Rainbow-electronics MAX5531 Manual do Utilizador descarregar pdf (Página 17)

MAX5530/MAX5531

Ultra-Low-Power, 12-Bit,

Voltage-Output DACs

______________________________________________________________________________________ 17

2N3904

DAC

IS THE NUMERIC VALUE OF THE DAC INPUT CODE.

LED

REFIN

LED

MAX5530

V+

DAC

VOUT

LED

REFIN

× N

DAC

4096 × R

Figure 4. Programmable Current Source Driving an LED

DAC

BAND

GAP

TO ADC

OUT

REFOUT

MAX5531

TO ADC

SENSOR

REF

Figure 6. Self-Biased Two-Electrode Potentiostat Application

DAC

IS THE NUMERIC VALUE

OF THE DAC INPUT CODE.

REFIN

MAX5530

VOUT

OUT

= V

BIAS

+ (I

× R)

OUT

BIAS

TRANSDUCER

BIAS

REFIN

× N

DAC

4096

DAC

Figure 5. Transimpedance Configuration for a Voltage-Biased

Current-Output Transducer

IS THE DAC INPUT CODE

(0 TO 4095 DECIMAL).

REFIN

MAX5530

OUT

REFIN

× N

4096

DAC

Figure 7. Unipolar Output Circuit

DAC CONTENTS

MSB

LSB

ANALOG OUTPUT

1111 1111 1100

REF

(4095/4096)

1000 0000 0001

REF

(2049/4096)

1000 0000 0000

REF

(2048/4096) = +V

REF

/ 2

0111 1111 1111

REF

(2047/4096)

0000 0001 0001

REF

(1/4096)

0000 0000 0000

Table 4. Unipolar Code Table (Gain = +1)

DAC CONTENTS

MSB

LSB

ANALOG OUTPUT

1111 1111 1111

REF

(2047/2048)

1000 0000 0001

REF

(1/2048)

1000 0000 0000

0111 1111 1111

-V

REF

(1/2048)

0000 0000 0001

-V

REF

(2047/2048)

0000 0000 0000

-V

REF

(2048/2048) = -V

REF

Table 5. Bipolar Code Table (Gain = +1)

1 2 ... 12 13 14 15 16 17 18 19

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