Features

• Integrated Reference 10ppm/°C Max
• Maximum INL Error: ±4LSB
• Guaranteed Monotonic Over Temperature
• Selectable Internal or External Reference
• 2.7V to 5.5V Supply Range (LTC2657-L)
• Integrated Reference Buffers
• Ultralow Crosstalk between DACs(0.8nV•s)
• Power-On-Reset to Zero-Scale/Mid-Scale
• 400kHz I²C Interface
• Tiny 20-Lead 4mm × 5mm QFN and 20-Lead Thermally enhanced TSSOP packages

Typical Application

Description

The LTC2657 is a family of octal I2C 16-/12-Bit Rail-to- Rail DACs with Integrated 10ppm/°C Max Reference. The DACs have built-in high performance, rail-to-rail, output buffers and are guaranteed monotonic. The LTC2657-L has a full-scale output of 2.5V with the integrated reference and operates from a single 2.7V to 5.5V supply. The LTC2657-H has a full-scale output of 4.096V with the integrated reference and operates from a 4.5V to 5.5V supply. Each DAC can also operate with an external reference, which sets the full-scale output to 2 times the external reference voltage.

The parts use a 2-wire I²C compatible serial interface. The LTC2657 operates in both the standard mode (maximum clock rate of 100kHz) and the fast mode (maximum clock rate of 400kHz). The LTC2657 incorporates a power-on reset circuit that is controlled by the PORSEL pin. If PORSEL is tied to GND the DACs reset to zero-scale at power-up. If PORSEL is tied to V_CC, the DACs reset to mid-scale at power-up.