Specifications

11PLCs: Featured Products
24-Bit ADC Oers the Highest Resolution for
4–20mA Loops
MAX11210
The MAX11210 24-bit, 1-channel ADC oers an industry-leading 23.9 bits eective
resolution at < 300µA (max) supply current. The MAX11210’s higher eective
resolution eliminates power-hungry gain stages while achieving the highest
precision possible from the sensor. Applications such as 4–20mA loop sensors put a
premium on power dissipation. ADCs are given a maximum power budget of 500µA
to resolve minute changes from sensors that measure signals such as temperature,
pressure, and ow rate.
The MAX11210 reduces power, cost, and size in two unique ways, oering four
general-purpose input/output (GPIO) lines, and integrating buer ampliers on the
analog and reference inputs. The four GPIO lines can be used to control an external
16-channel multiplexer, eectively converting the MAX11210 into a 16-channel ADC.
Bringing the mux control local to the ADC eliminates up to four digital isolators.
Isolation is required to achieve the best performance from an ultra-low noise system.
Benefits
• Offers highest resolution for low-
power 4–20mA applications
◦ 23.9-bit effective resolution
◦ 230µA active current, 0.4µA sleep
current
• Allows reduced board size due to
highly integrated functionality in small
package
◦ No external buffers or amplifiers
needed
◦ µMAX
®
packages as small as 15mm
2
4 GPIOs
DIFFERENTIAL
ANALOG
INPUT
DIFFERENTIAL
REFERENCE
INPUT
4-WIRE SPI
24-BIT
ADC
AVDD = 3V DVDD = 1.7V TO 3.6V
MAX11210
PROGRAMMABLE
GAIN (1 TO 16)
GPIOs
SWITCH
CONTROL
8
MUX
MULTIPLE
ANALOG
INPUTS
Eliminates external
ampliers
INTERNAL
OSCILLATOR
ADC CLOCK
High-impedance
inputs for direct
sensor connection
The MAX11210 reduces system cost and size by integrating the input and reference buffers.