MAX5500(2008) データシートの表示（PDF） - Maxim Integrated

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MAX5500
(Rev.:2008)

Low-Power, Quad, 12-Bit Voltage-Output DACs with Serial Interface

Maxim Integrated 

Low-Power, Quad, 12-Bit

Voltage-Output DACs with Serial Interface

CS

SCLK

DIN

DOUT

(MODE 0)

DOUT

(MODE 1)

COMMAND

EXECUTED

1

8

9

16

A1

A0 C1 C0 D11 D10 D9 D8 D7

D6 D5 D4 D3 D2 D1 D0

DATA PACKET (N)

A1

A0 C1 C0 D11 D10 D9 D8 D7

D6 D5 D4 D3 D2 D1 D0 A1

MSB FROM

PREVIOUS WRITE

DATA PACKET (N-1)

DATA PACKET (N)

A1 A0 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 A1

MSB FROM

PREVIOUS WRITE

DATA PACKET (N-1)

DATA PACKET (N)

Figure 5. Serial-Interface Timing Diagram

CS

SCLK

DIN

DOUT

tCSO

tCSS

tDS tDH

tCH

tCL

tCSW

tCP

tCSH

tCS1

tDO1 tDO2

Figure 6. Detailed Serial-Interface Timing Diagram

Power-Down Lockout (PDL)

Drive power-down lockout, PDL, low to disable software

shutdown. When in shutdown, transitioning PDL from

high to low wakes up the device with the output set to

the state prior to shutdown. Use PDL to asynchronously

wake up the device.

Daisy Chaining Devices

The MAX5500/MAX5501 can be daisy chained by con-

necting DOUT of one device to DIN of another device

(Figure 7).

Each DOUT output of the MAX5500/MAX5501 includes

an internal active pullup. The sink/source capability of

DOUT determines the time required to discharge/charge

a capacitive load. See the serial-data-out VOH and VOL

specifications in the Electrical Characteristics.

Figure 8 shows an alternate method of connecting sev-

eral MAX5500/MAX5501 devices. In this configuration,

the data bus is common to all devices. Data is not shift-

ed through a daisy chain. More I/O lines are required in

this configuration because a dedicated chip-select

input (CS) is required for each IC.

10 ______________________________________________________________________________________

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