Four 12-bit DACs in a 3x3 mm QFN
The LTC2635HUD-LMO12#PBF from Analog Devices packs four 12-bit voltage-output DACs into a 16-QFN package measuring 3x3 mm. Each channel settles to within 1 LSB in 4.4 µs typical, which is fast enough for closed-loop trim loops or multi-channel set-point control without waiting on the bus. The I²C interface keeps the pin count low — four analog outputs plus the serial bus and a reference pin. Supply range runs from 2.7 V to 5.5 V on both the analog and digital rails. The reference can be either the internal bandgap or an external voltage fed into the REF pin.
Temperature range and where it lands
Rated for -40°C to 125°C, this is the H-grade version — it lives comfortably in engine-bay electronics, industrial oven controls, or outdoor telecom gear where the ambient inside the enclosure hits triple digits. The 16-QFN with exposed pad helps pull heat into the PCB ground plane.
Linearity and monotonicity
INL and DNL are both ±1 LSB maximum. That guarantees monotonicity across the full 12-bit range — every code step produces a positive voltage increment. For trim applications (power supply margining, VCO tuning, laser bias) this matters more than absolute accuracy; you need to know the output moves the right direction every time.
Sourcing and lifecycle note
Status is Active per the manufacturer, and the part carries ROHS3 compliance. No end-of-life notice is published.