Datasheet

MAX5500/MAX5501
Low-Power, Quad, 12-Bit
Voltage-Output DACs with Serial Interface
10 ______________________________________________________________________________________
CS
SCLK
DIN
DOUT
(MODE 1)
MSB FROM
PREVIOUS WRITE
MSB FROM
PREVIOUS WRITE
COMMAND
EXECUTED
9
8
16
1
A0
A1 D0
C1
C0
D11
D10
D9
D6
D5
D4
D3
D2
D1
D8
D7
DOUT
(MODE 0)
A0
A1 D0 A1
C1
C0
D11
D10
D9
D6
D5
D4
D3
D2
D1
D8
D7
A0
A1 D0 A1
C1
C0
D11
D10
D9
D6
D5
D4
D3
D2
D1
D8
D7
DATA PACKET (N)
DATA PACKET (N-1)
DATA PACKET (N)
DATA PACKET (N-1)
DATA PACKET (N)
Figure 5. Serial-Interface Timing Diagram
SCLK
DIN
DOUT
t
CSO
t
CSS
t
CL
t
CH
t
CP
t
DO1
t
CSW
t
CS1
t
DO2
t
CSH
t
DS
t
DH
CS
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 V
OH
and V
OL
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.