MAX5521ETC+【PDF 8/20 页】IC DAC 10BIT SGL ULP 12-TQFN

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MAX5520/MAX5521

+1.8V to +5.5V, Ultra-Low-Power, 10-Bit,

Voltage-Output DACs

______________________________________________________________________________________

Applications Information

1-Cell and 2-Cell Circuit

See Figure 3 for an illustration of how to power the

MAX5520/MAX5521 with either one lithium-ion battery

or two alkaline batteries. The low current consumption

of the devices makes the MAX5520/MAX5521 ideal for

battery-powered applications.

Programmable Current Source

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

configure the MAX5520 as a programmable current

source for driving an LED. The MAX5520 drives a stan-

dard NPN transistor to program the current source. The

current source (ILED) 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 MAX5520 to bias a current-output transducer.

In Figure 5, the output voltage of the MAX5520 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 MAX5520 to bias a two-electrode potentiostat

on the input of an ADC.

Unipolar Output

Figure 7 shows the MAX5520 in a unipolar output con-

figuration with unity gain. Table 4 lists the unipolar out-

put codes.

Bipolar Output

The MAX5520 output can be configured for bipolar

operation, as shown in Figure 8. The output voltage is

given by the following equation:

VOUT = VREF x [(NA - 512) / 512]

where NA represents the numeric value of the DAC’s

binary input code. Table 5 shows digital codes (offset

binary) and the corresponding output voltage for the

circuit in Figure 4.

Configurable Output Gain

The MAX5520/MAX5521 have a force-sense output,

which provides a connection directly to the inverting ter-

minal of the output op amp, yielding the most flexibility.

The advantage of the force-sense output is that specific

gains can be set externally for a given application. The

gain error for the MAX5520/MAX5521 is specified in a

unity-gain configuration (op-amp output and inverting ter-

minals connected), and additional gain error results from

external resistor tolerances. Another advantage of the

force-sense DAC is that it allows many useful circuits to

be created with only a few simple external components.

An example of a custom fixed gain using the force-sense

output of the MAX5520/MAX5521 is shown in Figure 9. In

this example R1 and R2 set the gain for VOUT.

VOUT = [(VREFIN x NA) / 1024] x [1 + (R2 / R1)]

where NA represents the numeric value of the DAC

input code.

REFIN

MAX5520

MAX6006

(1A, 1.25V

SHUNT

REFERENCE)

GND

+1.25V

0.01F

536k

VDD

DAC

VOUT

NDAC IS THE NUMERIC VALUE

OF THE DAC INPUT CODE.

VOUT (1.22mV / LSB)

1.8V ≤ VALKALINE ≤ 3.3V

2.2V ≤ VLITHIUM ≤ 3.3V

VOUT =

VREFIN × NDAC

1024

0.1F

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

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