MAX5237EUB+【PDF 2/19 页】IC DAC 10BIT DUAL 5V 10-UMAX

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MAX5236/MAX5237

Detailed Description

The MAX5236/MAX5237 10-bit, voltage-output DACs

are

easily

configured

with

3-wire

SPI/

QSPI/MICROWIRE serial interface. The devices include

a 16-bit data-in/data-out shift register and have an input

consisting of an input register and a DAC register. In

addition, these devices employ precision trimmed inter-

nal resistors to produce a gain of 1.6384V/V, maximiz-

ing the output voltage swing, and a programmable

shutdown output impedance of 1k

or 200k. The full-

scale output voltage is 4.092V for the MAX5237 and

2.046V for the MAX5236. These devices produce a

weighted output voltage proportional to the digital input

code with an inverted rail-to-rail ladder network (Figure 3).

External Reference

The reference inputs accept both AC and DC values

with a voltage range extending from 0.25V to 2.6V for

the MAX5237 and 0.25V to 1.5V for the MAX5236. For

proper operation do not exceed the input voltage

range limits. Determine the output voltage using the fol-

lowing equation:

VOUT_ = (VREF_ x NB / 1024) x 1.6384V/V

where NB is the numeric value of the DACs binary input

code (0 to 1023), VREF_ is the reference voltage, and

1.6384V/V is the gain of the internal output amplifier.

The code-dependent reference input impedance

ranges from a minimum of 28k

to several G at code

0. The code-dependent reference input capacitance is

typically 23pF.

Output Amplifier

The output amplifiers have internal resistors that pro-

vide for a gain of 1.6384V/V. These trimmed resistors

minimize gain error. The output amplifiers have a typical

slew rate of 0.6V/s and settle to 1/2LSB within 10s

(typ) with a load of 5k

in parallel with 100pF. Use the

serial interface to set the shutdown output impedance

of the amplifiers to 1k

or 200k.

Single-Supply 3V/5V, Voltage-Output, Dual,

Precision 10-Bit DACs

______________________________________________________________________________________

Pin Description

PIN

NAME

FUNCTION

OUTA

DAC A Output

REFA

Reference for DAC A

GND

Ground

LDAC

Load DACs A and B

Chip Select Input

SCLK

Shift Register Serial Clock Input

DIN

Serial Data Input

8VDD

Positive Supply

REFB

Reference for DAC B

OUTB

DAC B Output

s/div

MAX5237

MAJOR CARRY GLITCH

2V/div

MAX5236/7 toc28

OUT_

50mV/div

AC-COUPLED

0.50

0.25

1.25

1.00

0.75

2.00

1.75

1.50

2.25

0.50

0.25

0.75

1.00

1.25

MAX5236

FULL-SCALE OUTPUT VOLTAGE

vs. REFERENCE VOLTAGE

MAX5236/7

toc29

VREF (V)

OUT

(V)

1.0

0.5

2.5

2.0

1.5

4.0

3.5

3.0

4.5

1.0

0.5

1.5

2.0

2.5

MAX5237

FULL-SCALE OUTPUT VOLTAGE

vs. REFERENCE VOLTAGE

MAX5236/7

toc30

VREF (V)

OUT

(V)

Typical Operating Characteristics (continued)

(VDD = +5V (MAX5237) VDD = +3V (MAX5236), RL = 5k

, CL = 100pF, VREF = +1.25V (MAX5236), VREF = +2.5V (MAX5237), CREF

= 0.1F ceramic || 2.2F electrolytic, both DACs on, VOUT = full scale, TA = +25°C, unless otherwise noted.)

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