MIC7201
Micrel
MIC7201
GainBlock鈩?Difference Amplifier
Preliminary Information
General Description
The MIC7201 difference amplifier is an analog gain block
designed to convert a differential signal to a signal-ended
signal. It features an extended common-mode range that
includes rail-to-rail input/output capabilities. The part is pack-
aged in the SOT-23-5 IttyBitty鈩?package.
The MIC7201 is designed using the MIC7101 operational
amplifier plus well-matched monolithic resistors to provide a
unity-gain stable differential input to signal-ended output
amplifier that requires a minimum of external components.
Performance is guaranteed from 2.2V through 10V.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Operates from 2.2V to 10V
鹵1%
typical gain error
0.6mA typical supply current at 2.2V
400kHz bandwidth
Small SOT-23-5 package
Suitable for driving capacitive loads
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cellular telephones
Digital audio systems
Mobile communications
Portable computers and PDAs
Ordering Information
Part Number
MIC7201BM5
Temperature Range
鈥?0擄C to +85擄C
Package
SOT-23-5
Other voltages available. Contact Micrel for details.
Block Diagram
V+
2
IN+
3
50k
100k
OUT
100k
1
V
IN鈥?/div>
V
IN+
IN鈥?/div>
4
50k
50k
MIC7201
V鈥?/div>
5
V
OUT
Difference Amplifier Behavior
The desired 100mV, 400Hz differential sinusoidal signal is shown applied to
inputs V
IN鈥?/div>
and V
IN+
. A 500mV, 5kHz square-wave 鈥渘oise鈥?signal is super-
imposed on both V
IN鈥?/div>
and V
IN+
.
These signals demonstrate the noise cancellation ability of the MIC7201.
The output (V
OUT
) shows the recovered single-ended 200mV peak-to-peak,
400Hz sine wave.
GainBlock is a trademark of Micrel, Inc.
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
December 1998
1
MIC7201
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