12-Bit – 4-Channel SPI V-OUT DAC
- Rajkumar Sharma
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- SKU: EL157610
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Digital-to-analog converters (DACs) provide accurate output voltages for actuation and control in many electronic applications such as industrial, medical, and RF systems. The MAX5715 is a highly accurate, four-channel, 12-bit voltage output DAC. Development with DACs involves expertise in analog systems, power supplies, digital interfaces, and firmware. Now, the MAX5715 module is introduced to accelerate the development process. This module helps for rapid prototyping and development with the MAX5715 (a 12-bit, 4-channel, voltage-output DAC). DAC module interfaces to any Arduino-compatible or embed-compatible platform system with expansion ports configurable for SPI communication. The board directly interfaces to SPI with logic levels in the range of 2.7V to 5.5V.
The MAX5715 4-channel, low-power, 12-bit, voltage-output digital-to-analog converter (DACs) includes output buffers and an internal reference that is selectable to be 2.048V, 2.500V, or 4.096V. The MAX5715 accepts a wide supply voltage range of 2.7V to 5.5V with extremely low power (3mW) consumption to accommodate most low-voltage applications. A precision external reference input allows rail-to-rail operation and presents a 100kΩ (typ) load to an external reference.
The MAX5715 has a 50MHz 3-wire SPI/QSPI™/MICROWIRE®/DSP-compatible serial interface that also includes an active-low RDY output for daisy-chain applications. The DAC output is buffered and has a low supply current of less than 250µA per channel and a low offset error of ±0.5mV (typ). On power-up, the MAX5715 reset the DAC outputs to zero, providing additional safety for applications that drive valves or other transducers that need to be off on power-up. The internal reference is initially powered down to allow the use of an external reference. The MAX5715 allows simultaneous output updates using software LOAD commands or the hardware load DAC logic input (active-low LDAC). A clear logic input (active-low CLR) allows the contents of the CODE and the DAC registers to be cleared asynchronously and sets the DAC outputs to zero.
Features
- Wide 2.7V to 5.5V Supply Range
- Separate 1.8V to 5.5V VDDIO Power-Supply Input
- 50MHz 3-Wire SPI/QSPI/MICROWIRE/DSP-Compatible Serial Interface with Active-Low RDY Output
- Power-On-Reset to Zero-Scale DAC Output
- Active-Low LDAC and Active-Low CLR For Asynchronous Control
- Three Software-Selectable Power-Down Output Impedances,1kΩ, 100kΩ, or High Impedance
- PCB Dimensions 23.50 x 21.91 mm
Four High-Accuracy DAC Channels
- 12-Bit Accuracy Without Adjustment
- ±1 LSB INL Buffered Voltage Output
- Monotonic Over All Operating Conditions
- Independent Mode Settings for Each DAC
Three Precision Selectable Internal References
- 048V, 2.500V, or 4.096V
Internal Output Buffer
- Rail-to-Rail Operation with External Reference
- 5µs Settling Time
- Outputs Directly Drives 2kΩ Loads
Applications
- Automatic Tuning
- Communication Systems
- Data Acquisition
- Gain and Offset Adjustments
- Portable Instrumentation
- Power Amplifier Controls
- Process Control and Servo Loops
- Programmable Voltage and Current Sources
Connections
- CN1 DAC Output Side: Pin 1 = VDD, Pin 2 = Output D, Pin 3 = Output C, Pin 4 = Output B, Pin 5 = Output A, Pin 6 = Reference, Pin 7 = GND
- CN1 Digital Interface: Pin 1 = VDD-I/O, Pin 2 = Reference, Pin 3 = LDAC, Pin 4 = CLR, Pin 5 = CS, Pin 6 = SCLK, Pin 7 = MOSI, Pin 8 = MISO, Pin 9 = GND
- D1: Power LED VDD-I/O
Schematic
Parts List
NO | QNTY. | REF. | DESC | MANUFACTURER | SUPPLIER | SUPPLIER PART NO |
---|---|---|---|---|---|---|
1 | 1 | CN1 | 7 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5320-ND |
2 | 1 | CN2 | 9 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5322-ND |
3 | 5 | C1,C2,C4,C5,C7 | 100nF/50V CERAMIC SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
4 | 2 | C3,C6 | 10uF/25V CERAMIC SMD SIZE 0804 | YAGEO/MURATA | DIGIKEY | |
5 | 1 | D1 | LED SMD SIZE 0805 | OSRAM | DIGIKEY | 475-1278-1-ND |
6 | 2 | L1,L2 | FERRITE-BEAD 600OHMS SMD SIZE 0805 | LAIRD | DIGIKEY | 240-2390-1-ND |
7 | 1 | R1 | 1K 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
8 | 2 | R2,R3 | 3K 5% SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
9 | 4 | R4,R5,R6,R7 | 0E SMD SIZE 0805 | YAGEO/MURATA | DIGIKEY | |
10 | 1 | U1 | MAX5715 14TSSOP | ANALOG DEVICE | DIGIKEY | MAX5715BAUD+TCT-ND |
Connections
Block Diagram
Sample Application
SPI Timing Diagram