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SGM8541 Datasheet(PDF) 8 Page - SG Micro Corp

Part # SGM8541
Description  CMOS Operational Amplifiers
Download  18 Pages
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Manufacturer  SGMICRO [SG Micro Corp]
Direct Link  http://www.sg-micro.com
Logo SGMICRO - SG Micro Corp

SGM8541 Datasheet(HTML) 8 Page - SG Micro Corp

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1.1MHz, 46
μA, Rail-to-Rail I/O
SGM8541/2/4
CMOS Operational Amplifiers
8
MARCH 2017
SG Micro Corp
www.sg-
micro.com
APPLICATION NOTES
Driving Capacitive Loads
The SGM8541/2/4 can directly drive 250pF in
unity-gain without oscillation. The unity-gain follower
(buffer)
is
the
most
sensitive
configuration
to
capacitive loading. Direct capacitive loading reduces
the phase margin of amplifiers and this results in
ringing or even os
cillation. Applications that require
greater capacitive driving capability should use an
isolation
resistor
between
the
output
and
the
capacitive load like the circuit in Figure 1. The
isolation resistor RISO and the load capacitor CL form a
zero to increase stability. The bigger the RISO resistor
value, the more stable VOUT will be. Note that this
method results in a loss of gain accuracy because
RISO forms a voltage divider with the RLOAD.
VIN
VOUT
SGM8541
C
L
RISO
Figure 1
. Indirectly Driving Heavy Capacitive Load
An improved circuit is shown in Figure 2. It provides
DC accuracy as well as AC stability. RF provides the
DC accuracy by connecting the inverting signal with
the output.
C
F and R
ISO serve to counteract the loss of
phase
margin
by
feeding
the
high
frequency
component of the output signal back to the amplifier’s
inverting input, thereby preserving phase margin in
the overall feedback loop.
VIN
VOUT
SGM8541
C
L
RISO
RL
RF
C
F
Figure 2
. Indirectly Driving Heavy Capacitive Load with
DC Accuracy
For non-buffer configuration, there are two other ways
to increase the phase margin: (a) by increasing the
amplifier’s gain or (b) by placing a capacitor in parallel
with the feedback resistor to counteract the parasitic
capacitance associated with inverting node.
Power-Supply Bypassing and Layout
The SGM8541/2/4 family operates from either a
single +2.1V to +5.5V supply or dual ±1.05V to
±2.75V supplies. For single-supply operation, bypass
the power supply +VS with a 0.1µF ceramic capacitor
which should be placed close to the +VS pin. For
dual-supply operation, both the +VS and the -VS
supplies should be bypassed to ground with separate
0.1µF ceramic capacitors. 2.2µF tantalum capacitor
can be added for better performance.
SGM8541
+VS
Vn
Vp
-VS
VOUT
10
μF
0.1
μF
10
μF
0.1
μF
SGM8541
Vn
Vp
+VS
-VS(GND)
VOUT
10
μF
0.1
μF
Figure 3
. Amplifier with Bypass Capacitors


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