MAX5156AEEE+T Maxim Integrated Products, MAX5156AEEE+T Datasheet - Page 10

• Manufacturer Part Number: MAX5156AEEE+T
• Description: IC DAC 12BIT DUAL LP SER 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5156AEEE+T

• Settling Time: 15µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 667mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Low-Power, Dual, 12-Bit Voltage-Output DACs
with Configurable Outputs
Table 1. Serial-Interface Programming Commands
“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.
10
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
16-BIT SERIAL WORD
D 1 1 . . . . . . . . . . . . . . . . D 0
MSB
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
1 0 0 1 xxxxxxxx
1 0 0 0 xxxxxxxx
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
0 0 0 x xxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx
Power-Down Mode
LSB
S0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Load input register A; DAC register is unchanged.
Load input register B; DAC register is 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 if 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 when PDL = 1.
Shut down DAC B when 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).
updating the DAC with new information. When returning
to normal operation (exiting shutdown), wait 20µs for
output stabilization.
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.
FUNCTION
Serial Interface