0.1%-Accurate Signal Conditioner

for Piezoresistive Sensor Compensation

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

28-Pin Wide SO (derate 12.50mW/°C above +70°C) ..........1W

32-Pin TQFP (derate 11.1mW/°C above +70°C)...........889mW

Operating Temperature Ranges

MAX1457C_ _ ......................................................0°C to +70°C

MAX1457A_ _ .................................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

Reference voltage = 5.000V

Gain = 54, DC to 10Hz, sensor impedance =

5k

Ω, full-span output = 4V

(Note 5)

(Note 4)

5k

(Notes 2, 3)

CONDITIONS

µV

200

DAC Voltage Resolution

V

Current-Source Reference Input

Voltage Range

V

Bridge Voltage Swing

mA

0.1

0.5

2.0

Bridge Current Range

%FSO

0.0025

Output Noise

mA

-1.0

1.0

(sink)

(source)

Output Current Range

V

Output Voltage Swing

ppm/°C

±50

Differential Signal Gain Tempco

V/V

54 to 306

Differential Signal Gain Range

mA

2.0

2.6

Supply Current

V

4.5

5

5.5

Supply Voltage

mV/V

5 to 30

Input-Referred Adjustable

Full-Span Output Range

mV

±100

Input-Referred Adjustable

Offset Range

dB

90

CMRR

Common-Mode Rejection Ratio

ms

1

Output Step-Response Time

M

Ω

1

M

Ω

1

Input Impedance

µV/°C

±0.5

Input-Referred Offset Tempco

0.01

Amplifier Gain Nonlinearity

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

LSB

2

Differential Nonlinearity

Bits

16

DAC Resolution

V/V

49

54

60

Minimum Differential Signal Gain

GENERAL CHARACTERISTICS

ANALOG INPUT (PGA)

ANALOG OUTPUT (PGA)

DIGITAL-TO-ANALOG CONVERTERS

CURRENT SOURCE

No load