Eight channels on a single I²C bus
The LTC2637IDE-LZ8#PBF packs eight 8-bit DACs with voltage-buffered outputs into a 14-DFN package, each channel individually addressable over a single I²C bus. That means you can set eight analog voltages — bias levels, setpoints, trim voltages — without multiplying the bus load or the board area. Settling to 8-bit accuracy in 3.5 µs typical, the part handles per-channel updates fast enough for closed-loop trim loops or dynamic bias adjustment in a multi-channel system.
Supply rails and reference flexibility
The reference can be either the internal 2.5 V bandgap or an external voltage applied to the REF pin, giving you a choice between a self-contained calibration source and a ratiometric system reference. The 14-WFDFN exposed-pad package (4x3 mm body) needs a thermal via under the pad for heat sinking if the part is driving heavy DC loads on all eight channels simultaneously. For typical trim applications the pad can be tied to ground without a via.
INL and DNL — what the numbers mean for your setpoint
Integral nonlinearity is ±0.05 LSB typical, ±0.5 LSB maximum at 8-bit resolution. That means the worst-case deviation from the ideal transfer line is half an LSB — about 20 mV on a 5 V reference. Differential nonlinearity is ±0.5 LSB max, guaranteeing monotonicity: every code step produces a positive output increment, so the DAC never skips a voltage.
Active production and compliance
It is ROHS3 compliant, so it passes the current EU restriction directive without exemption claims. For extended temperature requirements (105°C or 125°C), the AD5308ARUZ sibling runs to 125°C but uses an SPI interface and a different package.