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PDF MAX44261 Data sheet ( Hoja de datos )
| Número de pieza | MAX44261 | |
| Descripción | (MAX44260 / MAX44261) Rail-to-Rail I/O Op Amps | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX44261 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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19-5873; Rev 2; 2/12
EVALUATION KIT AVAILABLE
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
General Description
The MAX44260/MAX44261 offer a unique combination of
high speed, precision, low noise, and low-voltage opera-
tion making them ideally suited for a large number of
signal processing functions such as filtering and ampli-
fication of signals in portable and industrial equipment.
The amplifiers feature an input offset of less than 50FV
and a high-gain bandwidth product of 15MHz while
maintaining a low 1.8V supply rail. The devices’ rail-to-
rail input/outputs and low noise guarantee maximum
dynamic range in demanding applications such as 12- to
14-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 MAX44260 includes a fast-power-on shutdown mode
for further power savings. The MAX44261 offers a unique
on-demand calibration pin where the user can invoke
self-trimming of the input offset voltage.
The family of parts 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 MAX44260/MAX44261 are available
in small, 6-pin SC70 packages. The MAX44260 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
1.7V Supply Rail Over the 0°C to +70°C Range
S 15MHz Unity-Gain 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 On-Demand VOS Self-Calibration (MAX44261)
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 (MAX44260) Packages
S Low 110dB Total Harmonic Distortion
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
2.4kI
22kI
330pF
15nF
+3.3V
MAX44260
10kI
3.3nF
ADC
MAX11645
CORNER FREQUENCY = 10kHz
SALLEN-KEY FILTER
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44260.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.
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1 page  
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MAX44260 / MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = 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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MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Applications Information
Power-Up Autotrim
The ICs feature an automatic trim that self-calibrates the
VOS of these devices 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. The MAX44261 can also be forced into
a self-calibration cycle by pulling the CAL input low for
1µs. This input also puts the part into shutdown mode.
Shutdown Operation
The MAX44260 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. Figure 3 shows
that the device also recovers from shutdown in under
30Fs.
The MAX44261 features a recalibrate input that acts the
same as the shutdown mode of the MAX44260. However,
when the input is pulled low, the device goes through a
self-calibration sequence again (Figure 3).
The shutdown logic levels of the devices are indepen-
dent 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 ICs extends 100mV
above VDD and below VSS. The wide input common-
mode voltage range allows the op amp to be used as
a buffer 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
applications. The high output current and capacitance
drive capability of the devices make them ideal as an
ADC driver and a line driver.
VDD
VSHDN/VCAL
0V
VDD/2
MAX44260
OUTPUT
0V
VDD/2
MAX44261
OUTPUT
FAST RECOVERY
AMPLIFIER
ACTIVE
AUTOTRIM
SEQUENCE
RECALIBRATED
AMPLIFIER
ACTIVE
0V
30µs
10ms
Figure 3. CAL vs. SHDN Input Operation.
���������������������������������������������������������������� Maxim Integrated Products 11
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX44261.PDF ] | |
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