MAX5384EUT-T 데이터 시트보기 (PDF) - Maxim Integrated

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MAX5384EUT-T

Low-Cost, Low-Power, 8-Bit DACs with 3-Wire Serial Interface in SOT23

Maxim Integrated 

Low-Cost, Low-Power, 8-Bit DACs with 3-Wire

Serial Interface in SOT23

Typical Operating Characteristics (continued)

(VDD = +3.0V (MAX5383), VDD = +5.0V (MAX5384/MAX5385), TA = +25°C, unless otherwise noted.)

MAX5383

OUTPUT SETTLING

1LSB STEP UP

MAX5383

OUTPUT SETTLING

1LSB STEP DOWN

OUT

20mV/div

AC-COUPLED

OUT

20mV/div

AC-COUPLED

CS

3V/div

2µs/div

0 x 7F TO 0 x 80

CS

3V/div

2µs/div

0 x 80 TO 0 x 7F

Pin Description

PIN

NAME

DESCRIPTION

1

OUT DAC Voltage Output

2

GND Ground

3

VDD

Power-Supply Input

4

DIN

Serial Data Input

5

SCLK Serial Clock Input

6

CS

Chip-Select Input

Detailed Description

The MAX5383/MAX5384/MAX5385 voltage-output, 8-bit

DACs ensure monotonic performance by offering full 8-

bit performance with less than 1LSB integral nonlineari-

ty error and less than 1LSB differential nonlinearity

error. The devices use a simple 3-wire, SPI/QSPI/

MICROWIRE-compatible serial interface that operates

up to 10MHz. They include an internal reference, an

output buffer, and three low-current shutdown modes,

making these devices ideal for low-power, highly inte-

grated applications. Figure 1 shows the devices’ func-

tional diagram.

Analog Section

The MAX5383/MAX5384/MAX5385 employ a current-

steering DAC topology as shown in Figure 2. At the

core of the DAC is a reference voltage-to-current con-

verter (V/I) that generates a reference current. This cur-

rent is mirrored to 255 equally weighted current

sources. DAC switches control the outputs of these cur-

rent mirrors so that only the desired fraction of the total

current-mirror currents is steered to the DAC output.

The current is then converted to a voltage across a

resistor, and this voltage is buffered by the output

buffer amplifier.

Output Voltage

Table 1 shows the relationship between the DAC code

and the analog output voltage. The 8-bit DAC code is

binary unipolar with 1LSB = (VREF/256). The MAX5383/

MAX5384 have a full-scale output voltage of (+2V - 1LSB)

and (+4V - 1LSB), set by the internal references. The

MAX5385 has a full-scale output voltage of (0.9 ✕ VDD -

1LSB).

Output Buffer

The DAC voltage output is an internally buffered unity-

gain follower that slews up to ±0.4V/µs. The output can

swing from 0 to full scale. With a 1/4FS to 3/4FS output

transition, the amplifier outputs typically settle to

1/2LSB in less than 5µs when loaded with 10kΩ in par-

allel with 50pF. The buffer amplifiers are stable with any

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