MAX9916 Maxim, MAX9916 Datasheet - Page 10

• Manufacturer Part Number: MAX9916
• Description: The single MAX9914/MAX9915 and dual MAX9916/MAX9917 operational amplifiers feature maximized ratio of gain bandwidth to supply current and are ideal for battery-powered applications such as portable instrumentation, portable medical equipment, and wi
• Manufacturer: Maxim

1MHz, 20µA, Rail-to-Rail I/O Op Amps
with Shutdown
The MAX9914–MAX9917 are optimized for single 1.8V
to 5.5V supply operation. A high amplifier power-supply
rejection ratio of 85dB (typ) allows the devices to be
powered directly from a battery, simplifying design and
extending battery life.
The MAX9914–MAX9917 typically require 2µs after
power-up. Supply settling time depends on the supply
voltage, the value of the bypass capacitor, the output
impedance of the incoming supply, and any lead resis-
tance or inductance between components. Op amp
settling time depends primarily on the output voltage
and is slew-rate limited. Figure 3 shows the MAX991_ in
a noninverting voltage follower configuration with the
input held at midsupply. The output settles in approxi-
mately 3.5µs for V
Characteristics for the Power-Up Settling Time graph).
The MAX9915 and MAX9917 feature active-low shut-
down inputs. The MAX9915 and MAX9917 enter shut-
down in 2µs (typ) and exit shutdown in 10µs (typ). The
amplifiers’ outputs are high impedance in shutdown
mode. Drive SHDN low to enter shutdown. Drive SHDN
high to enable the amplifier. The MAX9917 dual amplifi-
er features separate shutdown inputs. Shut down both
amplifiers for lowest quiescent current.
Bypass V
to the pin as possible to minimize noise.
Good layout techniques optimize performance by
decreasing the amount of stray capacitance and induc-
tance to the op amp’s inputs and outputs. Minimize
stray capacitance and inductance, by placing external
components close to the IC.
10
______________________________________________________________________________________
Power-Supply Bypassing and Layout
DD
with a 0.1µF capacitor to ground as close
Power-Supply Considerations
DD
= 3V (see the Typical Operating
Power-Up Settling Time
Shutdown Mode
Figure 1. Rail-to-Rail Output Voltage Range
Figure 2. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
Figure 3. Power-Up Test Configuration
0V
3V
0V
3V
0V
RAIL-TO-RAIL OUTPUT VOLTAGE RANGE
5.5V
MAX9914–
MAX9917
V
DD
= 3V
100k
100k
200 s/div
IN+
IN-
R
ISO
MAX991_
A
V
=
V
V
DD
SS
R
L
R
L
+ R
R
L
ISO
IN_
1V/div
OUT_
1V/div
C
1V/V
L
OUT