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PDF MAX44251 Data sheet ( Hoja de datos )
| Número de pieza | MAX44251 | |
| Descripción | (MAX44251 / MAX44252) Low-Noise Op Amps | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-6000; Rev 0; 10/11
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
General Description
The MAX44251/MAX44252 are 20V, ultra-precision, low-
noise, low-drift amplifiers that offer near-zero DC offset
and drift through the use of patented autocorrelating
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
dual and quad devices feature rail-to-rail outputs, oper-
ate 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 unity-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 8-pin SOT23, 8-pin µMAXM,
and 14-pin SOIC 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.maxim-ic.com/MAX44251.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
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.
����������������������������������������������������������������� 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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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 +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Phase Margin
Slew Rate
Capacitive Loading
PM CL = 20pF
SR AV = 1V/V, VOUT = 1VP-P, 10% to 90%
CL No sustained oscillation, AV = 1V/V
60
5
500
Total Harmonic Distortion
THD
VOUT = 1VP-P,
AV = +1V/V,
VCM = VDD/4,
RL = 10kI to
VDD/2
f = 1kHz
f = 20kHz
-124
-100
Settling Time
To 0.01%, VOUT = 1V step, AV = -1V/V
200
Note 2: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
UNITS
Degrees
V/Fs
pF
dB
ns
Typical Operating Characteristics
(VDD = 10V, VSS = 0V, outputs have RL = 10kI to VDD/2. TA = +25NC, unless otherwise specified.)
OFFSET VOLTAGE HISTOGRAM
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
OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
16
14
12
10
8
6
4
2
0
-0.001 0.001 0.003 0.005
0 0.002 0.004 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 Products 5
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MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
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 R2/R1.
PROCESS: BiCMOS
Chip Information
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX44251AKA+
MAX44251AUA+
MAX44252ASD+*
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
8 SOT23
8 FMAX
14 SOIC
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
TOP
MARK
AERC
—
—
Functional Diagrams
TOP VIEW
+
OUTA 1
INA- 2
INA+ 3
VSS 4
MAX44251
8 VDD
7 OUTB
6 INB-
5 INB+
VSUPPLY
ILOAD
R1
RSENSE
R2
OUT
MAX44251
MAX44252
Figure 2. Low-Side Current Sensing
+
OUTA 1
INA- 2
INA+ 3
VDD 4
INB+ 5
INB- 6
OUTB 7
MAX44252
14 OUTD
13 IND-
12 IND+
11 VSS
10 INC+
9 INC-
8 OUTC
���������������������������������������������������������������� Maxim Integrated Products 11
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX44251.PDF ] | |
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