1 MHz VFC with ±0.012% linearity — the precision signal-chain fit
The AD7740KRMZ-REEL7 is a voltage-to-frequency converter from Analog Devices, built around a charge-balancing architecture that delivers ±0.012% linearity at a 1 MHz maximum output frequency. That linearity figure is the spec that decides conversion accuracy — it means the output pulse train tracks the input voltage within 120 ppm of full scale, which is tight enough for 12-bit-equivalent A/D conversion without an external ADC. The full-scale drift is ±50 ppm/°C, so the gain error shifts by less than 0.005% over a 10 °C change. For a panel that sees 25 °C to 55 °C ambient, the drift stays under 0.15% without a temperature compensation routine.
8-MSOP footprint and reflow reality
The part comes in an 8-MSOP package (3.00 mm body width, 0.65 mm pitch), surface-mount only. The supplier device package is 8-MSOP — same as the MSOP-8 footprint in most CAD libraries. Check the MSL before you place it; the evidence doesn't carry an MSL rating, but the 8-MSOP body is thin enough that a standard 260 °C reflow profile with a 30-second above-liquidus soak should clear the joints without tombstoning, provided the pad geometry matches the recommended land pattern. It ships in tape and reel (7-inch reel, 3000 pieces per reel typical for this package family), so it feeds directly into a pick-and-place without a tray changeover.