MAX5360(2001) Просмотр технического описания (PDF) - Maxim Integrated

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MAX5360
(Rev.:2001)

Low-Cost, Low-Power 6-Bit DACs with 2-Wire Serial Interface in SOT23 Package

Maxim Integrated 

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

2-Wire Serial Interface in SOT23 Package

SDA

tSU, DAT

tLOW

tHD, DAT

SCL

tHD, STA

START CONDITION

tHIGH

tR

tF

Figure 3. Two-Wire Serial Interface Timing Diagram

tSU, STA

tHD, STA

REPEATED START CONDITION

tBUF

tSU, STO

STOP CONDITION START CONDITION

µC

SDA

SCL

SCL

VDD

RS*

MAX5360M

2V REFERENCE

SDA

OUT

VDD

OFFSET ADJUSTMENT

SCL

VDD

MAX5361N

4V REFERENCE

SDA

OUT

THRESHOLD ADJUSTMENT

SCL

VDD

MAX5362P

VDD REFERENCE

SDA

OUT

RS* IS OPTIONAL.

Figure 4. Typical Application Circuit

GAIN ADJUSTMENT

Power-On Reset

The MAX5360/MAX5361/MAX5362 have a power-on

reset circuit to set the DAC’s output to 0 when VDD is

first applied or when VDD dips below 1.7V. 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 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 10kΩ 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

as in I2C systems) to maintain compatibility with exist-

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,

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