|
|
PDF MAX44246 Data sheet ( Hoja de datos )
| Número de pieza | MAX44246 | |
| Descripción | Single/Quad/Dual Op Amps | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX44246 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
EVALUATION KIT AVAILABLE
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
General Description
The MAX44241/MAX44243/MAX44246 are 36V, ultra-
precision, low-noise, low-drift, single/quad/dual opera-
tional amplifiers that offer near-zero DC offset and drift
through the use of patented chopper stabilized and
auto-zeroing techniques. This method constantly mea-
sures and compensates the input offset, eliminating drift
over time and temperature and the effect of 1/f noise.
These single/quad/dual devices feature rail-to-rail out-
puts, operate from a single 2.7V to 36V supply or dual
±1.35V to ±18V supplies, and consume only 0.42mA per
channel, with only 9nV/√Hz input-referred voltage noise.
The ICs are available in 8-pin FMAXM or SO packages
and are rated over the -40NC to +125NC temperature
range.
Applications
Transducer Amplifiers
Load Cell Amplifiers
Precision
Instrumentation
Battery-Powered
Equipment
PLC Analog I/O
Modules
Benefits and Features
S Reduces Noise-Sensitive Precision Applications
• Low 9nV/√Hz Noise at 1kHz
• Integrated EMI Filter
S Eliminates Cost of Calibration with Increased
Accuracy and Patented Auto-Zero Circuitry
• Ultra-Low Input VOS: 5µV (max)
• Low 20nV/°C (max) of Offset Drift
S Suitable for High-Bandwidth Applications
• 1µs Fast Settling Time
• 5MHz Gain-Bandwidth Product
S Low 0.55mA Per Channel (max) Quiescent Current
S Wide Supply for High-Voltage Front-Ends
• 2.7V to 36V Supply Range
S Rail-to-Rail Output
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX44241.related.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
15V 3.3V
½ MAX44246
BUFFER
R
15V
-15V
50RG R
15V
R1 3V VOUT
MAX6126
VDD
RG 50RG
BUFFER
R
VDD VREF
VIN+
MAX11211 OUTPUT
MICRO-
PROCESSOR
15V -15V
R ½ MAX44246
BUFFER
1.5V
½ MAX44246
VIN-
VSS
C1
-15V
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6375; Rev 7; 4/15
1 page  
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Typical Operating Characteristics
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 3)
INPUT OFFSET VOLTAGE HISTOGRAM
35
INPUT OFFSET VOLTAGE DRIFT
HISTOGRAM
45
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
500
30 40 450
35 400 VIN = VDD/2
25 30 350 NO LOAD
20 25 300
250
15
20
200
10 15 150
10 100
5 5 50
0
-1.5 -1.0 -0.5 0 0.5 1.0 1.5
OFFSET VOLTAGE (µV)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
470
VIN = VDD/2
460 NO LOAD
450
440
0
-0.006 -0.004 -0.002 0 0.002 0.003 0.005
OFFSET VOLTAGE DRIFT (µV/°C)
INPUT OFFSET VOLTAGE vs. INPUT
COMMON-MODE VOLTAGE
3
2
1
0 5 10 15 20 25 30 35 40
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
5
430 0 0
420
-1
410
400 -2
390
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
INPUT BIAS CURRENT vs. VCM
vs. TEMPERATURE
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
-1
IB+ (TA = +125°C) IB- (TA = +25°C)
IB- (TA = +125°C) IB+ (TA = +25°C)
IB- (TA = -40°C) IB+ (TA = -40°C)
0123456789
VCM (V)
-3
0123456789
VCM (V)
INPUT BIAS CURRENT
vs. TEMPERATURE
700 toc08
600
IB+
500
400
300
200
100
IB-
0
-100
-200
-300
-50
0 50 100
TEMPERATURE (°C)
150
-5
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
180
170
160
150
140
130
120
110
100
90
80
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
Maxim Integrated
5
5 Page 
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Detailed Description
The MAX44241/MAX44243/MAX44246 are high-precision
amplifiers that provide below 5µV of maximum input-
referred offset and low flicker noise. These characteris-
tics are achieved by using a combination of proprietary
auto-zeroing and chopper stabilized techniques. This
combination of auto-zeroing and chopping ensures that
these amplifiers give all the benefits of zero-drift ampli-
fiers, while still ensuring low noise, minimizing chopper
spikes, and providing wide bandwidth. Offset voltages
due to power ripple/spikes as well as common-mode
variation, are corrected resulting in excellent PSRR and
CMRR specifications.
Noise Suppression
Flicker noise, inherent in all active devices, is inverse-
ly proportional to frequency present. Charges at the
oxide-silicon interface that are trapped-and-released
by MOSFET oxide occurs at low frequency more often.
For this reason, flicker noise is also called 1/f noise. The
MAX44241/MAX44243/MAX44246 eliminate the 1/f noise
internally, thus making them ideal choices for DC or sub-
Hz precision applications. The 1/f noise appears as a
slow varying offset voltage and is eliminated by the chop-
ping technique used.
Electromagnetic interference (EMI) noise occurs at higher
frequency, resulting in malfunction or degradation of elec-
trical equipment. The ICs have an input EMI filter to avoid
the output being affected by radio frequency interference.
The EMI filter composed of passive devices, presents sig-
nificant higher impedance to higher frequency.
Applications Information
ADC Buffer Amplifier
The MAX44241/MAX44243/MAX44246 have low input
offset voltage, low noise, and fast settling time that make
these amplifiers ideal for ADC buffers. Weight scales
are one application that often requires a low-noise, high-
voltage amplifier in front of an ADC. The Typical Operating
VSUPPLY
ILOAD
RSENSE
R1
½ MAX44246
OUT
R2
Figure 1. Low-Side Current Sensing
Circuit details an example of a load cell and ampli-
fier driven from the same ±10V supplies, along with the
MAX11211 18-bit delta sigma ADC. Load cells produce a
very small voltage change at their outputs; therefore driv-
ing 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 low input offset voltage and low noise of MAX44241/
MAX44243/MAX44246 allow a gain circuit to precede the
MAX11211 without losing any dynamic range at the ADC.
See the Typical Operating Circuit.
Precision Low-Side Current Sensing
The ICs’ ultra-low offset voltage and drift make them
ideal for precision current-sensing applications. Figure 1
shows the ICs in a low-side current-sense configuration.
This circuit produces an accurate output voltage, VOUT
equal to ILOAD x RSENSE x (1 + R2/R1).
Maxim Integrated
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX44246.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX44241 | Single/Quad/Dual Op Amps | Maxim Integrated |
| MAX44243 | Single/Quad/Dual Op Amps | Maxim Integrated |
| MAX44244 | Single/Quad/Dual Op Amps | Maxim Integrated |
| MAX44245 | Single/Quad/Dual Op Amps | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |