CMV7106YR Ver la hoja de datos (PDF) - California Micro Devices Corp
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CMV7106YR Datasheet PDF : 9 Pages
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CALIFORNIA MICRO DEVICES
CMV7106
Applications Benefits
1.0 Packaging
The most obvious benefit to using the CMV7106 is the
SOT package, which has been widely accepted as the
surface mounting of choice. The SOT23 footprint not only
saves space on the PCB but also provides a low profile
for applications such as the PCMCIA, type III cards
which require heights less than 0.056 Inches (1.43mm).
1.2 Signal Integrity
As systems have become smaller and higher functional-
ity is demanded of them, spacing between traces has
diminished as well. This can result in increased sensitiv-
ity to noise, pick-up, and cross talk. Due to its small size,
the CMV7106 may be placed in close proximity to the
signal source minimizing the above problems, and since
it is a single device, routing traces to a multiple amplifier
such as dual or quad avoids running long traces reduc-
ing cross talk.
The Rail to Rail Inputs and Output allow the amplifier to
operate on a low supply voltages while maintaining
signal tracking integrity and large output voltage swings
(relative to the supply rail).
1.3 Low Distortion
Even when operated from a 2.2 volt supply, the
CMV7106 still exhibits very low distortion thanks to its
large open loop gain and unique circuit design making it
suitable for application in many audio systems.
1.4 Low Supply Current and High Output Current
The supply current required by CMV7106 of 300µA
coupled with its ability to sink and source large currents
of 50mA make it unique in its class. Clearly, the low
supply current provides longer operation in battery
operated systems while the high output current assures
that circuits with capacitive loads will “starter” faster. The
high output current also eliminates the need for a buffer,
such as an emitter follower, in the loop with the amplifier
for applications demanding large load currents.
1.5 Shutdown Operation
Compared to a typical SOT Amp, an additional pin,
Shutdown is included to control the “idle” mode of the
amplifier. Shutdown allows the amplifier to be placed in a
very low power consumption mode, reducing the power
consumption mode (< 3 µW at 3 Volt supply) by reducing
the supply current to less than 1µA.
To use the Shutdown feature, a logic level is connected
to the Shutdown pin (pin1), which is configured as a
digital input (Logic “1” turns the amplifier on). This makes
the input directly compatible with common logic families.
If the Shutdown feature is not desired, the pin should be
shorted to V+ (pin 4).
1.6 Turn On and Turn Off (Shutdown) Characteristics
The turn off delay, t , is defined as the time between the
off
Shutdown signal crossing the disable threshold (typically
V+ – 1.0V) and the time for the amplifier’s output to
come within 10% of the its final value. It is largely
governed by a propagation delay within the CMV7106 of
a few hundred nanoseconds followed by an exponential
decay determined by the load resistance in parallel with
the load capacitance. See Typical Performance Charac-
teristics.
The turn on delay, ton, is defined as the time between the
Shutdown signal crossing the threshold and the time that
the output reaches to within 10% of its final See Typical
Performance Characteristics.
Applications Information
2.0 Input Common Mode and Output Voltage Consid-
erations
The CMV7106 will accommodate input common mode
voltages equal to both rails, and input signals that
exceed the rails will not cause phase inversion of the
output. However, ESD diode clamps are provided at the
inputs that can be damaged if currents in excess of 5mA
when the input voltage exceeds the rail by 0.3 volt.
Damage can be precluded by inserting a limiting resistor,
Rs, in series with the input whose recommend value may
be calculated from:
RS
>
VIN
–
(V+ –0.3V)
5mA
(1)
For V+ equal to 2.2 volts, and Vin equal to a maximum of
5 volts, Rs should be chosen for a value of 500Ω or
greater. The Shutdown pin also provides ESD clamp
diodes that will be damaged if the signal should be
limited to < 5mA by inserting the appropriate resistor
between the input signal or logic gate and the Shutdown
input.
2.1 Output Current and Power Dissipation
The CMV7106 is capable of sinking or sourcing output
currents in excess of 50mA and voltages nearly equal to
the supply voltage. The device does not have internal
short circuit limiting, but it is capable of withstanding an
indefinite short circuit without sustaining damage.
Clearly the maximum power dissipation will occur under
these conditions:
Pdiss = (V+ –Vout) * Iout
(2)
Where: Pdiss = Power dissipated by the chip
V+ = Supply Voltage
Vout = The Output Voltage
© 2000 California Micro Devices Corp. All rights reserved.
9/27/2000 215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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