Rainbow-electronics MAX5511 Manual de usuario descargar pdf (Pagina 15)

Applications Information

1-Cell and 2-Cell Circuit

See Figure 3 for an illustration of how to power the

MAX5510/MAX5511 with either one lithium-ion battery

or two alkaline batteries. The low current consumption

of the devices makes the MAX5510/MAX5511 ideal for

battery-powered applications.

Programmable Current Source

See the circuit in Figure 4 for an illustration of how to

configure the MAX5510 as a programmable current

source for driving an LED. The MAX5510 drives a stan-

dard NPN transistor to program the current source. The

current source (I

LED

) is defined in the equation in

Figure 4.

Voltage Biasing a Current-Output

Transducer

See the circuit in Figure 5 for an illustration of how to con-

figure the MAX5510 to bias a current-output transducer.

In Figure 5, the output voltage of the MAX5510 is a func-

tion of the voltage drop across the transducer added to

the voltage drop across the feedback resistor R.

Self-Biased Two-Electrode

Potentiostat Application

See the circuit in Figure 6 for an illustration of how to

use the MAX5511 to bias a two-electrode potentiostat

on the input of an ADC.

MAX5510/MAX5511

+1.8V to +5.5V, Ultra-Low-Power, 8-Bit,

Voltage-Output DACs

______________________________________________________________________________________ 15

REFIN

MAX5510

MAX6006

(1µA, 1.25V

SHUNT

REFERENCE)

GND

+1.25V

0.01µF

536kΩ

DAC

VOUT

DAC

IS THE NUMERIC VALUE

OF THE DAC INPUT CODE.

OUT

(4.88mV / LSB)

1.8V ≤ V

ALKALINE

≤ 3.3V

2.2V ≤ V

LITHIUM

≤ 3.3V

OUT

REFIN

× N

DAC

256

0.1µF

Figure 3. Portable Application Using Two Alkaline Cells or One Lithium Coin Cell

2N3904

DAC

IS THE NUMERIC VALUE OF THE DAC INPUT CODE.

LED

REFIN

LED

MAX5510

V+

DAC

VOUT

LED

REFIN

× N

DAC

256 × R

Figure 4. Programmable Current Source Driving an LED

DAC

IS THE NUMERIC VALUE

OF THE DAC INPUT CODE.

REFIN

MAX5510

DAC

VOUT

OUT

= V

BIAS

+ (I

× R)

OUT

BIAS

TRANSDUCER

BIAS

REFIN

× N

DAC

256

Figure 5. Transimpedance Configuration for a Voltage-Biased

Current-Output Transducer

1 2 ... 10 11 12 13 14 15 16 17 18

MAX5510/MAX5511 1
Voltage-Output DACs 1

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Rainbow-electronics MAX5511 Manual de usuario Pagina 15

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