8-bit I2C DAC for precision trim and set-point control
The AD5602BKSZ-2REEL7 is an 8-bit voltage-output DAC from Analog Devices' nanoDAC series, packing a single buffered output channel with an I2C serial interface into a 6-lead SC-70 package. The internal architecture is a string DAC, which gives monotonic performance by design — the output voltage always increases as the digital code increments, no missing codes to chase at the 8-bit level. Settling time to ±0.5 LSB is 10 µs typical, fast enough for most closed-loop trim and bias-adjustment loops running at sub-100 kHz update rates.
Accuracy and output drive — what the ±0.5 LSB INL buys you
Integral nonlinearity is ±0.5 LSB maximum, and differential nonlinearity is ±1 LSB maximum — at 8 bits (256 steps over a 2.5 V reference, for example), that ±0.5 LSB INL means the output lands within about 5 mV of the ideal transfer function. For a power-supply margining DAC or a laser-diode bias setpoint, that is tight enough to skip a calibration step in production. The output is a rail-to-rail buffered voltage — it swings from near ground to near the supply rail without an external op-amp. The supply voltage also serves as the reference (reference type: supply), so the full-scale output tracks the supply. If the system's 3.3 V rail drifts, the DAC output drifts proportionally; for ratiometric applications this is fine, but for an absolute voltage reference you would add an external reference ahead of the supply pin.
SC-70-6 package — board-fit constraints
The SC-70-6 (SOT-363) footprint measures 2.0 mm × 1.25 mm with a 0.65 mm pin pitch — small enough to fit under a BGA shadow or on a dense mixed-signal board edge. The part is surface-mount only, so no through-hole adapter needed for prototype builds; the reel packaging (Tape & Reel; Cut Tape) suits both hand-assembly and high-volume pick-and-place.