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PDF MAX44244 Data sheet ( Hoja de datos )
| Número de pieza | MAX44244 | |
| Descripción | Single/Quad/Dual Op Amps | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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1. MAX44244  Hay una vista previa y un enlace de descarga de MAX44244 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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EVALUATION KIT AVAILABLE
MAX44244/MAX44245/MAX44248
36V, Precision, Low-Power, 90µA,
Single/Quad/Dual Op Amps
General Description
The MAX44244/MAX44245/MAX44248 family of parts
provide ultra-precision, low-noise, zero-drift single/quad/
dual operational amplifiers featuring very low-power
operation with a wide supply range. The devices incor-
porate a patented auto-zero circuit that constantly mea-
sures and compensates the input offset to eliminate drift
over time and temperature as well as the effect of 1/f
noise. These devices also feature integrated EMI filters
to reduce high-frequency signal demodulation on the
output. The op amps operate from either a single 2.7V to
36V supply or dual ±1.35V to ±18V supply. The devices
are unity-gain stable with a 1MHz gain-bandwidth prod-
uct and a low 90µA supply current per amplifier.
The low offset and noise specifications and high supply
range make the devices ideal for sensor interfaces and
transmitters.
The devices are available in FMAXM, SO, SOT23, and
TSSOP packages and are specified over the -40NC to
+125NC automotive operating temperature range.
Applications
Sensors Interfaces
4-20mA and 0 to10V Transmitters
PLC Analog I/O Modules
Weight Scales
Portable Medical Devices
Features
S Very Low Input Voltage Offset 7.5µV (max)
S Low 30nV/NC Offset Drift (max)
S Low 90µA Quiescent Current per Amplifier
S Low Input Noise
50nV/√Hz at 1kHz
0.5µVP-P from 0.1Hz to 10Hz
S 1MHz Gain-Bandwidth Product
S EMI Suppression Circuitry
S Rail-to-Rail Output
S 2.7V to 36V Supply Range
S µMAX, SO, SOT23, TSSOP packages
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX44244.related.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
MAX6033
REF
MAX5216
DAC
VREF
R1
R2
R3
MAX44244
LP+
ISIG
(4-20mA)
RSENSE
LP-
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6367; Rev 1; 6/13
1 page  
MAX44244/MAX44245/MAX44248
36V, Precision, Low-Power, 90µA,
Single/Quad/Dual Op Amps
Typical Operating Characteristics
(TVADD==+2150°VC, ,VuSnSle=ss0Vo,thVeINrw+is=eVnIoNt-e=d.V) DD/2, RL = 5kω to VDD/2. Typical values are at TA = +25°C.)
INPUT OFFSET VOLTAGE HISTOGRAM
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
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE DRIFT
35
30
25
20
15
10
5
0
4 5 6 7 8 9 10 11 12 13 14
INPUT OFFSET VOLTAGE DRIFT (nV/°C)
100
98
96
94
92
90
88
86
84
82
80
0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
10 20 30
SUPPLY VOLTAGE (V)
40
SUPPLY CURRENT
vs. TEMPERATURE
100
98
96
94
92
90
88
86
84
82
80
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
INPUT BIAS CURRENT
VS. COMMON-MODE VOLTAGE
180
160
140
120
100
80
60
40
20
0
02468
COMMON-MODE VOLTAGE (V)
2
1
0
-1
-2
-3
-4
-6
10
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
-4 -2 0 2 4
COMMON-MODE VOLTAGE (V)
6
800
INPUT OFFSET VOLTAGE
VS. TEMPERATURE
3
2
1
0
-1
-2
-3
-4
-5
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. TEMPERATURE
600
400
200
0
-200
-400
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
Maxim Integrated
5
5 Page 
MAX44244/MAX44245/MAX44248
36V, Precision, Low-Power, 90µA,
Single/Quad/Dual Op Amps
circuit, both the DAC and the reference are referred to
the local ground. The MAX44244 op-amp inputs are
capable of swinging to the negative supply (which is the
local ground in this case). R3 acts as a current mirror with
RSENSE. Therefore, if RSENSE = 50Ω (i.e. 20mA will drop
1V) and if the current through R3 is 10μA when IOUT is
20mA (0.05% error) then R3 = 100kΩ. R1 is chosen along
with the reference voltage to provide the 4mA offset. R2
= 512kΩ for 20mA full scale or R2 = 614kΩ for 20% over-
range. RSENSE is ratiometric with R3, R1 independently
sets the offset current and R2 independently sets the
DAC scaling.
Driving High-Performance ADCs
The MAX44244/MAX44245/MAX44248’s low input offset
voltage and low noise make these amplifiers ideal for
ADC buffering. Weight scale applications require a low-
noise, precision amplifier in front of an ADC. Figure 1
details an example of a load cell and amplifier driven
from the same 5V supply, along with a 16-bit delta sigma
ADC such as the MAX11205.
The MAX11205 is an ultra-low-power (< 300FA, max
active current), high-resolution, serial output ADC. It
provides the highest resolution per unit power in the
industry and is optimized for applications that require
very high dynamic range with low power such as sensors
on a 4–20mA industrial control loop. The devices provide
a high-accuracy internal oscillator that requires no
external components.
Layout Guidelines
The MAX44244/MAX44245/MAX44248 feature ultra-low
input offset voltage and noise. Therefore, to get optimum
performance follow the layout guidelines.
Avoid temperature tradients at the junction of two
dissimilar metals. The most common dissimilar metals
used on a PCB are solder-to-component lead and
solder-to-board trace. Dissimilar metals create a local
thermocouple. A variation in temperature across the
board can cause an additional offset due to Seebeck
effect at the solder junctions. To minimize the Seebeck
effect, place the amplifier away from potential heat
sources on the board, if possible. Orient the resistors
such that both the ends are heated equally. It is a good
practice to match the input signal path to ensure that the
type and number of thermoelectric juntions remain the
same. For example, consider using dummy 0ω resistors
oriented in such a way that the thermoelectric source, due
to the real resistors in the signal path, are cancelled. It is
recommended to flood the PCB with ground plane. The
ground plane ensures that heat is distributed uniformly
reducing the potential offset voltage degradation due to
Seebeck effect.
5V
Figure 1. Weight Application
Maxim Integrated
5V
½ MAX44248
AMP A
5V
VDD
RF
RG
RF
VDD
VIN+
MAX11205
OUTPUT
VIN- VSS
MICRO
CONTROLLER
AMP B
½ MAX44248
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX44244.PDF ] | |
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