AD8003 Analog Devices, AD8003 Datasheet - Page 12

• Manufacturer Part Number: AD8003
• Description: Triple, 1.5 GHz Op Amp
• Manufacturer: Analog Devices

Specifications of AD8003

• -3db Bandwidth: 1.65GHz
• Slew Rate: 3800V/µs
• Vos: 700µV
• Ib: 7µA
• # Opamps Per Pkg: 3
• Input Noise (nv/rthz): 1.8nV/rtHz
• Vcc-vee: 4.5V to 10V
• Isy Per Amplifier: 10.2mA
• Packages: CSP

AD8003
APPLICATIONS INFORMATION
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 Response
Gain
−1
+1
+2
+5
+10
1
Figure 38 and Figure 39 show the typical noninverting and inverting
configurations and recommended bypass capacitor values.
Conditions: V
R
300
432
464
300
300
F
(Ω)
V
V
S
IN
IN
= ±5 V, T
R
300
N/A
464
75
33.2
G
R
R
R
(Ω)
A
G
S
G
Figure 38. Noninverting Gain
= 25°C, R
Figure 39. Inverting Gain
R
0
24.9
0
0
0
R
R
S
F
–
AD8003
+
–
+
F
AD8003
(Ω)
L
= 150 Ω.
–V
–V
FB
–V
FB
–V
S
S
+V
10µF
+V
10µF
0.1µF
0.1µF
S
+V
−3 dB
SS BW
(MHz)
734
1650
761
567
446
S
+V
0.1µF
0.1µF
10µF
10µF
V
V
O
O
Large
Signal
−3 dB
BW
668
822
730
558
422
R
R
L
L
V
V
Large
Signal
0.1 dB
BW
--
--
190
165
170
O
O
1
Rev. B | Page 12 of 16
RGB VIDEO DRIVER
Figure 40 shows a typical RGB driver application using bipolar
supplies. The gain of the amplifier is set at +2, where R
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
feedback amplifier. The
and gain set resistors that reduce board area and simplify designs.
R
G
B
IN
IN
IN
75Ω
ADA4862-3
75Ω
75Ω
464Ω
464Ω
464Ω
464Ω
464Ω
464Ω
R
R
R
R
R
R
G
G
G
F
F
F
PD3
PD2
PD1
is another high performance triple current
22
21
20
15
16
17
4
3
2
Figure 40. RGB Video Driver
5
AD8003
ADA4862-3
23
14
13
19
18
1
6
has integrated feedback
0.1µF
0.1µF
0.1µF
0.1µF
10µF
10µF
10µF
0.1µF
10µF
0.1µF
10µF
10µF
–V
–V
+V
+V
+V
–V
S
S
S
S
S
S
75Ω
75Ω
75Ω
F
= R
G
R
G
B
=
OUT
OUT
OU
T