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. The reference can be either the internal bandgap or an external voltage fed into the REF pin.
Temperature range and where it lands
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
No end-of-life notice is published.