The LTC®2499 is a 16-channel (eight differential), 24-bit, No Latency DSTM ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme elimi- nates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and rail-to-rail input signals to be directly digitized while maintaining exceptional DC accuracy. The LTC2499 includes a high accuracy, temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combi- nations of 16 analog input channels operating in single- ended or differential modes) or its internal temperature sensor. The integrated temperature sensor offers 1/30th °C resolution and 2°C absolute accuracy. The LTC2499 allows a wide common mode input range (0V to VCC), independent of the reference voltage. Any combination of single-ended or differential inputs can be selected and the first conversion, after a new channel is selected, is valid. Access to the multiplexer output en- ables optional external amplifiers to be shared between all analog inputs and auto calibration continuously removes their associated offset and drift.
The LTC2499 ADC provides up to eight differential or sixteen single‑ended inputs and features Easy Drive™ technology that enables rail‑to‑rail input operation with zero differential input current. It includes a high‑accuracy on‑chip temperature sensor and an internal oscillator, allowing direct digitization of high‑impedance sensors while maintaining excellent DC accuracy.
Typical applications include direct sensor digitization, temperature measurement, instrumentation, and industrial process control. The device operates from a single 2.7 V to 5.5 V supply, consumes only 0.8 mW, and is offered in a compact 38‑lead plastic QFN package (5 mm × 7 mm).
| Input Channels | Up to 8 differential or 16 single‑ended |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Power Consumption | 0.8 mW (single supply operation) |
| Noise | 600 nV RMS |
| Integral Nonlinearity (INL) | 2 ppm, no missing codes |
| Offset Error | 1 ppm |
| Package | 38‑lead Plastic QFN (5 mm × 7 mm) |
The device operates from 2.7 V up to 5.5 V.
It supports up to eight differential or sixteen single‑ended inputs.
The ADC achieves 600 nV RMS noise.