MAX1458CSLASHD datasheet(3/20 Pages) MAXIM

3 / 20 page

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V, VSS = 0, TA = +25°C, unless otherwise noted.)

Note 1: Excludes the sensor or load current.

Note 2: All electronics temperature errors are compensated together with sensor errors.

Note 3: The sensor and the MAX1458 must always be at the same temperature during calibration and use.

Note 4: This is the maximum allowable sensor offset.

Note 5: This is the sensor’s sensitivity normalized to its drive voltage, assuming a desired full-span output of 4V and a bridge

voltage of 2.5V.

Note 6: Bit weight is ratiometric to VDD.

1%-Accurate, Digitally Trimmed

Sensor Signal Conditioner

_______________________________________________________________________________________

Typically 4600ppm/°C tempco

VFSOTC = 2.5V

No load

Input referred, VDD = 5V (Note 6)

CONDITIONS

Ω

100

RTEMP

Temperature-Dependent

Resistor

Ω

RFTC

FSO Trim Resistor

Ω

RISRC

Current-Source Reference

Resistor

VSS + 1.3

VDD - 1.3

VBDRIVE

Bridge Voltage Swing

0.1

0.5

2.0

IBDRIVE

Bridge Current Range

µA

-20

Current Drive

VSS + 0.3

VDD - 1.3

Output Voltage Swing

Bits

DAC Resolution

mV/bit

DAC Bit Weight

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

LSB

±1.5

DNL

Differential Nonlinearity

Bits

DAC Resolution

VSS + 1.3

VDD - 1.3

VISRC

Reference Input Voltage Range

(ISRC)

DAC reference = VBDRIVE = 2.5V

DAC reference = VDD = 5.0V

mV/bit

1.4

∆VOUT

∆Code

Offset TC DAC Bit Weight

mV/bit

2.8

∆VOUT

∆Code

Offset DAC Bit Weight

DAC reference = VBDRIVE = 2.5V

DAC reference = VDD = 5.0V

mV/bit

0.6

∆VFSOTC

∆Code

FSO TC DAC Bit Weight

mV/bit

1.22

∆VISRC

∆Code

FSO DAC Bit Weight

CURRENT SOURCE

DIGITAL-TO-ANALOG CONVERTERS

IRO DAC

FSOTC BUFFER

INTERNAL RESISTORS

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