QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074 LTC2630 FAMILY OF SINGLE SPI DACS LTC2630 DESCRIPTION Demonstration circuit 1074 features the LTC2630 DC1074 may be connected directly to the target ap- family of 12 bit DACs. This device establishes a new plications analog signals while using the DC590 USB benchmark for size and integration of 12 bit DACs Serial Controller board and supplied software to and onboard reference. Four DACs are included: measure performance. After evaluating with Linear Technologys software, the digital signals can be LTC2630HZ (4.096V reference, reset to zero) connected to the end applications processor / con- LTC2630HM (4.096V reference, reset to midscale) troller for development of the serial interface. LTC2630LZ (2.5V reference, reset to zero) Design files for this circuit board are available. Call the LTC factory. LTC2630LM (2.5V reference, reset to midscale) , LTC and LT are registered trademarks of Linear Technology Corpora- tion. Figure 1. Proper Measurement Equipment Setup Ribbon cable To DC590 DAC outputs Controller Table 1. LTC2630 Performance Summary, AHM / AHZ versions (Vfs = 4.096V) PARAMETER CONDITION VALUE Resolution 12 BITS Monotonicity Vcc = 5V, Vref = internal 12 BITS Differential Nonlinearity Vcc = 5V, Vref = internal +/-1 LSB Integral Nonlinearity Vcc = 5V, Vref = internal +/-0.5 LSB Typical Load Regulation Vout = Midscale, Iout = +/- 5 mA 0.1 LSB/mA 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1074 LTC2630 FAMILY OF SINGLE SPI DACS QUICK START PROCEDURE Connect DC1074 to a DC590 USB serial controller Voltage, hex code, or decimal count. Additionally, using the supplied 14 conductor ribbon cable. Con- the supply or internal reference voltage may be nect DC590 to a host PC with a standard USB A/B changed to reflect an actual measured value such cable. Run the evaluation software supplied with that the output voltage matches the theoretical out- DC590 or download it from www.linear.com. The put voltage. The reference mode may be changed correct control panel will be loaded automatically. from internal reference to supply as reference. Options are available to display the DAC output in Figure 2. Software Screenshot 2