max5774 Maxim Integrated Products, Inc., max5774 Datasheet - Page 21

• Manufacturer Part Number: max5774
• Description: 32-channel, 14-bit, Voltage-output Dacs With Serial Interface
• Manufacturer: Maxim Integrated Products, Inc.

In daisy-chain operation, DOUT follows DIN after 32 clock
cycles for a write command. For a read command, DOUT
provides only the 14 data bits (and S1, S0) in the next
cycle following the C S falling edge. Data is provided MSB
first at DOUT on the falling edge of SCLK.
When SING = 1, the device is in stand-alone mode. To
reduce the time it takes to read data out, the read data
is provided MSB first at DOUT on the last 16 cycles of
the current command word. The device acts on an
Table 11. Configuration Register Data Format
X = Don’t care.
Table 12. Configuration Register Commands
ERRF
D8–D0 and
D13
DATA BIT
S1, S0
D13
D12
D11
D10
D9
SING
D12
GLT
D11
______________________________________________________________________________________
NAME
SHDN
ERRF
SING
GLT
DT
X
D10
DT
Error flag. ERRF goes logic high when an invalid command is attempted. ERRF is cleared each
time the configuration register is read back to DOUT. Reset-register commands C3–C0 = 1111
reset ERRF. Conditions that trigger ERRF include:
• Attempted read of a wrong or invalid address bits A5–A0
• Access to reserved addresses
The default is logic low (no error flags); ERRF is read only.
Single device. SING determines daisy-chain or stand-alone mode. Logic high sets the device to
operate in stand-alone mode or in parallel with other devices. Only 14 data bits (and S1, S0 = 00)
are output to DOUT when SING is logic high. When SING is logic low, the entire 32-bit command
word is output to DOUT.
The default is logic low (daisy-chain mode). For daisy-chain operation, set SING to logic low and
DSP must be set high (µC mode). SING is read/write.
Glitch-suppression enable. The MAX5773/MAX5774/MAX5775 feature glitch-suppression circuitry
on the analog outputs that minimizes the output glitch during a major carry transition. A logic low
disables the internal glitch-suppression circuitry. Logic high enables glitch suppression,
suppressing up to a 120nV-s glitch impulse on the DAC outputs. Default is logic low (glitch
suppression is disabled). GLT is read/write.
Digital output enable. A logic low enables DOUT. Logic high disables DOUT. Disabling DOUT
reduces power consumption and digital noise feedthrough to the DAC outputs from the DOUT
output buffer.
Default is logic-low (DOUT enabled); DT is read/write.
Shutdown. A logic high shuts down all 32 DACs. The logic interface remains active, and the data
is retained in the DAC and input registers. Read/write operations can be performed while the
device is shut down; however, no changes can occur at the device outputs. Logic-low powers up
all 32 DACs. Upon waking up (5µs (typ)), the DAC outputs return to the last stored value in the
DAC registers. Default is logic low (normal operation). SHDN is read/write.
Don’t care.
SHDN
D9
32-Channel, 14-Bit, Voltage-Output
D8
X
D7
X
DACs with Serial Interface
14 DATA BITS
D6
X
incoming command word independent of the rising
edge of C S. SING functionality is ignored in DSP mode.
Daisy chain any number of the MAX5773/MAX5774/
MAX5775 devices by connecting the DOUT of one
device to DIN of another. Set DSP high and SING = 0
for all devices in the daisy chain (see
D5
X
DESCRIPTION
D4
X
D3
X
D2
X
Daisy-Chain Operation
D1
X
D0
X
Figure
S1
5).
X
S0
X
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