MAX5156BEEE View Datasheet(PDF) - Maxim Integrated
Part Name
Description
MFG CO.
MAX5156BEEE Datasheet PDF : 16 Pages
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Low-Power, Dual, 12-Bit Voltage-Output DACs
with Configurable Outputs
Table 1. Serial-Interface Programming Commands
16-BIT SERIAL WORD
A0 C1 C0
D11................D0
MSB
LSB
S0
FUNCTION
001
101
010
110
011
12 bits of DAC data
12 bits of DAC data
12 bits of DAC data
12 bits of DAC data
12 bits of DAC data
0
Load input register A; DAC register is unchanged.
0
Load input register B; DAC register is unchanged.
0
Load input register A; all DAC registers are updated.
0
Load input register B; all DAC registers are updated.
0
Load all DAC registers from the shift register (start up both DACs
with new data).
100
111
000
000
000
000
000
000
000
000
000
xxxxxxxxxxxx
xxxxxxxxxxxx
0 0 1 x xxxxxxxx
1 0 1 x xxxxxxxx
1 1 0 x xxxxxxxx
1 1 1 x xxxxxxxx
0 1 0 x xxxxxxxx
0 1 1 x xxxxxxxx
1 0 0 1 xxxxxxxx
1 0 0 0 xxxxxxxx
0 0 0 x xxxxxxxx
Update both DAC registers from their respective input registers
0
(start up both DACs with data previously stored in the input
registers).
0
Shut down both DACs if PDL = 1.
0
Update DAC register A from input register A (start up DAC A with
data previously stored in input register A).
0
Update DAC register B from input register B (start up DAC B with
data previously stored in input register B).
0
Shut down DAC A when PDL = 1.
0
Shut down DAC B when PDL = 1.
0
UPO goes low (default).
0
UPO goes high.
0
Mode 1, DOUT clocked out on SCLK’s rising edge.
0
Mode 0, DOUT clocked out on SCLK’s falling edge (default).
0
No operation (NOP).
“x” = don’t care
Note: D11, D10, D9, and D8 become control bits when A0, C1, and C0 = 0. S0 is a sub bit, always zero.
Power-Down Mode
The MAX5156/MAX5157 feature a software-program-
mable shutdown mode that reduces the typical supply
current to 2µA. The two DACs can be shut down inde-
pendently or simultaneously by using the appropriate
programming word. For instance, enter shutdown mode
(for both DACs) by writing an input control word of
111XXXXXXXXXXXX0 (Table 1). In shutdown mode, the
reference inputs and amplifier outputs become high
impedance, and the serial interface remains active.
Data in the input registers is saved, allowing the
MAX5156/MAX5157 to recall the output state prior to
entering shutdown when returning to normal mode. Exit
shutdown by recalling the previous condition or by
updating the DAC with new information. When returning
to normal operation (exiting shutdown), wait 20µs for
output stabilization.
Serial Interface
The MAX5156/MAX5157 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,
12 bits of data (MSB to LSB), and one sub bit as shown
in Figure 4. The address and control bits determine the
response of the MAX5156/MAX5157, as outlined in
Table 1.
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