Specifications

Sensors
Pressure sensors and weigh scales (force sensing)
64 Maxim Industrial Solutions
Benefits
• Minimize system calibration over time
and temperature (MAX9617/MAX9618)
– Autozero op-amp technology reduces
TCV
OS
to 120nV/°C
• Provides the most accurate measure-
ments at the lowest power (MAX11200*)
– Highest resolution per-unit-power ADC
for sensors on a 4–20mA loop: 21 bits of
noise-free range at 10sps drawing close
to 200µA
– Lowest < 780µW noise density for low-
frequency design
• Distinguishes extremely small changes
over a wide range of pressure or weight
(MAX11200)
– 21 bits of noise-free range identify
signals down to 500nV steps for
wide-range, high-accuracy sensor
applications
– Industry’s lowest noise, autozero op amp
operation with < 420nV
P-P
noise from
0.1Hz to 10Hz
– No 1/f component ensures low
distortion below 0.1Hz in the signal-
conditioning stage
MAX9617/MAX9618, MAX11200*
One of the biggest challenges with interfacing to sensors is the
low signal levels. Since the signal bandwidth (BW) lies in low hertz
for many sensors, the 1/f noise of op amps is an important factor.
Maxim’s MAX9617/MAX9618 low-power (< 100µA) op amps offer the
industry’s lowest noise, autozero (42nV/√Hz) operation. These devices
have the best-in-class peak-to-peak noise of < 420nV
P-P
for 0.1Hz to
10Hz BW. Coupled with the MAX11200, industry’s leading low-power,
24-bit (21 noise-free bits) resolution, sigma-delta ADC, these op amps
form an ideal circuit for capturing low-frequency, low-amplitude
signals accurately.
*Future product—contact factory for availability.
Maintain high accuracy over time and temperature
Circuit using the MAX9617/MAX9618 op amps and the MAX11200 ADC achieves high accuracy over time and temperature.
AIN+
AIN−
REF+
REF−
CURRENT
REFERENCE
MAX11200*
MAX9617/
MAX9618
+
−
X 100