Creator Electronics MAX1301 Especificaciones descargar pdf (Pagina 82)

Sensors

Current, light, and proximity sensing

www.digikey.com/maxim-industrial 77

Benefits

• Monitor current directly at the supply

side for highly accurate sensing

– The MAX9922 allows direct interface to

28V signals

– The MAX9922/MAX9923 use a patented

spread-spectrum autozeroing technique*

to remove offset and eliminate drift over

time and temperature

– 12-bit ADCs

• Versatile and simple solutions

accommodate a range of performance

and cost-based requirements

– Pin-compatible 8-, 10-, and 12-bit ADCs in

the same package

– 4 to 12 ADC channels on a 2-wire I

C bus

MAX9922/MAX9923, MAX11601, MAX11607,

MAX11613 families

Here is a very common circuit found in applications for power

monitoring. The MAX9923 current-sense amplifier amplifies the

differential voltage across the current-sense resistor with extremely

low offset and low noise.

The output of the MAX9923 and a resistor-divided output of the

supply is fed to a low-cost, 4-channel 12-bit ADC, the MAX11613.

While two independent supplies are shown here, the ADC could

be monitoring voltage and current on a group of supplies. The

MAX11601, MAX11607, MAX11613 families of ADCs are ideal for this

application as they provide a low-cost, small package (µMAX® or

QSOP) I

C solution with 4 to 12 channels.

*U.S. Patent #6,847,257.

Improve efficiency and increase reliability by monitoring a system’s power

Circuit for monitoring a system’s power supplies.

MAX9923T

MAX9923H

MAX9923F

GND

OUT

RS+ RS-

RSB

*OPTIONAL NOISE REDUCTION

3.3V

SHDN

OFF

1nF*

REF

SENSE

LOAD

BATT

1.9V TO

28V