AD8000 Analog Devices, AD8000 Datasheet - Page 14

• Manufacturer Part Number: AD8000
• Description: 1.5 GHz, Ultra-High Speed Op Amp with Power-Down
• Manufacturer: Analog Devices

Specifications of AD8000

• -3db Bandwidth: 1580MHz
• Slew Rate: 4100V/µs
• Vos: 1mV
• Ib: 5µA
• # Opamps Per Pkg: 1
• Input Noise (nv/rthz): 1.6nV/rtHz
• Vcc-vee: 4.5V to 12V
• Isy Per Amplifier: 14.3mA
• Packages: CSP,SOIC

AD8000
APPLICATIONS
All current feedback amplifier operational amplifiers are
affected by stray capacitance at the inverting input pin. As a
practical consideration, the higher the stray capacitance on
the inverting input to ground, the higher R
minimize peaking and ringing.
CIRCUIT CONFIGURATIONS
Figure 50 and Figure 51 show typical schematics for non-
inverting and inverting configurations. For current feedback
amplifiers, the value of feedback resistance determines the
stability and bandwidth of the amplifier. The optimum
performance values are shown in Table 5 and should not be
deviated from by more than ±10% to ensure stable operation.
Figure 8 shows the influence varying R
noninverting unity-gain configurations, it is recommended that
an R
Table 5 provides a quick reference for the circuit values, gain,
and output voltage noise.
Table 5. Typical Values (LFCSP/SOIC)
Gain
1
2
4
10
S
of 50 Ω be used, as shown in Figure 50.
V
IN
Component
Values (Ω)
R
432
432
357
357
F
R
R
Figure 50. Noninverting Configuration
G
S
R
---
432
120
40
G
R
NONINVERTING
–
+
F
AD8000
–V
−3 dB SS
Bandwidth
(MHz)
LFCSP
1380
600
550
350
FB
–V
S
+V
10μF
0.1μF
S
+V
+
0.1μF
10μF
+
V
O
F
has on bandwidth. In
SOIC
1580
650
550
365
F
needs to be to
R
L
−3 dB LS
Bandwidth
(MHz)
LFCSP
550
610
350
370
V
O
Rev. A | Page 14 of 20
SOIC
600
650
350
370
VIDEO LINE DRIVER
The AD8000 is designed to offer outstanding performance as a
video line driver. The important specifications of differential
gain (0.02%), differential phase (0.01°), and 650 MHz band-
width at 2 V p-p meet the most exacting video demands. Figure 52
shows a typical noninverting video driver with a gain of +2.
Slew Rate
(V/μsec)
2200
3700
3800
3200
V
IN
V
CABLE
IN
75Ω
432Ω
75Ω
R
Output Noise
(nV/√Hz)
10.9
11.3
10
18.4
G
Figure 51. Inverting Configuration
432Ω
Figure 52. Video Line Driver
AD8000
+
R
FB
–
+
AD8000
F
–V
+V
S
–V
S
–V
FB
S
0.1μF
4.7μF
+V
10μF
0.1μF
+
0.1μF
4.7μF
S
+V
+
+
0.1μF
10μF
+
V
O
Total Output
Noise Including
Resistors (nV/√Hz)
11.2
11.9
12
19.9
75Ω
CABLE
75Ω
R
L
75Ω
V
O
V
OUT