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AD8041AR Datenblatt(PDF) 12 Page - Analog Devices

Teile-Nr. AD8041AR
Beschreibung  160 MHz Rail-to-Rail Amplifier with Disable
Download  16 Pages
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Hersteller  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8041AR Datenblatt(HTML) 12 Page - Analog Devices

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REV. B
–12–
AD8041
R2
C3
gm2
VOUT
R1
C9
gmVi
S1N
S1P
C7
R1
gmVi
Figure 6. Small Signal Schematic
Disable Operation
The AD8041 has an active-low disable pin, which can be used
to three-state the output of the part and also lower its supply
current. If the disable pin is left floating, the part is enabled and
will perform normally. If the disable pin is pulled to 2.5 V (min)
below the positive supply, output of the AD8041 will be disabled
and the nominal supply current will drop to less than 1.6 mA.
For best isolation, the disable pin should be pulled to as low a
voltage as possible; ideally, the negative supply rail.
The disable pin on the AD8041 allows it to be configured as a 2:1
mux as shown in Figure 7 and can be used to switch many types of
high speed signals. Higher order multiplexers can also be built.
The break-before-make switching time is approximately 50 ns to
disable the output and 300 ns to enable the output.
6
4
7
3
2
AD8041
330
50
10 F
5V
330
8
6
4
7
3
2
AD8041
330
50
10 F
5V
330
8
13
12
11
10
74HC04
50
G = +2
G = +2
CH0
5MHz
CH1
10MHz
Figure 7. 2:1 Multiplexer
10
0%
100
90
200ns
1V
VS = 5V
Figure 8. 2:1 Multiplexer Performance
Single-Supply A/D Conversion
Figure 9 shows the AD8041 driving the analog inputs of the
AD9050 in a dc-coupled system with single-ended signals. All
components are powered from a single 5 V supply. The AD820
is used to offset the ground referenced input signal to the level
required by the AD9050. The AD8041 is used to add in the offset
with the ground referenced input signal and buffer the input to
AD9050. The nominal input range of the AD9050 is 2.8 V
and 3.8 V (1 V p-p centered at 3.3 V). This circuit provides
40 MSPS analog-to-digital conversion on just 330 mW of power
while delivering 10-bit performance.
0.1 F
5V
AD8041
2.8V – 3.8V
3.3V
5V
AD9050
10
9
1k
VIN
–0.5V TO +0.5V
1k
1k
0.1 F
5V
AD820
1k
Figure 9. 10-Bit, 40 MSPS A/D Conversion
0
–10
–100
–60
–70
–80
–90
–40
–50
–30
–20
F1 = 4.9MHz
FUNDAMENTAL = 0.6dB
SECOND HARMONIC = 66.9dB
THIRD HARMONIC = 74.7dB
SNR = 55.2dB
NOISE FLOOR = – 86.1dB
ENCODE FREQUENCY = 40MHz
Figure 10. FFT Output of Circuit in Figure 9


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