The LTC1594/LTC1598 are micropower, 12-bit sampling A/D converters that feature 4- and 8-channel multiplexers, respectively. They typically draw only 320µA of supply current when converting and automatically power down to a typical supply current of 1nA between conversions. The LTC1594 is available in a 16-pin SO package and the LTC1598 is packaged in a 24-pin SSOP. Both operate on a 5V supply. The 12-bit, switched-capacitor, successive approximation ADCs include a sample-and-hold. On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three or four wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers. The circuit can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.
The LTC1594 and LTC1598 are micropower, 12‑bit analog‑to‑digital converters featuring 4‑channel (LTC1594) or 8‑channel (LTC1598) multiplexers. They operate from a single 5 V supply, draw only 320 µA typical during conversion, and auto‑shutdown to 1 nA between samples, making them ideal for battery‑operated and remote data‑acquisition systems.
The devices provide flexible serial interfaces (SPI, QSPI, Microwire) and include detailed pin‑function descriptions, absolute maximum ratings, recommended operating conditions, and package dimensions for both the 16‑lead SO (LTC1594) and 24‑lead SSOP (LTC1598) options.
| Typical Supply Current | 320 µA |
|---|---|
| Auto‑Shutdown Current | 1 nA |
| Supply Voltage Range | 4.5 V – 5.5 V |
| Maximum Clock Frequency | 320 kHz |
The devices draw about 320 µA of supply current during conversion.
LTC1594 is offered in a 16‑lead narrow SO package, while LTC1598 is available in a 24‑lead SSOP package.
The ADCs automatically power down to a typical current of 1 nA between conversions.