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AD8001ART-REEL7 Fiches technique(PDF) 14 Page - Analog Devices

No de pièce AD8001ART-REEL7
Description  800 MHz, 50 mW Current Feedback Amplifier
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8001ART-REEL7 Fiches technique(HTML) 14 Page - Analog Devices

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REV. C
AD8001
–14–
Layout Considerations
The specified high speed performance of the AD8001 requires
careful attention to board layout and component selection.
Proper RF design techniques and low parasitic component selec-
tion are mandatory.
The PCB should have a ground plane covering all unused por-
tions of the component side of the board to provide a low im-
pedance ground path. The ground plane should be removed
from the area near the input pins to reduce stray capacitance.
Chip capacitors should be used for supply bypassing (see Figure
49). One end should be connected to the ground plane and the
other within 1/8-inch of each power pin. An additional large
(4.7
µF–10 µF) tantalum electrolytic capacitor should be con-
nected in parallel, but not necessarily so close, to supply current
for fast, large-signal changes at the output.
The feedback resistor should be located close to the inverting
input pin in order to keep the stray capacitance at this node to a
minimum. Capacitance variations of less than 1 pF at the invert-
ing input will significantly affect high speed performance.
Stripline design techniques should be used for long signal traces
(greater than about 1 in.). These should be designed with a
characteristic impedance of 50
Ω or 75 Ω and be properly termi-
nated at each end.
Inverting Configuration
Supply Bypassing
C1
0.1 F
C2
0.1 F
+VS
–VS
C3
10 F
C4
10 F
Noninverting Configuration
RF
RO
IN
+VS
–VS
RS
RT
RG
OUT
RF
RO
IN
+VS
–VS
RT
RG
OUT
Figure 49. Inverting and Noninverting Configurations for Evaluation Boards
Table I. Recommended Component Values
AD8001AN (DIP)
AD8001AR (SOIC)
AD8001ART (SOT-23-5)
Gain
Gain
Gain
Component
–1
+1
+2
+10
+100
–1
+1
+2
+10
+100
–1
+1
+2
+10
+100
RF (Ω)
649
1050
750
470
1000
604
953
681
470
1000
845
1000 768
470
1000
RG (Ω)
649
750
51
10
604
681
51
10
845
768
51
10
RO (Nominal) (Ω) 49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
49.9
RS (Ω)0
0
0
RT (Nominal) (Ω)
54.9
49.9
49.9
49.9
49.9
54.9
49.9
49.9
49.9
49.9
54.9
49.9
49.9
49.9
49.9
Small Signal
340
880
460
260
20
370
710
440
260
20
240
795
380
260
20
BW (MHz)
0.1 dB Flatness
105
70
105
130
100
120
110
300
145
(MHz)


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