max5712 Maxim Integrated Products, Inc., max5712 Datasheet - Page 8

• Manufacturer Part Number: max5712
• Description: Max5712 12-bit, Low-power, Rail-to-rail Voltage-output Serial Dac In Sot23
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5712 includes three software-controlled shut-
down modes that reduce the supply current to below
1µA. In two of the three shutdown modes, OUT is con-
nected to GND through a resistor. Table 1 lists the
three shutdown modes of operation.
The MAX5712 generates an output voltage proportional
to V
circuit in Figure 2 rejects this power-supply noise by
powering the device directly with a precision voltage
reference, improving overall system accuracy. The
MAX6030 (+3V, 75ppm) or the MAX6050 (+5V, 75ppm)
precision voltage references are ideal choices due to
the low-power requirements of the MAX5712. This solu-
tion is also useful when the required full-scale output
voltage is less than the available supply voltages.
12-Bit, Low-Power, Rail-to-Rail
Voltage-Output Serial DAC in SOT23
Figure 2. MAX5712 Powered By Reference
8
Table 1. Serial Interface Mapping
MSB
C3
0
1
1
1
1
_______________________________________________________________________________________
DD
, coupling power supply noise to the output. The
IN
C2
0
1
1
1
1
MAX6050
MAX6030
C1
0
1
1
1
1
Applications Information
C0
0
1
1
1
1
GND
OUT
D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00
X
X
X
X
Device Powered by an
X
X
X
X
External Reference
16-BIT SERIAL WORD
Shutdown Modes
X
X
X
X
MAX5712
X
X
X
X
GND
V
DD
X
X
X
X
12-Bit DAC Code
OUT
X
X
X
X
X
X
X
X
X
X
X
X
The 3-wire digital interface for the MAX5712 is compati-
ble with SPI, QSPI, MICROWIRE, and DSP. The three
digital inputs (CS, DIN, and SCLK) load the digital input
serially into the DAC. All of the digital inputs include
Schmitt-trigger buffers to accept slow-transition inter-
faces. This allows optocouplers to interface directly to
the MAX5712 without additional external logic. The digi-
tal inputs are compatible with CMOS-logic levels.
Careful PC board layout is important for optimal system
performance. Keep analog and digital signals separate
to reduce noise injection and digital feedthrough. Use a
ground plane to ensure that the ground return from
GND to the supply ground is short and low impedance.
Bypass V
as possible to the device.
TRANSISTOR COUNT: 3856
PROCESS: BiCMOS
X
X
X
X
TOP VIEW
X
X
X
X
Power-Supply Bypassing and Layout
DD
Digital Inputs and Interface Logic
with a 0.1µF capacitor to ground as close
0
0
1
1
LSB
GND
0
1
0
1
V
DIN
DD
1
2
3
Set and update
Power-Down
Power-Down
Power-Down
Wake-Up
MAX5712
SOT23
MODE
DAC
Pin Configuration
Chip Information
4
6
5
setting (initially 0)
OUT
CS
SCLK
100kΩ to GND
V
Current DAC
1kΩ to GND
CODE/4096
OUT
OUTPUT
Floating
= V
DD
x