Reflex DAC - 14 Bit 2MSPS +/- 4.096V Range

Reflex DAC product features:
--> Real ± output — Op amp bipolar summing stage provides –4.096 V to +4.096 V full-scale voltage output

--> Fast without the fuss — 2 MSPS with standard SPI. In controlled setups, you can over clock it toward ~3 MSPS with reduced amplitude output swing

--> Great analog voltage accuracy — On-board precision 4.096 V reference, low-noise analog path, and power noise filtering for rock-solid, low-drift output.

--> Reference your way — Use the on-board precision reference or feed your own external reference; the board exposes both options cleanly.

--> Single-supply simplicity — Runs from one 5 V supply; the board generates the negative rail internally for bipolar output and filters supply noise before it touches your analog signal.

--> Flexible digital I/O — digital circuit power auto-selects: use the main 5 V, or plug in an optional 2.7–5.0 V digital supply and it routes itself—no jumpers to remember.

--> Design includes shorting pad at the output if you want to terminate the output at 1 Mohms (connects 1Mohm resistor between the output and ground)

--> The Relex DAC includes some analog signal reconstruction filtering on the signal's output path (C24 and C25), pop these caps off to get the full slew rate speed of the DAC or increase their value (150pF for instance) to get smoother analog transitions between points (see tutorial for more details)

--> Open-source everything — Schematics, PCB, and example Ardfuino firmware so you can learn, adapt, and ship.

General performance specifications:
--> Resolution / topo: 14-bit monotonic
--> Full-scale range (FSR): ±4.096 V (span = 8.192V)
--> Max specified DAC update rate: up to 2 MSPS
--> SPI interface: 3-wire, up to 50 MHz SCLK (device-rated maximum). Can over clock, see tutorial.
--> SPI interface only requires three pins: SCK, COPI, and CS. No data is read from the DAC so no CIPO connection

Reflex DAC turn on behavior:
--> At turn on the DAC defaults to a code of 0 which results in a max negative voltage value, with on board reference this would be -4.096V
--> If you want it power on at 0V, pull the SREF pin high at turn on. Then adjust the DAC code to mid scale (0V) and then remove the high logic from the SREF pin.
--> Note that the SREF pin uses a pull down resistors so it does not need to actively be pulled low

Analog accuracy (uncalibrated, 25 °C ):
--> Reflex DAC LSB size (14-bit, ±4.096 V FS): 0.5 mV/LSB (FS span = 8.192 V → 1 LSB ≈ 0.0061% FS)
--> System output accuracy — uncalibrated, 25 °C (typical): ±8 LSB (±4.0 mV) ≈ ±0.049% FS
--> System output accuracy — after Two-Point Calibration technique (typical): ±2 LSB (±1.0 mV) ≈ ±0.012% FS. See tutorial section for more information on Two-Point Calibration method for DACs

Drive capability & loading capability of output amplifier:
--> Max output current (source/sink): ±75 mA class (typical);
--> Recommended use at ≤ ±50 mA for lowest error and best op amp performance across specified temperature range

Reference options:
--> On-board precision 4.096V reference: enabled by default. Serves as reference to DAC and also used to bias op amp stage to create -4.096 voltage output range
--> Internal reference can be used external but limit current draw to no more than 5mA
--> An external reference ranging from 2V to 5V can be used, needs to support source and sink currents up to 2mA. Pull the SREF pin high if you are using an external reference
--> Note that -/+ 5V is the power rail voltage of the op amps so if a 5V external reference is used the output will start to clip at around +/- 4.9V or +/- 4.8V depending on the load
--> Note that the external voltage reference will set the output voltage range = +/- external reference voltage

Power & logic:
--> Power in (Vin): single +5 V input, with max current draw of xxxmA. If you use less than 4.8V for Vin, output voltage range of DAC may drop in voltage
--> Digital power: auto-detects whether to use Vin or if separate digital power input (VDIG) is present. Digital voltage input 2.7–5.0 V, max current 5mA
--> Note digital input voltage sets the digital logic level of the SPI communication

Form factor (see tutorial section for pin descriptions):
--> Dimensions: 44.5 mm x 33 mm
--> Mounting holes: 3.5 mm diameter
--> Pin headers: 2.54 mm spacing
Startup behavior: safe initialization code examples provided (ensures near-0 V output at power-on before user commands)

Texas Instruments DAC8801IDGKT DAC IC Datasheet: https://www.ti.com/lit/ds/symlink/dac8801.pdf?ts=1753573788474&ref_url=https%253A%252F%252Fwww.mouser.com%252F

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