MAX9922 Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX9922

Ultra-Precision, High-Side Current-Sense Amplifiers

Maxim Integrated 

Ultra-Precision, High-Side

Current-Sense Amplifiers

ELECTRICAL CHARACTERISTICS (continued)

(VRSB = VRS+ = VRS- = +12V, VDD = +3.3V, VGND = 0V, VREF = VDD/2 for bidirectional, VREF = 0V for unidirectional, VSENSE = VRS+ - VRS-

= 0V, MAX9922 is set for AV =100V/V (R1 = 1kΩ, R2 = 99kΩ), SHDN = VDD, TA = -40°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Power-Down Supply Current

IRSBL VDD = VREF = 0V, VRSB = VRS+ = VRS- = 28V

0.05

1

µA

Power-Up Time

MAX9922, AV = 100V/V, VREF = 0V, VSENSE =

10mV, VDD = 0V to 3.3V, settling to 0.1% of final

800

µs

value

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

All devices are 100% production tested at TA = +85°C. All temperature limits are guaranteed by design.

VOS is measured in bidirectional mode with VREF = VDD/2.

Data sheet limits are guaranteed by design and bench characterization. Thermocouple effects preclude measurement of

this parameter during production testing. Devices are screened during production testing to eliminate defective units.

VOS drift limits are guaranteed by design and bench characterization and are the average of drift from -40°C to +25°C and

from +25°C to +85°C.

VRSB = VRS+ = 12V, VREF = VDD/2 for bipolar mode and VREF = 0V for unipolar mode. Gain accuracy and gain linearity are

specified over a VSENSE range that keeps the output voltage 250mV away from the rails to achieve full accuracy. Output of

the part is rail-to-rail, and goes to within 25mV of the rails, but accuracy is not maintained. Linear operation is not guaran-

teed for VSENSE voltages > ±150mV. See the Typical Operating Characteristics section for plots of Input vs. Output.

This is the worst-case REF current needed to directly drive the bottom terminal of the gain setting resistors, at VDD = 3.3V,

and VREF = VDD/2 while maintaining gain accuracy. An internal 1kΩ resistor (R1) is present in the MAX9923T/

MAX9923H/MAX9923F between the FB and REF pins, while in the MAX9922 the resistor is external and user selectable. A

voltage identical to the VSENSE develops across this resistor. In all versions the REF input current is dependent on the mag-

nitude and polarity of VSENSE, and in the MAX9922 it is dependent on the value of the external resistor as well. The input

bias current for REF is typically 1pA in the MAX9922 since it connects to the gate of a MOS transistor. See the External

Reference section for more details.

The range of VREF, VCM, and VSENSE may limit the output swing of the MAX9922 with adjustable gain set to less than

100V/V.

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