AD8011AN(2000) 查看數據表（PDF） - Analog Devices
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AD8011AN Datasheet PDF : 16 Pages
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AD8011
LAYOUT CONSIDERATIONS
The specified high speed performance of the AD8011 requires
careful attention to board layout and component selection.
Table I shows the recommended component values for the
AD8011 and Figures 38–40 show the layout for the AD8011
evaluation board (8-lead SOIC, Gain = +2). Proper RF design
techniques and low parasitic component selection 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 Fig-
ure 37). One end should be connected to the ground plane
and the other within 1/8 in. of each power pin. An additional
(4.7 µF–10 µF) tantalum electrolytic capacitor should be con-
nected in parallel.
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 greater than 1.5 pF at the inverting
input will significantly affect high speed performance when
operating at low noninverting gains.
Stripline design techniques should be used for long signal traces
(greater than about 1 in.). These should be designed with the
proper system characteristic impedance and be properly termi-
nated at each end.
RG
RF
RO
VIN
RT
VOUT
C1
C3
+VS
0.01F
10F
C2
C4
0.01F
10F
–VS
INVERTING CONFIGURATION
RG
RF
RO
VOUT
VIN
RT
C1
C3
+VS
0.01F
10F
C2
0.01F
C4
10F
–VS
NONINVERTING CONFIGURATION
Figure 37. Inverting and Noninverting Configurations
Table I. Typical Bandwidth vs. Gain Setting Resistors
Gain
RF (⍀)
RG (⍀)
–1
1000
1000
–2
1000
499
–10
499
49.9
+1
1000
+2
1000
1000
+10
422
47.5
+6
1000
200
+6
500
100
RT chosen for 50 Ω characteristic input impedance.
RO chosen for characteristic output impedance.
RT (⍀)
52.3
54.9
49.9
49.9
49.9
49.9
49.9
Small Signal –3 dB BW
(MHz), VS = ؎5 V
150
130
140
400
250
100
70
170
–14–
REV. B
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