Rainbow-electronics MAX5365 Manual do Utilizador descarregar pdf (Página 8)

combination of resistive loads >10kΩ and capacitive

loads <50pF.

Power-On Reset

The MAX5363/MAX5364/MAX5365 have a power-on

reset circuit to set the DAC’s output to 0 when V

first applied or when V

dips below 1.7V (typ). This

ensures that unwanted DAC output voltages will not

occur immediately following a system startup, such as

after a loss of power. The output glitch on startup is typ-

ically less than 50mV.

Shutdown Mode

The MAX5363/MAX5364/MAX5365 include three soft-

ware-controlled shutdown modes that reduce the supply

current to <1µA. All internal circuitry is disabled, and a

known impedance is placed from OUT to GND to

ensure 0V while in shutdown. Table 2 details the three

shutdown modes of operation.

Digital Section

3-Wire Serial Interface

The MAX5363/MAX5364/MAX5365s’ digital interface is

a standard 3-wire connection compatible with

SPI/QSPI/MICROWIRE interfaces. The chip-select input

(CS) frames the serial data loading at the data-input pin

(DIN). Immediately following CS’s high-to-low transition,

the data is shifted synchronously and latched into the

input register on the rising edge of the serial clock input

(SCLK). After 16 bits have been loaded into the serial

MAX5363/MAX5364/MAX5365

Low-Cost, Low-Power, 6-Bit DACs with 3-Wire

Serial Interface in SOT23

8 _______________________________________________________________________________________

REF

CONTROL LOGIC

DATA LATCH

GND

OUT

CURRENT-STEERING

DAC

SERIAL INPUT REGISTERSCLK

DIN

MAX5363

MAX5364

MAX5365

Figure 1. Functional Diagram

SW1 SW2 SW63

OUT

REF

Figure 2. Current-Steering DAC Topology

OUTPUT VOLTAGE

DAC CODE

[D11–D6]

MAX5363 MAX5364 MAX5365

111 111

× (63/64)

0.9

× V

(63/64)

100 000 1V 2V 0.9 × V

/ 2

000 001 31mV 63mV 0.9 × V

/ 64

000 000 0 0 0

Table 1. Unipolar Code Output Voltage

1 2 3 4 5 6 7 8 9 10 11 12

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