MAX5322EAI MAXIM [Maxim Integrated Products], MAX5322EAI Datasheet - Page 13

• Manufacturer Part Number: MAX5322EAI
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX5322 dual, 12-bit DAC operates from either
single or dual analog supplies. Dual ±12V to ±15V
power supplies provide bipolar ±5V to ±10V outputs, or
unipolar 0V to 10V outputs. Single 12V to 15V analog
power supplies only provide unipolar 0 to 10V outputs.
The reference inputs accept voltages from 2V to 5.25V.
The DAC features INL and DNL less than ±1 LSB (max),
a fast 10µs settling time, and a hardware shutdown
mode that reduces current consumption to 2.8µA. The
device features a 10MHz SPI-/QSPI-/MICROWIRE-com-
patible serial interface that operates with 3V or 5V logic,
an asynchronous load input, and a serial-data output.
The device offers a CLR that sets the DAC outputs to 0V.
Figure 1 shows the functional diagram of the MAX5322.
Table 1. Control-Word Format
Table 2. Serial-Interface Programming Commands
X = Don’t care.
Note: The DACs can be programmed in shutdown mode.
MSB
C3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
C3
CONTROL BITS
±10V, Dual, 12-Bit, Serial, Voltage-Output DAC
C2
CONTROL BITS
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
16-BIT SERIAL WORD
C2
C1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
C1
C0
______________________________________________________________________________________
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Detailed Description
XXXXXXXXXXXX No operation (NOP).
12-bit DAC data
12-bit DAC data
12-bit DAC data
12-bit DAC data
12-bit DAC data
XXXXXXXXXXXX Update DAC register A from input register A (no data sent).
XXXXXXXXXXXX Update DAC register B from input register B (no data sent).
XXXXXXXXXXXX Shut down DAC A (provided SHDN = 1).
XXXXXXXXXXXX Shut down DAC B (provided SHDN = 1).
XXXXXXXXXXXX
XXXXXXXXXXXX Shut down both DACs (provided SHDN = 1).
XXXXXXXXXXXX Power up DAC A (no change to any registers).
XXXXXXXXXXXX Power up DAC B (no change to any registers).
XXXXXXXXXXXX Power up both DACs (no change to any registers).
XXXXXXXXXXXX Not used.
C0
DATA BITS
D11–D0
D11
D10
Load both DAC registers and both input registers from the shift register.
(Start both DACs with new data.)
Load input register A from the shift register; DAC registers are unchanged.
Load input register B from the shift register; DAC registers are unchanged.
Load DAC register A and input register A from the shift register.
Load DAC register B and input register B from the shift register.
Update both DAC registers from their respective input registers.
(Start both DACs with data previously stored in the input register.)
D9
D8
An SPI-/QSPI-/MICROWIRE-compatible serial interface
allows complete control of the DAC through a 16-bit
control word. The first 4 bits form the control bits that
determine register loading and software shutdown
functions. The last 12 bits form the DAC data. The 16-
bit word is entered MSB first.
Table 1 shows the serial-data control-word format.
Table 2 shows the interface commands. The MAX5322
can be programmed while in shutdown.
The serial interface contains five registers: a 16-bit shift
register, two 12-bit input registers, and two 12-bit DAC
registers (Figure 1). The shift register accepts data
from the serial interface. The input registers act as
holding registers for data going to the DAC registers
D7
DATA BITS
D6
FUNCTION
D5
D4
D3
Serial Interface
D2
D1
LSB
D0
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