DC1684A-A

DC1684A-A demonstration circuit features the LTC®2758A 18bit SoftSpan™ IOUT DAC. The digital interface is a simple, 4-wire Serial Peripheral Interface (SPI), augmented with separate active-low CLEAR and active-low LDAC pins that reset the output to zero and load the DAC code, respectively. This device features six output ranges: 0V to 5V, 0V to 10V, ±5V, ±10V, ±2.5V, and –2.5V to 7.5V. These ranges are programmable through the SPI interface or through separate span control pins if SoftSpan operation is not needed. Voltage input offset and gain adjustment pins facilitate trimming of residual DC errors without impacting the excellent temperature stability of this device.

• Uses LT®1468 amplifiers recommended for 16-bit applications
• Uses low noise, low offset LT1012A amplifiers for reference inversion, and composite amplifier