 6
4 NC
NC 5
RFOUT
C2
0Ω
Z1
Figure 54. Evaluation Board Schematic
ADL5523
Figure 56. Evaluation Board Layout (Bottom View)
SOLDERING INFORMATION AND RECOMMENDED
PCB LAND PATTERN
Figure 57 shows the recommended land pattern for ADL5523.
To minimize thermal impedance, the exposed pad on the
package underside is soldered down to a ground plane. If
multiple ground layers exist, they are stitched together using
vias (a minimum of five vias is recommended). Pin 3 to Pin 6
can be left unconnected or can be connected to ground. For
more information on land pattern design and layout, refer to
the AN-772 Application Note, A Design and Manufacturing
Guide for the Lead Frame Chip Scale Package (LFCSP).
2.03mm
1
8
4
5
0.71mm
1.53mm
Figure 57. Recommended Land Pattern
Figure 55. Evaluation Board Layout (Top View)
Table 7. Recommended Components and Positions of Matching Components for Basic Connections Tuned for Optimal Noise
Frequency
(MHz)
C11
(Size
0402)
C2
(Size
0402)
C3
(Size
0402)
C4
(Size
0402)
C5
(Size
0402)
L12
(Size
0403)
L22
Size
0403)
R13
(Size
0603)
R24
(Size
0603)
TR1
(mm)
TR2
(mm)
C1
C3
Position Position
500
Open 0 Ω Open Open 100 nF 9 nH 12 nH 1.3 kΩ 0 Ω 0
0
C1
N/A
900
2.4 pF 0 Ω Open Open 100 nF 8.2 nH 3.4 nH 1.3 kΩ 0 Ω 0
0
C1
N/A
1300
2.7 pF 0 Ω
1.0 nF Open 100 nF 3.4 nH 0 Ω
1.3 kΩ 0 Ω
0
8.0 × 0.6 C1
6
1950
1.6 pF 0 Ω
1.0 nF Open 100 nF 1.0 nH 0 Ω
1.3 kΩ 0 Ω
2.5 × 0.6 5.5 × 0.6 C1
4
2140
1.6 pF 0 Ω
1.0 nF Open 100 nF 1.0 nH 0 Ω
1.3 kΩ 0 Ω
5.0 × 0.6 3.0 × 0.6 C1
2
2600
0.75 pF 0 Ω
1.0 nF Open 100 nF 1.0 nH 0 Ω
1.3 kΩ 0 Ω
8.0 × 0.6 0
C1
C3
3500
0.5 pF 0 Ω
1.0 nF Open 100 nF 2.4 pF5 0 Ω
1.3 kΩ 0 Ω
7.0 × 0.6 1 × 0.6 C1
1
1 The Murata GJM High-Q series capacitor is recommended for C1.
2 The Coilcraft High Q 0403HQ or 0402HP inductors are recommended for L1 and L2.
3 If R2 = 8 Ω, reduce R1 to 600 Ω.
4 If R2 = 8 Ω, use a high power resistor (0.2 W rating minimum).
5 Note that at 3500 MHz, a capacitor, not an inductor, is used at L1.
Rev. B | Page 17 of 24
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