The LTC1257 is a complete single supply, 12-bit voltage output D/A converter (DAC) in an SO-8 package from Linear Technology Corporation. The LTC1257 includes an output buffer amplifier, 2.048V voltage reference and an easy to use three-wire cascadable serial interface. An external reference can be used to override the internal reference and extend the output voltage range to 12V. The power supply current is a low 350µA when operating from a 5V supply, making the LTC1257 ideal for battery-powered applications. The space-saving 8-pin SO package and operation with no external components provide the smallest 12-bit D/A system available.
The LTC1257 is a complete single‑supply, 12‑bit voltage‑output DAC offered in an 8‑pin SO‑8 package. It includes an internal 2.048 V reference, a buffered output stage, and a three‑wire cascaded serial interface, making it suitable for battery‑powered and space‑constrained designs. The device operates from a wide supply range (4.75 V to 15.75 V) and draws low current (typical 350 µA at 5 V).
The datasheet details absolute maximum ratings, electrical characteristics, pin assignments, timing diagrams, and typical performance graphs. It also describes typical applications such as daisy‑chained DAC arrays and external‑reference configurations, along with mechanical package dimensions for PCB layout.
| Resolution | 12 bits |
|---|---|
| Typical Supply Current (5 V) | 350 µA |
| Internal Reference Voltage | 2.048 V |
| Gain Error | 0.5 + 2 LSB |
| Maximum Clock Frequency | 14 MHz |
| Output Current Capability | 2 mA source |
The device provides a 12‑bit resolution.
The maximum clocking rate for the serial interface is 14 MHz.
It includes a built‑in 2.048 V reference.