The LTC1090 is a data acquisition component which contains a serial I/O successive approximation A/D converter. It uses LTCMOS switched capacitor technology to perform either 10-bit unipolar, or 9-bit plus sign bipolar A/D conversions. It has 4 differential/8 single ended input channels that can be configured for either single ended or differential inputs. It also includes an on-chip sample and hold circuit. The serial I/O is compatible with industry standard full duplex serial interfaces. The output data can be programmed for a length of 8, 10, 12 or 16 bits, allowing easy interface to shift registers and a variety of processors. The LTC1090A is specified with total unadjusted error less than ±0.5LSB.
The LTC1090 is a single‑chip 10‑bit data‑acquisition component that includes a successive‑approximation A/D converter, an on‑chip sample‑and‑hold, and an 8‑channel multiplexer configurable for differential or single‑ended inputs. It supports both unipolar and bipolar conversion modes and provides a programmable data word length and serial interface compatible with standard MPU ports.
The document lists key specifications such as 10‑bit resolution, 22 µs conversion time, 2.5 mA maximum supply current, and a supply voltage range up to 12 V. It also includes absolute maximum ratings, recommended operating conditions, pin descriptions, typical performance curves, package dimensions, and related part numbers.
| Resolution | 10 Bits |
|---|---|
| Supply Current (max) | 2.5 mA |
| Conversion Time | 22 µs |
| Total Unadjusted Error (LTC1090A) | +0.5 LSB Max |
| Negative Supply Voltage | -6 V to GND |
| Package Type | 20‑Lead Plastic Small Outline (Wide .300 Inch) |
The LTC1090 provides a 10‑bit resolution.
The device draws up to 2.5 mA of supply current.
A single conversion requires 22 µs.