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MAX44246 数据手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
封装:
µMAX-8
描述:
36V ，低噪声，高精度，双通道运算放大器 36V, Low-Noise, Precision, Dual Op Amp
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MAX44246数据手册
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11Maxim Integrated
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
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, V
OUT
equal to I
LOAD
x R
SENSE
x (1 + R
2
/R
1
).
Figure 1. Low-Side Current Sensing
V
SUPPLY
OUT
R2
R1
I
LOAD
R
SENSE
½ MAX44246
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