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AD8003 Datasheet(PDF) 12 Page - Analog Devices

Part No. AD8003
Description  Triple, 1.5 GHz Op Amp
Download  16 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD8003 Datasheet(HTML) 12 Page - Analog Devices

 
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AD8003
Rev. A | Page 12 of 16
APPLICATIONS
GAIN CONFIGURATIONS
Unlike conventional voltage feedback amplifiers, the feedback
resistor has a direct impact on the closed-loop bandwidth and
stability of the current feedback op amp circuit. Reducing the
resistance below the recommended value can make the amplifier
response peak and can even become unstable. Increasing the
size of the feedback resistor reduces the closed-loop bandwidth.
Table 5 provides a convenient reference for quickly determining
the feedback and gain set resistor values, and the small and
large signal bandwidths for common gain configurations. The
feedback resistors in Table 5 have been optimized for 0.1 dB
flatness frequency response.
Table 5. Recommended Values and Frequency Response1
Gain
RF (Ω)
RG (Ω)
RS (Ω)
−3 dB
SS BW
(MHz)
Large
Signal
−3 dB
BW
Large
Signal
0.1 dB
BW
−1
300
300
0
734
668
--
+1
432
N/A
24.9
1650
822
--
+2
464
464
0
761
730
190
+5
300
75
0
567
558
165
+10
300
33.2
0
446
422
170
1Conditions: VS = ±5 V, TA = 25°C, RL = 150 Ω.
Figure 38 and Figure 39 show the typical noninverting and inverting
configurations and recommended bypass capacitor values.
FB
AD8003
10µF
0.1µF
RG
RS
+VS
VO
VIN
RL
+
VO
+V
–VS
–V
10µF
0.1µF
RF
Figure 38. Noninverting Gain
FB
AD8003
10µF
0.1µF
RG
+VS
VO
VIN
RL
+
VO
+V
–VS
–V
10µF
0.1µF
RF
Figure 39. Inverting Gain
RGB VIDEO DRIVER
Figure 40 shows a typical RGB driver application using
bipolar supplies. The gain of the amplifier is set at +2 , where
RF = RG = 464 Ω. The amplifier inputs are terminated with
shunt 75 Ω resistors, and the outputs have series 75 Ω resistors
for proper video matching. In Figure 40, the POWER DOWN
pins are not shown connected to any signal source for simplicity. If
the power-down function is not used, it is recommended that
the POWER DOWN pins be tied to the positive supply and not
be left floating (not connected).
In applications that require a fixed gain of +2, as previously
mentioned, the designer may consider the ADA4862-3.
The ADA4862-3 is another high performance triple current
feedback amplifier. The ADA4862-3 has integrated feedback
and gain set resistors that reduce board area and simplify designs.
+VS
10µF
0.1µF
–VS
10µF
0.1µF
+VS
10µF
0.1µF
–VS
10µF
0.1µF
75Ω
75Ω
GIN
21
22
19
24
RF
464Ω
75Ω
RG
464Ω
75Ω
RIN
PD1
3
2
4
PD2
PD3
1
+VS
10µF
0.1µF
75Ω
75Ω
BIN
GOU
14
23
5
T
ROUT
BOUT
–VS
10µF
0.1µF
6
16
17
15
18
13
RF
464Ω
RG
464Ω
20
RF
464Ω
RG
464Ω
AD8003
Figure 40. RGB Video Driver


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