MPXM2102AS datasheet(493/670 Pages) MOTOROLA

493 / 670 page

AN1556

3–347

Motorola Sensor Device Data

www.motorola.com/semiconductors

THE EXAMPLE CIRCUIT

Referring to Figure 1, both pressure sensors are interfaced

to the same amplifier circuit topology. In Tables 1 and 2, the

relevant characteristics for the MPX10 and MPX2010 show

the

device–to–device

and

temperature

variations.

Additionally, the tolerances on the voltage regulator and the

resistors that establish the gain and dc voltage level shift

(VREF) are considered in the methodology. The voltage

regulator’s device–to–device tolerance is

±5%, and each

resistor’s tolerance is

±1%.

–

Vin

5 V REG. (

±5%)

OUT

GND

RREF1

S–

S+

MPX10 OR MPX2010

LM33272

VO TO A/D

RREF2

VREF

Figure 1. MPX10/MPX2010 Circuit Schematic

Table 1. MPX10 Variation Characteristics

Characteristic (VS = 5.0 V)

Symbol

Min

Typ

Max

Unit

Pressure Range

POP

—

kPa

Full–Scale Span

VFSS

Zero Pressure Offset

Voff

Temperature Coefficient of Full–Scale Span (see Note 1)

TCVFSS

– 0.22

– 0.19

– 0.16

°C

Temperature Coefficient of Offset (see Note 2)

TCVoff

—

±15

—

µV/°C

Note 1: Slope of end–point straight line fit to full–scale span at – 40

°C and +125°C relative to 25°C

Note 2: Slope of end–point straight line fit to zero pressure offset at – 40

°C and +125°C relative to 25°C

Table 2. MPX2010 Variation Characteristics

Characteristic (VS = 5.0 V)

Symbol

Min

Typ

Max

Unit

Pressure Range

POP

—

kPa

Full–Scale Span

VFSS

12.5

Zero Pressure Offset

Voff

– 0.5

—

0.5

Temperature Effect on Full–Scale Span (see Note 1)

TCVFSS

– 1.0

—

1.0

%FSS

Temperature Effect on Offset (see Note 2)

TCVoff

– 0.5

—

0.5

Note 1: Maximum change in full–scale span at 0

°C and 85°C relative to 25°C

Note 2: Maximum change in offset at 0

°C and 85°C relative to 25°C

The amplifier topology used is a two–operational amplifier

gain stage that has all the desirable characteristics of a

differential–signal instrumentation amplifier:

• high input impedance

• low output impedance

• differential to single–ended conversion of the input signal

• high gain capability

• dc level shifting capability

For good common mode rejection, the following resistor

ratios are used:

With this simplification, the transfer function of the amplifier

VO + (

) 1

) (S) –S–) ) V

REF

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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