AD8057ARZ Analog Devices Inc, AD8057ARZ Datasheet - Page 13

IC OPAMP VF LN LP LDIST 8SOIC

AD8057ARZ

Manufacturer Part Number
AD8057ARZ
Description
IC OPAMP VF LN LP LDIST 8SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8057ARZ

Slew Rate
1150 V/µs
Amplifier Type
Voltage Feedback
Number Of Circuits
1
-3db Bandwidth
325MHz
Current - Input Bias
500nA
Voltage - Input Offset
1000µV
Current - Supply
6mA
Voltage - Supply, Single/dual (±)
3 V ~ 12 V, ±1.5 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Op Amp Type
Voltage Feedback
No. Of Amplifiers
1
Bandwidth
325MHz
Supply Voltage Range
3V To 12V
Amplifier Case Style
SOIC
No. Of Pins
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Current - Output / Channel
-
Gain Bandwidth Product
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

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Manufacturer
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APPLICATIONS INFORMATION
DRIVING CAPACITIVE LOADS
When driving a capacitive load, most op amps exhibit overshoot in
their pulse response. Figure 43 shows the relationship between
the capacitive load that results in 30% overshoot and the closed-
loop gain of an AD8058. It can be seen that, under the gain = +2
condition, the device is stable with capacitive loads of up to 69 pF.
In general, to minimize peaking or to ensure device stability for
larger values of capacitive loads, a small series resistor (R
be added between the op amp output and the load capacitor
(C
For the setup shown in Figure 44, the relationship between R
and C
L
) as shown in Figure 44.
V
IN
L
500
400
300
200
100
= 200mV p-p
was empirically derived and is shown in Table 4.
0
1
Figure 43. Capacitive Load Drive vs. Closed-Loop Gain
R
G
Figure 44. Capacitive Load Drive Circuit
2
R
S
AD8058
= 2.4Ω
CLOSED-LOOP GAIN
R
+2.5V
–2.5V
S
= 0Ω
0.1µF
0.1µF
3
R
10µF
F
10µF
R
4
S
FET PROBE
C
L
V
OUT
S
5
) can
Rev. C | Page 13 of 16
S
Table 4. Recommended Value for Resistors R
Capacitive Load, C
Gain
1
2
3
4
5
10
VIDEO FILTER
Some composite video signals that are derived from a digital
source contain some clock feedthrough that can cause problems
with downstream circuitry. This clock feedthrough is usually at
27 MHz, which is a standard clock frequency for both NTSC
and PAL video systems. A filter that passes the video band and
rejects frequencies at 27 MHz can be used to remove these fre-
quencies from the video signal.
Figure 46 shows a circuit that uses an AD8057 to create a single
5 V supply, 3-pole Sallen-Key filter. This circuit uses a single RC
pole in front of a standard 2-pole active section. To shift the dc
operating point to midsupply, ac coupling is provided by R4, R5,
and C4.
Figure 45. Typical Pulse Response with C
200Ω
R1
–100mV
–200mV
200mV
100mV
R
100 Ω
100 Ω
100 Ω
100 Ω
100 Ω
100 Ω
C1
100pF
499Ω
R2
F
100mV/DIV
49.9Ω
R3
Figure 46. Low-Pass Filter for Video
R
100 Ω
50 Ω
33.2 Ω
25 Ω
11 Ω
L
, Which Results in 30% Overshoot
G
C3
36pF
0.1µF
C4
+5V
C
11 pF
51 pF
104 pF
186 pF
245 pF
870 pF
50ns/DIV
L
R4
10kΩ
R5
10kΩ
(R
S
L
= 65 pF, Gain = +2, and V
= 0 Ω)
2
3
680pF
AD8057/AD8058
C2
AD8057
+5V
7
4
+OVERSHOOT
29.0%
1kΩ
0.1µF
S
C
13 pF
69 pF
153 pF
270 pF
500 pF
1580 pF
R
, R
F
6
L
(R
F
, R
S
= 2.4 Ω)
+
10µF
G
vs.
S
= ±2.5

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