Digitally Programmable Sensor Signal

Amplifier with EMI Filters

Data Sheet

AD8556

FEATURES

EMI filters at input pins

Specified from −40°C to +140°C

Low offset voltage: 10 µV maximum

Low input offset voltage drift:

65 nV/°C maximum

High CMRR: 94 dB minimum

Digitally programmable gain and output offset voltage

Programmable output clamp voltage

Open and short wire fault detection

Low-pass filtering

Single-wire serial interface

Stable with any capacitive load

SOIC_N and LFCSP_WQ packages

4.5 V to 5.5 V operation

APPLICATIONS

Pressure and position sensors

Precision current sensing

Strain gages

FUNCTIONAL BLOCK DIAGRAM

VDD

VSS

1

2

3

+IN

–IN

OUT

A3

VDD

VSS

1

2

3

+IN

–IN

OUT

A4

VDD

VSS

1

2

3

+IN

–IN

OUT

A2

VDD

VSS

1

2

3

+IN

–IN

OUT

A1

VSS

1

2

3

+IN

–IN

OUT

A5

R7

P4

R5

VDD

DIGIN

VCLAMP

R3

P2

P1

R1

R2

R4

R5

P3

VNEG

VPOS

DAC

LOGIC

EMI

FILTER

EMI

FILTER

EMI

FILTER

RF

EMI

FILTER

FILT/DIGOUT

AD8556

VSS

EMI

FILTER

Figure 1.

Rev. B

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