AD8003ACPZ-R2(RevA) Просмотр технического описания (PDF) - Analog Devices
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AD8003ACPZ-R2 Datasheet PDF : 16 Pages
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AD8003
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
−1
RF (Ω)
300
RG (Ω)
300
RS (Ω)
0
−3 dB
SS BW
(MHz)
734
Large
Signal
−3 dB
BW
668
Large
Signal
0.1 dB
BW
--
+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.
+VS
10µF
RF
0.1µF
RG
FB
–
+V
VIN
RS
AD8003
+
VO
–V 0.1µF
VO
RL
10µF
–VS
Figure 38. Noninverting Gain
+VS
10µF
RF
0.1µF
RG
FB
VIN
–
+V
AD8003
+
VO
–V 0.1µF
VO
RL
10µF
–VS
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.
RIN
75Ω
PD3
PD2
PD1
5 23 14
4
RG
3
464Ω
RF
464Ω
2
+VS
10µF
1
0.1µF
75Ω
–VS
10µF
6
0.1µF
ROUT
AD8003
+VS
10µF
19
0.1µF
GIN
22
75Ω
RG
21
464Ω
RF
464Ω
20
75Ω
–VS
10µF
24
0.1µF
GOUT
+VS
10µF
18
0.1µF
BIN
15
75Ω
RG
16
464Ω
RF
464Ω
17
75Ω
–VS
10µF
13
0.1µF
BOUT
Figure 40. RGB Video Driver
Rev. A | Page 12 of 16
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