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AD8038AKS-R2 Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD8038AKS-R2
Spiegazioni elettronici  Low Power 350 MHz Voltage Feedback Amplifiers
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8038AKS-R2 Scheda tecnica(HTML) 10 Page - Analog Devices

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REV. F
–10–
AD8038/AD8039
The AD9203 works best when the common-mode voltage at the
input is at the midsupply or 2.5 V. The output stage design of
the AD8039 makes it ideal for driving these types of ADCs.
In this circuit, one of the op amps is configured in the inverting
mode, while the other is in the noninverting mode. However, to
provide better bandwidth matching, each op amp is configured
for a noise gain of +2. The inverting op amp is configured for a
gain of –1, while the noninverting op amp is configured for a
gain of +2. Each has a very similar ac response. The input signal
to the noninverting op amp is divided by 2 to normalize its
voltage level and make it equal to the inverting output.
The outputs of the op amps are centered at 2.5 V, which is the
midsupply level of the ADC. This is accomplished by first taking
the 2.5 V reference output of the ADC and dividing it by 2 with
a pair of 1 k
Ω resistors. The resulting 1.25 V is applied to each
op amp’s positive input. This voltage is then multiplied by the
gain of the op amps to provide a 2.5 V level at each output.
Low Power Active Video Filter
Some composite video signals derived from a digital source
contain clock feedthrough that can limit picture quality. Active
filters made from op amps can be used in this application, but
they will consume 25 mW to 30 mW for each channel. In
power-sensitive applications, this can be too much, requiring
the use of passive filters that can create impedance matching
problems when driving any significant load.
The AD8038 can be used to make an effective low-pass active
filter that consumes one-fifth of the power consumed by an
active filter made from an op amp. Figure 4 shows a circuit that
uses an AD8038 to create a single
±2.5 V supply, three-pole
Sallen-Key filter. This circuit uses a single RC pole in front of a
standard two-pole active section.
0.1 F
+2.5V
10 F
–2.5V
0.1 F
10 F
C3
33pF
R3
49.9
RF
1
680pF
R5
75
R2
499
C1
100pF
R1
200
R4
49.9
AD8038
VIN
VOUT
Figure 4. Low-Pass Filter for Video
Figure 5 shows the frequency response of this filter. The response
is down 3 dB at 6 MHz, so it passes the video band with little
attenuation. The rejection at 27 MHz is 45 dB, which provides
more than a factor of 100 in suppression of the clock components
at this frequency.
FREQUENCY – MHz
0.1
110
100
–10
10
0
–20
–30
–40
–50
–60
Figure 5. Video Filter Response


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