Single 12-/10-/8-Bit SPI V DACs with 10ppm/°C Reference

The LTC2640 is a family of 12-, 10-, and 8-bit voltage-output DACs with an integrated, high-accuracy, low-drift reference in an 8-lead TSOT-23 package. It has a rail-to-rail output buffer that is guaranteed monotonic.

The LTC2640-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2640-H has a full-scale output of 4.096V, and operates from a 4.5V to 5.5V supply. A 10ppm/°C reference output is available at the REF pin.

Each DAC can also operate in External Reference mode, in which a voltage supplied to the REF pin sets the fullscale output.

The LTC2640 DACs use a SPI/MICROWIRE™ compatible 3-wire serial interface which operates at clock rates up to 50MHz.

The LTC2640 incorporates a power-on reset circuit. Options are available for Reset to Zero-Scale or Reset to Mid-Scale after power-up.

Applications

* Mobile Communications

* Process Control and Industrial Automation

* Automatic Test Equipment

* Portable Equipment

* Automotive

* Optical Networking

* Integrated Precision Reference

* 2.5V Full-Scale 10ppm/°C (LTC2640-L)

* 4.096V Full-Scale 10ppm/°C (LTC2640-H)

* Maximum INL Error: 1LSB (LTC2640A-12)

* Bidirectional Reference: Input or 10ppm/°C Output

* Low Noise (0.7mVpp, 0.1Hz to 200kHz)

* Guaranteed Monotonic Over Temperature

* 2.7V to 5.5V Supply Range (LTC2640-L)

* Low Power Operation: 180μA at 3V

* Power Down to 1.8μA Maximum (C and I Grades)

* Asynchronous DAC Clear Pin (LTC2640-Z)

* Power-On Reset to Zero or Mid-Scale options

* Double-Buffered Data Latches

* Guaranteed Operation from –40°C to 125°C (H-Grade)

* 8-Lead TSOT-23 (ThinSOT™) Package