AD8510/AD8512/AD8513
SETTLING TIME
Settling time is the time it takes the output of the amplifier to
reach and remain within a percentage of its final value after a
pulse is applied at the input. The AD8510/AD8512/AD8513
settle to within 0.01% in less than 900 ns with a step of 0 V to
10 V in unity gain. This makes each of these parts an excellent
choice as a buffer at the output of DACs whose settling time is
typically less than 1 μs.
In addition to the fast settling time and fast slew rate, low offset
voltage drift and input offset current maintain the full accuracy
of 12-bit converters over the entire operating temperature range.
OUTPUT
+15V
V
SY
= ±15V
A
V
= –100
R
L
= 10kΩ
VOLTAGE
0V
INPUT
0V
–200mV
02729-054
OVERLOAD RECOVERY TIME
Overload recovery, also known as overdrive recovery, is the
time it takes the output of an amplifier to recover to its linear
region from a saturated condition. This recovery time is par-
ticularly important in applications where the amplifier must
amplify small signals in the presence of large transient voltages.
AD8512/AD8513. The output recovers in approximately 200 ns
from a saturated condition.
V
SY
= ±15V
V
IN
= 200mV
A
V
= –100
R
L
= 10kΩ
TIME (2µs/DIV)
Figure 44. Negative Overload Recovery
CAPACITIVE LOAD DRIVE
The AD8510/AD8512/AD8513 are unconditionally stable at all
gains in inverting and noninverting configurations. Each device
is capable of driving a capacitive load of up to 1000 pF without
oscillation in unity gain using the worst-case configuration.
However, as with most amplifiers, driving larger capacitive
loads in a unity gain configuration may cause excessive
overshoot and ringing, or even oscillation. A simple snubber
network significantly reduces the amount of overshoot and
ringing. The advantage of this configuration is that the output
swing of the amplifier is not reduced, because R
S
is outside the
feedback loop.
V+
OUTPUT
VOLTAGE
INPUT
0V
–15V
200mV
0V
02729-053
2
7
AD8510
200mV
3
4
6
V
OUT
R
S
C
S
C
L
02729-055
TIME (2µs/DIV)
Figure 43. Positive Overload Recovery
V–
The negative overdrive recovery time shown in Figure 44 is less
than 200 ns.
In addition to the fast recovery time, the AD8510/AD8512/
AD8513 show excellent symmetry of the positive and negative
recovery times. This is an important feature for transient signal
rectification because the output signal is kept equally undistorted
throughout any given period.
Figure 45. Snubber Network Configuration
Rev. H | Page 14 of 20
AD [ ANALOG DEVICES ]
