Specifications

53Sensors: Featured Products
Maintain High Accuracy Over Time and
Temperature
MAX9617/MAX9618, MAX11200
One of the biggest challenges when interfacing to sensors is dealing with the
low signal levels. Since the signal bandwidth (BW) lies in the low hertz range for
many sensors, the 1/f noise of op amps is an important factor. Maxim’s MAX9617/
MAX9618 low-power (< 100µA) autozero op amps oer the industry’s lowest noise
(42nV/√Hz) operation. These devices have the best-in-class peak-to-peak noise of
< 420nV
P-P
for 0.1Hz to 10Hz BW. Coupling these op amps with the MAX11200, the
industry’s leading low-powered, 24-bit (21 noise-free bits), sigma-delta ADC, creates
an ideal solution for capturing low-frequency, low-amplitude signals accurately.
Benefits
• Minimize system errors over time and
temperature
◦ Autozero op-amp technology
reduces TCV
OS
to 120nV/°C
• Provide the most accurate
measurements at the lowest power
◦ 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
• Simple two-chip solution maximizes
dynamic range and resolution
◦ 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 (< 420nV
P-P
noise from 0.1Hz to
10Hz)
◦ No 1/f component ensures low
distortion below 0.1Hz in the signal-
conditioning stage
AIN+
AIN−
REF+
REF−
CURRENT
REFERENCE
MAX11200
MAX9617
MAX9618
+
−
X 100
Circuit using the MAX9617/MAX9618 op amps and the MAX11200 ADC achieves high accuracy over time and temperature.