MAX1450 Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX1450

Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors

Maxim Integrated 

Low-Cost, 1%-Accurate Signal Conditioner

for Piezoresistive Sensors

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +5V, VSS = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

CURRENT SOURCE

Bridge Current Range

IBDRIVE

0.1

0.5

2.0

mA

Bridge Voltage Swing

VBDRIVE

VSS +

1.3

VDD -

1.3

V

Current-Source Gain

AA

∆IBDRIVE/∆IISRC (Figure 2)

13

µA/µA

Current-Source Input Voltage

Range

BUFFER (BBUF)

Voltage Swing

Current Drive

VISRC

No load

VBDRIVE = 2.5V

VSS +

1.3

VSS +

1.3

-100

VDD-

1.3

V

VDD -

1.3

V

100

µA

Offset Voltage

VOFS (VBDRIVE - VBBUF) at VBDRIVE = 2.5V, no load

-20

20

mV

Note 1: Contact factory for high-volume applications requiring less than 1.5mA.

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

Note 3: The sensor and the MAX1450 must always be at the same temperature during calibration and use.

Note 4: This is the maximum allowable sensor offset at minimum gain (39V/V).

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

voltage of 2.5V. Operating at lower bridge excitation voltages can accommodate higher sensitivities.

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