AD8061AR Analog Devices Inc, AD8061AR Datasheet - Page 15

• Manufacturer Part Number: AD8061AR
• Description: IC OPAMP VF R-R LP 50MA 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD8061AR

• Rohs Status: RoHS non-compliant
• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 650 V/µs
• -3db Bandwidth: 320MHz
• Current - Input Bias: 3.5µA
• Voltage - Input Offset: 1000µV
• Current - Supply: 6.8mA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 8 V, ±1.35 V ~ 4 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Gain Bandwidth Product: -

As the saturation point of the output stage is approached, the
output signal shows increasing amounts of compression and
clipping. As in the input headroom case, the higher frequency
signals require a bit more headroom than lower frequency
signals. Figure 16, Figure 17, and Figure 18 illustrate this point,
plotting typical distortion vs. output amplitude and bias for
gains of 2 and 5.
OVERLOAD BEHAVIOR AND RECOVERY
Input
The specified input common-mode voltage of the AD8061/
AD8062/AD8063 is −200 mV below the negative supply to
within 1.8 V of the positive supply. Exceeding the top limit
results in lower bandwidth and increased settling time as seen
in Figure 46 and Figure 47. Pushing the input voltage of a unity-
gain follower beyond 1.6 V within the positive supply leads to
the behavior shown in Figure 48—an increasing amount of
output error and much increased settling time. Recovery time
from input voltages 1.6 V or closer to the positive supply is
approximately 35 ns, which is limited by the settling artifacts
caused by transistors in the input stage coming out of saturation.
The AD8061/AD8062/AD8063 family does not exhibit phase
reversal, even for input voltages beyond the voltage supply rails.
Going more than 0.6 V beyond the power supplies turns on
protection diodes at the input stage, which greatly increases the
current draw of the device.
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
0
Figure 47. Output Rising Edge for 1 V Step at
Input Headroom Limits, G = 1, V
4
8
12
2V TO 3V STEP
TIME (ns)
16
2.1V TO 3.1V STEP
2.2V TO 3.2V STEP
20
2.3V TO 3.3V STEP
S
= 5 V, 0 V
2.4V TO 3.4V STEP
24
28
32
Rev. G | Page 15 of 20
Output
Output overload recovery is typically within 40 ns after the
amplifier’s input is brought to a nonoverloading value. Figure 49
shows output recovery transients for the amplifier recovering
from a saturated output from the top and bottom supplies to a
point at midsupply.
–0.2
5.0
4.6
4.2
3.8
3.4
3.0
2.6
2.2
1.8
1.4
1.0
0.6
0.2
3.7
3.5
3.3
3.1
2.9
2.7
2.5
2.3
2.1
0
0
INPUT VOLTAGE
Figure 49. Overload Recovery, G = −1, V
Figure 48. Pulse Response for G = 1 Follower,
VOLTAGE STEP
FROM 2.4V TO 3.4V
Input Step Overloading the Input Stage
10
100
EDGES
VOLTAGE STEP
FROM 2.4V TO 3.6V
20
200
AD8061/AD8062/AD8063
30
VOLTAGE STEP
FROM 2.4V TO 3.8V,
4V AND 5V
TIME (ns)
TIME (ns)
300
40
V
–
IN
400
2.5V
50
OUTPUT VOLTAGE
5V TO 2.5V
R
OUTPUT VOLTAGE
0V TO 2.5V
S
500
= 5 V
60
R
5V
600
70
V
O
–