Rainbow-electronics MAX1495 Manual do Utilizador descarregar pdf (Página 19)

Transfer Functions

Figures 15–18 show the MAX1491/MAX1493s’ transfer

functions. The transfer function for the MAX1493/

MAX1495 with AIN+ - AIN- ≥ 0 and RANGE = GND is:

The transfer function for the MAX1493 with AIN+ - AIN-

< 0 and RANGE = GND is:

The transfer function for the MAX1491 with AIN+ - AIN-

≥ 0 and RANGE = GND is:

The transfer function for the MAX1491 with AIN+ - AIN-

< 0 and RANGE = GND is:

The transfer function for the MAX1493/MAX1495 with

AIN+ - AIN- ≥ 0 and RANGE = DV

is:

The transfer function for the MAX1493 with AIN+ - AIN-

< 0 and RANGE = DV

is:

The transfer function for the MAX1491 with AIN+ - AIN-

≥ 0 and RANGE = DV

is:

The transfer function for the MAX1491 with AIN+ - AIN-

< 0 and RANGE = DV

is:

Counts

AIN AIN

REF REF

=× ×

⎛

⎝

⎜

⎞

⎠

⎟

×+

1 024 2000 10 1.

Counts

AIN AIN

REF REF

=×

⎛

⎝

⎜

⎞

⎠

⎟

××

1 024 2000 10.

Counts

AIN AIN

REF REF

=× ×

⎛

⎝

⎜

⎞

⎠

⎟

×+

1 024 20 000 10 1. ,

Counts

AIN AIN

REF REF

=×

⎛

⎝

⎜

⎞

⎠

⎟

××

1 024 20 000 10. ,

Counts

AIN AIN

REF REF

=× ×

⎛

⎝

⎜

⎞

⎠

⎟

1 024 2000 1.

Counts

AIN AIN

REF REF

=×

⎛

⎝

⎜

⎞

⎠

⎟

1 024 2000.

Counts

AIN AIN

REF REF

=× ×

⎛

⎝

⎜

⎞

⎠

⎟

1 024 20 000 1. ,

Counts

AIN AIN

REF REF

=×

⎛

⎝

⎜

⎞

⎠

⎟

1 024 20 000. ,

MAX1491/MAX1493/MAX1495

3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

______________________________________________________________________________________ 19

Figure 15. MAX1493/MAX1495 Transfer Function ±2V Range

-2V

ANALOG INPUT VOLTAGE

+2V

LCD

1 - - - -

19,999

- 0

- 1

- 2

-19,999

- 1 - - - -

-100µV

100µV

Figure 16. MAX1493/MAX1495 Transfer Function ±200mV Range

-200mV

ANALOG INPUT VOLTAGE

+200mV

LCD

1 - - - -

19,999

- 0

- 1

- 2

-19,999

- 1 - - - -

-10µV

10µV

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25

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