AD5663RBRMZ-5REEL7 is a high-precision, low-power, dual-channel 16-bit nanoDAC® digital-to-analog converter (DAC) designed and manufactured by Analog Devices Inc. (ADI). It belongs to ADI’s trusted AD566xR family — a series of rail-to-rail, voltage-output DACs featuring on-chip precision reference, power-on reset, and enhanced robustness for industrial and instrumentation applications. The device integrates two matched DAC cores, a 2.5 V/2 ppm/°C internal reference, and a flexible serial interface (SPI-compatible) in a compact, thermally enhanced 10-lead MSOP package with exposed pad (BRMZ) — delivering exceptional DC accuracy, stability, and ease of use in space-constrained, high-reliability systems.
Introduction
AD5663RBRMZ-5REEL7 is a dual-channel, 16-bit, voltage-output DAC, operating from a single 2.7 V to 5.5 V supply, with true rail-to-rail output swing (0 V to VDD). Its “R” grade designation signifies enhanced performance: guaranteed ±4 LSB integral nonlinearity (INL), ±1 LSB differential nonlinearity (DNL), and ±1.5 mV maximum offset error over temperature — enabling precision closed-loop control, calibration, and biasing without external trimming. The suffix BRMZ-5REEL7 encodes key configuration and packaging details:
- B: Industrial-grade performance screening (tighter AEC/Q-level specs);
- R: MSOP-10 package;
- M: RoHS-compliant, halogen-free;
- Z: Qualified for –40°C to +105°C extended industrial temperature range;
- -5: Internal 2.5 V reference enabled (i.e., reference buffer enabled, VREFIN/VREFOUT pin configured as output);
- REEL7: 7-inch tape-and-reel packaging (1,000 units per reel), standard for automated SMT assembly.
Unlike basic DACs requiring external references or op-amps, the AD5663R integrates a low-drift, buffered 2.5 V reference (2 ppm/°C typical, 8 ppm/°C max) and features power-on reset (POR) to a known output state (zero-scale or midscale, configurable via MODE pin), ensuring safe startup in PLCs, sensor transmitters, and medical modules.
Key Features
✅ True 16-Bit Accuracy & Monotonicity: Guaranteed ±4 LSB INL, ±1 LSB DNL, and monotonic output across full scale — essential for precision control loops and metrology-grade calibration.
✅ Integrated Precision Reference: On-chip 2.5 V reference (±0.1% initial accuracy, 2 ppm/°C drift typ.) eliminates need for external reference ICs — reducing BOM cost, board area, and long-term drift uncertainty.
✅ Rail-to-Rail Output: Outputs swing from 0 V to VDD, supporting full dynamic range with low-supply systems (e.g., 3.3 V microcontrollers). Settling time: 7 µs to ±0.1% (typ.), enabling fast update rates (up to 100 kSPS).
✅ Dual Independent Channels: Two matched DACs (A & B) with separate LDAC pins — allows asynchronous or synchronous updates, ideal for dual-axis control, differential signaling, or redundant outputs.
✅ Low Power & High Efficiency: Typical supply current = 350 µA per channel (700 µA total) at 3.3 V; < 1 µA in power-down mode (1 µW standby) — suitable for battery-powered and energy-conscious designs.
✅ Robust Serial Interface: SPI-compatible 3-wire interface (SDIN, SCLK, LDAC) with 1.8 V–5.5 V logic compatibility, CRC error detection option (via optional command), and daisy-chain capability for multi-DAC systems.
✅ Enhanced Reliability Features: Includes POR to zero/midscale, glitch impulse energy < 1 nV·s, and ESD protection > 4 kV HBM — qualified per AEC-Q100 stress tests for industrial longevity.
✅ Thermally Optimized MSOP-10 Package (BRMZ): 3 mm × 3 mm footprint with exposed pad (EP) — enables low thermal resistance (< 120°C/W junction-to-board) and stable operation under sustained load.
Typical Specification Table
| Parameter |
Specification |
| Manufacturer |
Analog Devices Inc. (ADI) |
| Product Series |
AD566xR Family (nanoDAC® — Precision Voltage-Output DACs) |
| Model |
AD5663RBRMZ-5REEL7 |
| Function |
Dual-Channel, 16-Bit, Rail-to-Rail Voltage DAC |
| Resolution |
16 bits |
| Reference |
Internal 2.5 V (±0.1%, 2 ppm/°C typ., buffered) |
| Output Range |
0 V to VDD (rail-to-rail) |
| INL / DNL |
±4 LSB / ±1 LSB (guaranteed, –40°C to +105°C) |
| Offset Error |
±1.5 mV (max) |
| Gain Error |
±0.1% FSR (max) |
| Settling Time |
7 µs to ±0.1% (CL = 100 pF, RL = 10 kΩ) |
| Supply Voltage |
2.7 V to 5.5 V |
| Quiescent Current |
700 µA (typ., both channels active) |
| Power-Down Current |
< 1 µA |
| Digital Interface |
3-Wire SPI-compatible (up to 50 MHz SCLK) |
| Operating Temperature |
–40°C to +105°C (Industrial Grade) |
| Package |
10-Lead MSOP with Exposed Pad (BRMZ) |
| RoHS / Green |
Yes (Pb-free, Halogen-free) |
| Packaging |
7-inch Reel, 1,000 units (REEL7) |
Typical Applications
🔹 Industrial Process Control: Programmable current/voltage outputs (e.g., 0–20 mA, 4–20 mA, 0–10 V transmitters), valve positioners, and PID controller biasing — leveraging guaranteed monotonicity and low drift.
🔹 Automated Test Equipment (ATE): Precision stimulus generation for DUT biasing, sensor simulation, and calibration source modules — benefiting from fast settling, dual-channel sync, and integrated reference.
🔹 Medical Instrumentation: Laser diode bias control, photodiode TIA offset nulling, and patient monitor calibration — where low noise, long-term stability, and safety-critical POR behavior are mandatory.
🔹 Optical Networking & Telecom: VOAs (variable optical attenuators), pump laser current control, and RF front-end bias tuning — using rail-to-rail output and low glitch energy.
🔹 Precision Sensor Conditioning: Bridge sensor offset/gain adjustment, RTD/thermocouple cold-junction compensation, and MEMS actuator control — simplified by on-chip reference and dual DAC matching.
🔹 Embedded Calibration Systems: In-field self-calibration of data acquisition modules (e.g., calibrating ADC reference or PGA gain) — enabled by accurate, stable, and software-controllable analog outputs.
Development & Design Notes
🔧 Reference Usage & Bypassing:
- The internal 2.5 V reference is available at the VREFOUT pin (enabled by “-5” variant). Bypass VREFOUT to GND with a 10 µF X5R ceramic capacitor + 100 nF X7R in parallel, placed < 2 mm from the pin — critical for minimizing reference noise and maintaining INL spec.
- Do not connect external loads > 100 µA to VREFOUT; if higher current is needed, use an external buffer op-amp.
🔧 Output Stability & Load Driving:
- The DAC output is unity-gain stable into capacitive loads ≤ 100 pF. For larger loads (e.g., cables, filters), add a small series resistor (10–50 Ω) near the DAC pin and place a local 100 nF bypass at the load — prevents ringing and ensures monotonicity.
- Avoid routing DAC outputs parallel to high-speed digital traces; use ground guard rings to suppress crosstalk.
🔧 SPI Interface & Timing:
- Use LDAC pin for synchronous multi-DAC updates (e.g., simultaneous channel A & B output change). Tie LDAC low for immediate update, or pulse it externally for coordinated timing.
- Enable CRC mode (via command 0x90xx) in noisy environments to detect communication errors — improves system integrity in industrial EMI-prone settings.
🔧 Thermal & Layout Guidance:
- Solder the exposed pad (EP) to a ≥ 100 mm² internal ground plane using ≥ 9 thermal vias (0.3 mm diameter) — reduces θJA by ～40% and keeps TJ < 100°C even at full 5.5 V/100 kSPS operation.
- Keep AVDD and DVDD supplies independently decoupled (each with 100 nF + 10 µF) — despite internal isolation, separation prevents digital switching noise from modulating analog output.
🔧 Reliability & Safety:
- The POR circuit defaults to zero-scale (0x0000) unless MODE pin is pulled high (for midscale). Use a weak pull-down (100 kΩ) on MODE for fail-safe default behavior in safety-critical systems.
- For functional safety (IEC 61508 SIL2/3), combine with external watchdog monitoring of SPI activity and output voltage — the AD5663R supports readback of input register and power-down status for diagnostics.
