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PDF MAX44250 Data sheet ( Hoja de datos )
| Número de pieza | MAX44250 | |
| Descripción | (MAX44250 - MAX44252) Low-Noise Op Amps | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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1. MAX44250  Hay una vista previa y un enlace de descarga de MAX44250 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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EVALUATION KIT AVAILABLE
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
General Description
The MAX44250/MAX44251/MAX44252 are 20V, ultra-
precision, low-noise, low-drift amplifiers that offer near-
zero DC offset and drift through the use of patented auto-
correlating zeroing techniques. This method constantly
measures and compensates the input offset, eliminating
drift over time and temperature and the effect of 1/f noise.
These single, dual, and quad devices feature rail-to-rail
outputs, operate from a single 2.7V to 20V supply, and
consume only 1.15mA per channel, while providing
5.9nV/√Hz input- referred voltage noise. The ICs are uni-
ty-gain stable with a gain-bandwidth product of 10MHz.
With excellent specifications such as offset voltage of
6µV (max), drift of 19nV/°C (max), and 123nVP-P noise in
0.1Hz to 10Hz, the ICs are ideally suited for applications
requiring ultra-low noise and DC precision such as inter-
facing with pressure sensors, strain gauges, precision
weight scales, and medical instrumentation.
The ICs are available in 5-pin SOT23, 8-pin SOT23,
8-pin µMAXM, and 14-pin SO packages and are rated
over the -40°C to +125°C temperature range.
Ordering Information appears at end of data sheet.
Functional Diagrams appear at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegated.com/MAX44250.related.
Benefits and Features
S 2.7V to 20V Power-Supply Range
S Integrated EMI Filter
S 6µV Input Offset Voltage (max) at Room
Temperature
S TCVOS of 19nV/°C (max)
S Low 5.9nV/√Hz Input-Referred Voltage Noise
S 123nVP-P in 0.1Hz to 10Hz
S Fast 400ns Settling Time
S 10MHz Gain-Bandwidth Product
S Rail-to-Rail Output
S High Accuracy Enables Precision Signal Chain
Acquisition
Applications
Strain Gauges
Pressure Transducers
Medical Instrumentation
www.DataSheet.net/
Precision Instrumentation
Load Cell and Bridge Transducer Amplification
Typical Operating Circuit
3.3V
20V
MAX44251
BUFFER
R
20V
R 20V
3V VOUT
R1 MAX6126
VDD
50RG
RG 50RG
R
BUFFER
VDD VREF
VIN+
MAX11211 OUTPUT
MICRO-
PROCESSOR
20V
BUFFER
MAX44251
R MAX44251
1.5V
VIN- VSS
C1
µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6000; Rev 2; 8/12
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 2)
PARAMETER
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
Gain-Bandwidth Product
Phase Margin
Slew Rate
Capacitive Loading
Total Harmonic Distortion
Settling Time
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
eN
iN
CIN
GBW
PM
SR
CL
THD
f = 1kHz
0.1Hz < f < 10Hz
f = 1kHz
CL = 20pF
AV = 1V/V, VOUT = 1VP-P, 10% to 90%
No sustained oscillation, AV = 1V/V
VOUT = 1VP-P,
AV = +1V/V,
VCM = VDD/4,
RL = 10kI to
VDD/2
f = 1kHz
f = 20kHz
To 0.01%, V = 1V step, A = -1V/VOUT
www.DataSheet.net/
V
6.2
123
0.3
2
10
60
5
500
-124
-100
200
nV/√Hz
nVP-P
pA/√Hz
pF
MHz
Degrees
V/Fs
pF
dB
ns
Note 2: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
Typical Operating Characteristics
(VDD = 10V, VSS = 0V, outputs have RL = 10kI to VDD/2. TA = +25NC, unless otherwise specified.)
OFFSET VOLTAGE HISTOGRAM
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
45
40
35
30
25
20
15
10
5
0
-0.001 0 0.001 0.002 0.003 0.004 0.005 0.006
OFFSET VOLTAGE DRIFT (µV/°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
1.4 TA = +125°C
TA = +85°C
1.2
1.0 TA = +25°C TA = 0°C
0.8 TA = -40°C
0.6
0.4
0.2
0
0
SUPPLY CURRENT
PER AMPLIFIER
5 10 15 20
SUPPLY VOLTAGE (V)
25
Maxim Integrated
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ADC Buffer Amplifier
The MAX44250/MAX44251/MAX44252's low input offset
voltage, low noise, and fast settling time make these
amplifiers ideal for ADC buffers. Weigh scales are one
application that often require a low-noise, high-voltage
amplifier in front of an ADC. Figure 1 details an example
of a load cell and amplifier driven from the same Q10V
supplies, along with the MAX11211 18-bit delta sigma
ADC. Load cells produce a very small voltage change at
their outputs, therefore driving the excitation source with
a higher voltage produces a wider dynamic range that
can be measured at the ADC inputs.
The MAX11211 ADC operates from a single 2.7V to 3.6V
analog supply, offers 18-bit noise-free resolution and
0.86mW power dissipation. The MAX11211 also offers
> 100dB rejection at 50Hz and 60Hz. This ADC is part of
a family of 16-, 18-, 20-, and 24-bit delta sigma ADCs with
high precision and < 1mW power dissipation.
The MAX44250/MAX44251/MAX44252's low input offset
voltage and low noise allow a gain circuit prior to the
MAX11211 without losing any dynamic range at the ADC.
Error Budget Example
When using the ICs as an ADC buffer in strain gauge
application, the temperature drift should be taken into
consideration to determine maximum input signal. A
typical strain gauge has sensitivity specification of just
2mV/V at rated out load. This means that when the strain
gauge load cell is powered with 10V, the full-scale output
voltage is 20mV. In this application, both offset voltage
and drift are critical parameters that directly affect the
accuracy of measurement. Even though offset voltage
could be calibrated out, its drift over temperature is still
a problem.
The ICs, with a typical offset drift of 5nV/°C, guarantee
that the drift over a 10°C range is only 50nV. Setting this
equal to 0.5 LSB in a 18-bit system yields a full-scale
range of 13mV. With a single 10V supply, an acceptable
closed-loop gain of 770V/V provides sufficient gain while
maintaining headroom.
Precision Low-Side Current Sensing
The ICs’ autozero feature produces ultra-low offset
voltage and drift, making them ideal for precision cur-
rent-sensing applications. Figure 2 shows the ICs in
a low-side current-sense configuration. This circuit pro-
duces an accurate output voltage, VOUT equal to ILOAD
x RSENSE x (1 + R2/R1).
VSUPPLY
www.DataSheet.net/
ILOAD
R1
RSENSE
R2
MAX44251
MAX44252
OUT
Figure 2. Low-Side Current Sensing
Maxim Integrated
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX44250.PDF ] | |
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