MAX5250BEAP+ Maxim Integrated Products, MAX5250BEAP+ Datasheet - Page 10

• Manufacturer Part Number: MAX5250BEAP+
• Description: IC DAC 10BIT QUAD 5V LP 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5250BEAP+

• Settling Time: 10µs
• Number Of Bits: 10
• Data Interface: Serial
• Number Of Converters: 4
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°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: + 85 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 640 mW
• Minimum Operating Temperature: - 40 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

Figure 5 shows the serial-interface timing requirements.
The chip-select pin (CS) must be low to enable the
DAC’s serial interface. When CS is high, the interface
control circuitry is disabled. CS must go low at least
t
erly clock in the first bit. When CS is low, data is
clocked into the internal shift register through the serial-
data input pin (DIN) on SCLK’s rising edge. The maxi-
mum guaranteed clock frequency is 10MHz. Data is
latched into the appropriate MAX5250 input/DAC regis-
ters on CS’s rising edge.
The programming command Load-All-DACs-From-Shift-
Register allows all input and DAC registers to be simul-
taneously loaded with the same digital code from the
input shift register. The no operation (NOP) command
leaves the register contents unaffected and is useful
when the MAX5250 is configured in a daisy chain (see
the Daisy Chaining Devices section). The command to
Low-Power, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
Table 1. Serial-Interface Programming Commands
“X” = Don’t care
10
CSS
A1
0
0
1
1
0
0
1
1
0
1
1
0
0
0
1
1
______________________________________________________________________________________
before the rising serial clock (SCLK) edge to prop-
A0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
C1
0
0
0
0
1
1
1
1
0
0
0
1
1
0
1
1
16-BIT SERIAL WORD
C0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
MSB.............LSB
D9.................D0
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
10-bit DAC data
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
S1
0
0
0
0
0
0
0
0
X
0
X
X
X
X
X
X
S0
0
0
0
0
0
0
0
0
X
0
X
X
X
X
X
X
Load input register A; DAC registers unchanged.
Load input register B; DAC registers unchanged.
Load input register C; DAC registers unchanged.
Load input register D; DAC registers unchanged.
Load input register A; all DAC registers updated.
Load input register B; all DAC registers updated.
Load input register C; all DAC registers updated.
Load input register D; all DAC registers updated.
Update all DAC registers from their respective input registers (also exit
shutdown mode).
Load all DAC registers from shift register (also exit shutdown mode).
Enter shutdown mode (provided PDL = 1).
UPO goes low (default).
UPO goes high.
No operation (NOP) to DAC registers
Mode 1, DOUT clocked out on SCLK’s rising edge. All DAC registers
updated.
Mode 0, DOUT clocked out on SCLK’s falling edge. All DAC registers
updated (default).
change the clock edge on which serial data is shifted
out of DOUT also loads data from all input registers to
their respective DAC registers.
The serial-data output, DOUT, is the internal shift regis-
ter’s output. The MAX5250 can be programmed so that
data is clocked out of DOUT on SCLK’s rising edge
(Mode 1) or falling edge (Mode 0). In Mode 0, output
data at DOUT lags input data at DIN by 16.5 clock
cycles, maintaining compatibility with MICROWIRE,
SPI/QSPI, and other serial interfaces. In Mode 1, output
data lags input data by 16 clock cycles. On power-up,
DOUT defaults to Mode 0 timing.
The user-programmable logic output, UPO, allows an
external device to be controlled through the MAX5250
serial interface (Table 1).
User-Programmable Logic Output (UPO)
FUNCTION
Serial-Data Output (DOUT)