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

2-Wire Serial Interface in SOT23 Package

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9

Power-On Reset

The MAX5360/MAX5361/MAX5362 have a power-on

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 typically

<50mV.

Shutdown Mode

The MAX5360/MAX5361/MAX5362 include a software-

controlled shutdown mode that reduces the supply cur-

rent to <1µA. All internal circuitry is disabled and an

internal 10k

Ω resistor is placed from OUT to GND to

ensure 0V at OUT while in shutdown. The device enters

shutdown in less than 5µs and exits shutdown in less

than 50µs.

Digital Section

Serial interface

The MAX5360/MAX5361/MAX5362 use a simple two-

wire serial interface requiring only two I/O lines (two-

wire bus) of a standard microprocessor (µP) port.

Figure 3 shows the timing diagram for signals on the 2-

wire bus.

The two bus lines (SDA and SCL) must be high when

the bus is not in use. The MAX5360/MAX5361/

MAX5362 are receive-only devices (slaves) and must

be controlled by a bus master device. Figure 4 shows a

typical application where multiple devices can be con-

nected to the bus provided they have different address

settings. External pullup resistors are not necessary on

these lines (when driven by push-pull drivers), though

the MAX5360/MAX5361/MAX5362 can be used in

applications where pullup resistors are required (such

ing circuitry. The serial interface operates at SCL rates

up to 400kHz. The SDA state is allowed to change only

while SCL is low, with the exception of START and

STOP conditions as shown in Figure 5. Each transmis-

sion consists of a START condition sent by the bus

master device, followed by the MAX5360/MAX5361/

MAX5362’s preset slave address, a power-mode bit,

SCL

SDA

START CONDITION

STOP CONDITION

REPEATED START CONDITION

START CONDITION

Figure 3. Two-Wire Serial Interface Timing Diagram

µC

SDA

SCL

OFFSET ADJUSTMENT

THRESHOLD ADJUSTMENT

GAIN ADJUSTMENT

SCL

SDA

OUT

MAX5360M

2V REFERENCE

SCL

SDA

OUT

MAX5361N

4V REFERENCE

SCL

SDA

OUT

MAX5362P

Figure 4. Typical Application Circuit