AD8610ARM Analog Devices, AD8610ARM Datasheet - Page 11

• Manufacturer Part Number: AD8610ARM
• Description: Precision Very Low Noise Low Input Bias Current Wide Bandwith JFET Operational Amplifier
• Manufacturer: Analog Devices

TIME – 400ns/DIV
TIME – 400ns/DIV
TIME – 400ns/DIV
SR = 56V/ s
SR = 54V/ s
SR = 42.1V/ s
V
R
G = –1
G = –1
V
R
G = –1
V
R
S
L
S
S
L
L
=
= 2k
=
= 2k
=
= 2k
13V
13V
13V
The AD8610 has a very fast slew rate of 60 V/µs even when config-
ured in a noninverting gain of +1. This is the toughest condition
to impose on any amplifier since the input common-mode capaci-
tance of the amplifier generally makes its SR appear worse. The
slew rate of an amplifier varies according to the voltage difference
between its two inputs. To observe the maximum SR as specified in
the AD8610 data sheet, a difference voltage of about 2 V between the
inputs must be ensured. This will be required for virtually any JFET
op amp so that one side of the op amp input circuit is completely
off, maximizing the current available to charge and discharge the
internal compensation capacitance. Lower differential drive volt-
ages will produce lower slew rate readings. A JFET-input op amp
with a slew rate of 60 V/µs at unity gain with V
slew at 20 V/µs if it is operated at a gain of +100 with V
100 mV.
The slew rate of the AD8610 is double that of the OPA627 when
configured in a unity gain of +1 (see Figures 11 and 12).
The slew rate of an amplifier determines the maximum frequency
at which it can respond to a large signal input. This frequency
(known as full power bandwidth, or FPBW) can be calculated
from the equation:
for a given distortion (e.g., 1%).
FPBW
TIME – 400ns/DIV
TIME – 400ns/DIV
SR = 85V/ s
=
SR = 23V/ s
(
2π
×
SR
V
PEAK
)
IN
AD8610
= 10 V, might
V
R
G = +1
V
R
G = +1
S
L
S
L
=
= 2k
=
= 2k
IN
13V
13V
=