The LTC1966 is a precision micropower, ∆Σ RMS-to-DC converter. It features no-hassle simplicity, high accuracy, high linearity, low supply current, ultralow shutdown current, constant bandwidth, flexible supplies, flexible inputs, flexible output, and small size.
The LTC1966 provides true RMS‑to‑DC conversion using an innovative delta‑sigma (DS) technique. It accepts single‑ended or differential inputs, offers rail‑to‑rail common‑mode range, and features high linearity (0.02 % typical) and gain accuracy (0.1 % from 50 Hz to 1 kHz). Its low‑power design delivers a typical supply current of 155 mA and an ultralow shutdown current of 0.1 mA.
Electrical characteristics include a supply voltage range of 2.7 V to 5.5 V (single) or up to –5.5 V (dual), output offset voltage as low as 0.1 mV, and a wide bandwidth up to 800 kHz. The device is supplied in an 8‑lead MSOP package and is suited for portable instrumentation, panel meters, and other precision measurement applications.
| Supply Voltage Range (single supply) | 2.7 V to 5.5 V |
|---|---|
| Supply Voltage Range (dual supply) | Up to –5.5 V |
| Typical Supply Current | 155 mA typ, 170 mA max |
| Shutdown Current | 0.1 mA |
| Gain Accuracy | 0.1 % from 50 Hz to 1 kHz |
| Linearity Error | 0.02 % typical |
The ultralow shutdown current is 0.1 mA.
It operates from 2.7 V to 5.5 V on a single supply or up to –5.5 V on a dual supply.
The gain accuracy is 0.1 % from 50 Hz to 1 kHz.
Typical supply current is 155 mA, with a maximum of 170 mA.