LTC1992 datasheet(32/42 Pages) AD

32 / 42 page

LTC1992 Family

1992fb

APPLICATIONS INFORMATION

Figure 5. Input Signal Limitations

–

RIN

INM

NODE

INP

NODE

RIN

RFB

VOCM

A. CALCULATE VINCM MINIMUM AND MAXIMUM GIVEN RIN, RFB AND VOCM

VINCM(MAX) = (+VS – 1.3V) +

(+VS – 1.3V – VOCM)

VINCM(MIN) = (–VS – 0.1V) +

(–VS – 0.1V – VOCM)

B. WITH A KNOWN VINCM, RIN, RFB AND VOCM, CALCULATE COMMON MODE

VOLTAGE AT INP AND INM NODES (VINCM(AMP)) AND CHECK THAT IT IS

WITHIN THE SPECIFIED LIMITS.

VINCM(AMP) =

VINCM +

VOCM

RFB

–B

–VIN

–A

VINCM

VOUTCM

VINDIFF

4AVP-PDIFF

+VIN

2AVP-P

2BVP-P

–VOUT

+VOUT

LTC1992

VOUTDIFF

4BVP-PDIFF

VINP + VINM

G + 1

Differential Input Signals

–

1992 F05

RIN

INM

NODE

INP

NODE

RIN

RFB

VOCM

RFB

–B

VINREF

–A

VOUTCM

VREF

VINSIG

2AVP-P

2BVP-P

–VOUT

+VOUT

LTC1992

VOUTDIFF

4BVP-PDIFF

Single-Ended Input Signals

INPUT COMMON MODE LIMITS

OUTPUT SIGNAL CLIPPING LIMIT

INPUT COMMON MODE LIMITS (NOTE: FOR THE FIXED GAIN LTC1992-X PARTS, VINREF AND VINSIG CANNOT EXCEED THE SUPPLIES)

OUTPUT SIGNAL CLIPPING LIMIT

VINDIFF(MAX)(VP-PDIFF) = THE LESSER VALUE OF

(+VS – VOCM) OR

(VOCM – –VS)

VINREF

VINSIG(MAX) = 2

VINSIG(MAX) = THE LESSER VALUE OF VINREF +

(+VS – VOCM) OR VINREF +

(VOCM – –VS)

+VS – 1.3V –

+VS – 1.3V – VOCM

((

))

VINREF

VINSIG(MIN) = 2

–VS – 0.1V –

–VS – 0.1V – VOCM

((

))

VINSIG(MIN) = THE GREATER VALUE OF VINREF +

(–VS – VOCM) OR VINREF +

(VOCM – +VS)

VINSIGP-P = 2

(+VS – –VS) – 1.2V

((

))

RFB

RIN

G =

RFB

RIN

G =

LTC1992 Datasheet(PDF) 32 Page - Analog Devices

LTC1992 Datasheet(HTML) 32 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL