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PDF MAX44280 Data sheet ( Hoja de datos )
| Número de pieza | MAX44280 | |
| Descripción | Rail-to-Rail I/O Op Amp | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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www.DataSheet.co.kr
19-6157; Rev 0; 12/11
EVALUATION KIT AVAILABLE
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
General Description
The MAX44280 offers a unique combination of high
speed, precision, low noise, and low-voltage operation
making it ideally suited for a large number of signal pro-
cessing functions such as filtering and amplification of
signals in portable and industrial equipment.
The amplifier features an input offset of less than 50FV
and a high-gain bandwidth product of 50MHz while
maintaining a low 1.8V supply rail. The device is internally
compensated for gains of 5V/V or greater. The device’s
rail-to-rail input/outputs and low noise guarantee maxi-
mum dynamic range in demanding applications such
as 12- to 16-bit SAR ADC drivers. Unlike traditional
rail-to-rail input structures, input crossover distortion is
absent due to an optimized input stage with an ultra-quiet
charge pump.
The MAX44280 includes a fast-power-on shutdown mode
for further power savings.
The MAX44280 operates from a supply range of 1.8V to
5.5V over the -40NC to +125NC temperature range and
can operate down to 1.7V over the 0NC to +70NC tem-
perature range. The MAX44280 is available in a small,
6-pin SC70 package and is also available in a 1mm x
1.5mm thin µDFN (ultra-thin LGA) package.
Ordering Information appears at end of data sheet.
Features
S Low 1.8V Supply Rail Over the -40°C to +125°C
Range
S 1.7V Supply Rail Over the 0°C to +70°C Range
S 50MHz Bandwidth
S Low 12.7nV/√Hz Input Voltage-Noise Density
S Low 1.2fA/√Hz Input Current-Noise Density
S Low 50µV (max) VOS at +25°C
S 500fA Low Input Bias Current
S 750µA Quiescent Current per Amplifier
S < 1µA Supply Current in Shutdown
S Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin
µDFN Packages
S Low 110dB Total Harmonic Distortion
S 5V/V Minimum Stable Gain
Applications
Notebooks
3G/4G Handsets
Portable Media Players
Portable Medical Instruments
Battery-Operated Devices
Analog-to-Digital Converter Buffers
Transimpedance Amplifiers
General-Purpose Signal Processing
Typical Application Circuit
+3.3V
VSIG
2.4kI
MAX44280
10kI
3.3nF
ADC
MAX11645
24kI
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44280.related
����������������������������������������������������������������� Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
200
180
160
140
120
100
80
60
40
20
0
0.1
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 3.3V)
TA = +25°C
TA = +125°C
TA = -40°C
1 10
OUTPUT SINK CURRENT (mA)
100
200
180
160
140
120
100
80
60
40
20
0
0.1
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 5V)
TA = +25°C
TA = +125°C
TA = -40°C
1 10
OUTPUT SINK CURRENT (mA)
100
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 1.8V)
200
180
160
140 TA = +25°C
120
100
80
60 TA = +125°C
40 TA = -40°C
20
0
0.1
1 10
OUTPUT SOURCE CURRENT (mA)
100
200
180
160
140
120
100
80
60
40
20
0
0.1
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 3.3V)
TA = +25°C
TA = +125°C
TA = -40°C
1 10
OUTPUT SOURCE CURRENT (mA)
100
200
180
160
140
120
100
80
60
40
20
0
0.1
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 5V)
TA = +25°C
TA = +125°C
TA = -40°C
1 10
OUTPUT SOURCE CURRENT (mA)
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
900
850
TA = +25°C
800
TA = +125°C
750
700 TA = -40°C
650
600
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
����������������������������������������������������������������� Maxim Integrated Products 5
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5 Page 
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MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Applications Information
Power-Up Autotrim
The IC features an automatic trim that self-calibrates
the VOS of this device to less than 50FV of input offset
voltage on power-up. This self-calibration feature allows
the device to eliminate input offset voltage effects due
to power supply and operating temperature variation
simply by cycling its power. The autotrim sequence takes
approximately 10ms to complete and is triggered by an
internal power-on-reset (POR) circuitry. During this time,
the inputs and outputs are put into high impedance and
left unconnected.
Shutdown Operation
The MAX44280 features an active-low shutdown mode
that puts both inputs and outputs into high impedance
and substantially lowers the quiescent current to less
than 1FA. Putting the output into high impedance allows
multiple outputs to be multiplexed onto a single output
line without the additional external buffers. The device
does not self-calibrate when exiting shutdown mode
and retains its power-up trim settings. The device also
recovers from shutdown in under 30Fs.
The shutdown logic levels of the device is independent
of supply, allowing the shutdown feature of the device to
operate off of a 1.8V or 3.3V microcontroller, regardless
of supply voltage.
Rail-to-Rail Input/Output
The input voltage range of the IC extends 100mV above
VDD and below VSS. The wide input common-mode
voltage range allows the op amp to be used as a buf-
fer and as a differential amplifier in a wide-variety of
signal processing applications. Output voltage high/low
is designed to be only 50mV above VSS and below VDD
allowing maximum dynamic range in single-supply appli-
cations. The high output current and capacitance drive
capability of the device make it ideal as an ADC driver
and a line driver.
Input Bias Current
The IC features a high-impedance CMOS input stage
and a specialized ESD structure that allows low-input
bias current operation at low-input, common-mode volt-
ages. Low-input bias current is useful when interfacing
with high-ohmic sensors. It is also beneficial for design-
ing transimpedance amplifiers for photodiode sensors.
This makes the device ideal for ground-referenced medi-
cal and industrial sensor applications.
Active Filters
The MAX44280 is ideal for a wide variety of active filter
circuits that makes use of the wide bandwidth, rail-to-rail
input/output stages and high-impedance CMOS inputs.
Driver for Interfacing with
the MAX11645 ADC
The IC’s tiny size and low noise make it a good fit for driv-
ing 12- to 16-bit resolution ADCs in space-constrained
applications. The Typical Application Circuit shows the
MAX44280 amplifier output connected to a lowpass filter
driving the MAX11645 ADC. The MAX11645 is part of a
family of 3V and 5V, 12-bit and 10-bit, 2-channel ADCs.
The MAX11645 offers sample rates up to 94ksps and
measures two single-ended inputs or one differential
input. These ADCs dissipate 670FA at the maximum sam-
pling rate, but just 6FA at 1ksps and 0.5FA in shutdown.
Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and FMAX-
8 packages, the MAX11645 ADCs are an ideal fit to pair
with the MAX44280 amplifier in portable applications.
Where higher resolution is required, refer to the MAX1069
(14-bit) and MAX1169 (16-bit) ADC families.
���������������������������������������������������������������� Maxim Integrated Products 11
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| PDF Descargar | [ Datasheet MAX44280.PDF ] | |
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