mc33102p ON Semiconductor, mc33102p Datasheet - Page 12

• Manufacturer Part Number: mc33102p
• Description: Dual Sleep-mode Operational Amplifier
• Manufacturer: ON Semiconductor

where high performance (which requires higher current
drain) is required only part of the time. The two−state feature
of this op amp enables it to conserve power during idle times,
yet be powered up and ready for an input signal. Possible
applications include laptop computers, automotive, cordless
phones, baby monitors, and battery operated test equipment.
Although most applications will require low power
consumption, this device can be used in any application
where better efficiency and higher performance is needed.
and an awakemode. In the sleepmode state, the amplifier is
active and functions as a typical micropower op amp. When
a signal is applied to the amplifier causing it to source or sink
sufficient current (see Figure 13), the amplifier will
automatically switch to the awakemode. See Figures 20 and
21 for transition times with 600 Ω and 10 kΩ loads.
voltages as low as V
voltage, the output voltage swing will be limited to a few
hundred millivolts.) The input voltages must range between
V
rating table. Specifically, allowing the input to go more
negative than 0.3 V below V
damage. Also, exceeding the input common mode voltage
range on either input may cause phase reversal, even if the
inputs are between V
operate in the awakemode. This is because of the currents
generated due to charging of internal capacitors. When this
occurs and the sleepmode state is desired, the user will have
to wait approximately 1.5 seconds before the device will
switch back to the sleepmode. To prevent this from
occurring, ramp the power supplies from 1.0 V to full
supply. Notice that the device is more prone to switch into
the awakemode when V
change in V
CC
The MC33102 was designed primarily for applications
The Sleep−Mode™ amplifier has two states; a sleepmode
The MC33102 will begin to function at power supply
When power is initially applied, the part may start to
and V
Figure 37. Sleepmode Small Signal
EE
CC
supply voltages as shown in the maximum
.
Transient Response
S
CC
= ±1.0 V at room temperature. (At this
t, TIME (50 μs/DIV)
and V
EE
is adjusted than with a similar
EE
.
EE
may cause product
APPLICATIONS INFORMATION
R
C
L
L
=
= 0 pF
CIRCUIT INFORMATION
R
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high slew rate, gain bandwidth, and output current
capability. In the awakemode, this amplifier can drive 27
Vpp into a 600 Ω load with V
from returning to the sleepmode at every zero crossing. This
delay circuit also eliminates the crossover distortion
commonly found in micropower amplifiers. This amplifier
can process frequencies as low as 1.0 Hz without the
amplifier returning to sleepmode, depending on the load.
noise performance in both the sleep and awake modes, and
an all NPN output stage provides symmetrical source and
sink AC frequency response.
awakemode whenever the output current exceeds a preset
current threshold (I
the output switching threshold voltage (V
the output loading resistance (R
resistor, feedback resistors, or both. Then:
to switch, but reduce unwanted transitions to the
awakemode. For instance, in cases where the amplifier is
connected with a large closed loop gain (A
offset voltage (V
and could produce an output voltage exceeding V
input signal applied.
because most of the transition time is consumed slewing in
the sleepmode until V
output switching threshold voltage V
The awakemode uses higher drain current to provide a
An internal delay circuit is used to prevent the amplifier
The first stage PNP differential amplifier provides low
The amplifier is designed to switch from sleepmode to
Large valued load resistors require a large output voltage
Small values of R
Figure 38. Awakemode Small Signal
IO
TH
L
V
) is multiplied by the gain at the output
ST
allow rapid transition to the awakemode
) of approximately 160 μA. As a result,
ST
Transient Response
= (160 μA) × R
is reached (see Figures 20, 21). The
t, TIME (50 μs/DIV)
L
S
). This loading can be a load
= ±15 V.
ST
L
is higher for larger
ST
) is controlled by
CL
R
C
L
L
), the input
= 600 Ω
= 0 pF
ST
with no