MAX5250ACAP+ Maxim Integrated Products, MAX5250ACAP+ Datasheet - Page 9

• Manufacturer Part Number: MAX5250ACAP+
• Description: IC DAC 10BIT QUAD 5V LP 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5250ACAP+

• Settling Time: 10µs
• Number Of Bits: 10
• Data Interface: Serial
• Number Of Converters: 4
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Number Of Dac Outputs: 4
• Resolution: 10 bit
• Interface Type: Serial (SPI)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 640 mW
• Minimum Operating Temperature: 0 C
• Supply Current: 850 uA
• Voltage Reference: External
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

In power-down mode, the MAX5250 output amplifiers
and the reference inputs enter a high-impedance state.
The serial interface remains active. Data in the input
registers is retained in power-down, allowing the
MAX5250 to recall the output states prior to entering
shutdown. Start up from power-down either by recalling
the previous configuration or by updating the DACs
with new data. When powering up the device or bring-
ing it out of shutdown, allow 15µs for the outputs to
stabilize.
The MAX5250’s 3-wire serial interface is compatible
with both MICROWIRE (Figure 2) and SPI/QSPI
(Figure 3). The serial input word consists of two address
bits and two control bits followed by 10+2 data bits
(MSB first), as shown in Figure 4. The 4-bit address/
control code determines the MAX5250’s response out-
lined in Table 1. The connection between DOUT and
the serial-interface port is not necessary, but may be
used for data echo. Data held in the MAX5250’s shift
register can be shifted out of DOUT and returned to the
microprocessor (µP) for data verification.
The MAX5250’s digital inputs are double buffered.
Depending on the command issued through the serial
interface, the input register(s) can be loaded without
affecting the DAC register(s), the DAC register(s) can
be loaded directly, or all four DAC registers can be
updated simultaneously from the input registers
(Table 1).
The MAX5250 requires 16 bits of serial data. Table 1
lists the serial-interface programming commands. For
certain commands, the 10+2 data bits are “don’t
cares.” Data is sent MSB first and can be sent in two
8-bit packets or one 16-bit word (CS must remain low
until 16 bits are transferred). The serial data is com-
posed of two DAC address bits (A1, A0) and two con-
trol bits (C1, C0), followed by the 10+2 data bits
D9…D0, S1, S0 (Figure 4). Set both sub-bits (S1, S0) to
zero. The 4-bit address/control code determines:
• The register(s) to be updated
• The clock edge on which data is to be clocked out
• The state of the user-programmable logic output
• If the part is to go into shutdown mode (assuming
• How the part is configured when coming out of shut-
through the serial-data output (DOUT)
(UPO)
PDL is high)
down mode.
Low-Power, Quad, 10-Bit Voltage-Output DAC
Serial-Interface Configurations
_______________________________________________________________________________________
Serial-Interface Description
Figure 2. Connections for Microwire
Figure 3. Connections for SPI/QSPI
Figure 4. Serial-Data Format
MSB ..................................................................................LSB
Address
A1
*THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX5250,
*THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX5250,
BUT CAN BE USED FOR READBACK PURPOSES.
BUT CAN BE USED FOR READBACK PURPOSES.
Bits
Control Bits
4 Address/
with Serial Interface
A0
MAX5250
MAX5250
C1
Control
Bits
DOUT*
DOUT*
C0
SCLK
SCLK
DIN
DIN
CS
16 Bits of Serial Data
CS
MSB ..................................LSB
D9 .....................................D0, S1, S0
10+2 Data Bits
CPOL = 0, CPHA = 0
Data Bits
MISO*
MOSI
SCK
I/O
SK
SO
SI*
I/O
MICROWIRE
SPI/QSPI
PORT
PORT
+5V
SS
9