Low-Power, Dual, 13-Bit Voltage-Output DACs
with Serial Interface
MAX5150/MAX5151
Table 1. Serial-Interface Programming Commands
16-BIT SERIAL WORD
A0
0
1
0
1
0
1
1
0
0
0
0
0
0
0
0
0
C1
0
0
1
1
1
0
1
0
0
0
0
0
0
0
0
0
C0
1
1
0
0
1
0
1
0
0
0
0
0
0
0
0
0
D12.......................D0
(MSB)
(LSB)
MSB
LSB
13-bit DAC data
13-bit DAC data
13-bit DAC data
13-bit DAC data
13-bit DAC data
xxxxxxxxxxxxx
xxxxxxxxxxxxx
0 0 1 x xxxxxxxxx
1 0 1 x xxxxxxxxx
1 1 0 x xxxxxxxxx
1 1 1 x xxxxxxxxx
0 1 0 x xxxxxxxxx
0 1 1 x xxxxxxxxx
1 0 0 1 xxxxxxxxx
1 0 0 0 xxxxxxxxx
0 0 0 x xxxxxxxxx
FUNCTION
Load input register A; DAC registers are unchanged.
Load input register B; DAC registers are unchanged.
Load input register A; all DAC registers are updated.
Load input register B; all DAC registers are updated.
Load all DAC registers from the shift register
(start up both DACs with new data.).
Update both DAC registers from their respective input registers
(start up both DACs with data previously stored in the input registers).
Shut down both DACs (provided
PDL
= 1).
Update DAC register A from input register A
(start up DAC A with data previously stored in input register A).
Update DAC register B from input register B
(start up DAC B with data previously stored in input register B).
Shut down DAC A (provided
PDL
= 1).
Shut down DAC B (provided
PDL
= 1).
UPO goes low (default).
UPO goes high.
Mode 1, DOUT clocked out on SCLK’s rising edge.
Mode 0, DOUT clocked out on SCLK’s falling edge (default).
No operation (NOP).
x = Don’t care
Note: When A0, C1, and C0 = 0, then D12, D11, D10, and D9 become control bits.
puts become high impedance, and the serial inter-
face
remains active. Data in the input registers is
SCLK
SK
MAX5150
MAX5151
DIN
SO
MICROWIRE
PORT
saved, allowing the MAX5150/MAX5151 to recall the
output state prior to entering shutdown when returning
to normal mode. Exit shutdown by recalling the previ-
ous condition or by updating the DAC with new infor-
mation. When returning to normal operation (exiting
shutdown), wait 20µs for output stabilization.
Serial Interface
CS
I/O
Figure 2. Connections for Microwire
10
The MAX5150/MAX5151 3-wire serial interface is com-
patible with both Microwire (Figure 2) and SPI/QSPI
(Figure 3) serial-interface standards. The 16-bit serial
input word consists of an address bit, two control bits,
and 13 bits of data (MSB to LSB) as shown in Figure 4.
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