DEMO MANUAL DC1337A LTC2309 8-Channel, 12-Bit SAR ADC 2 with I C Interface Description Demonstration circuit 1337A features the LTC 2309, a performance of the LTC2309 can be evaluated directly in low noise, low power, 8-channel, 12-bit, successive ap- that circuit. 2 proximation ADC with an I C compatible serial interface. Design files for this circuit board are available at The LTC2309 is available in a 24-pin 4mm 4mm QFN DEMO MANUAL DC1337A Quick s tart p D Connect the DC1337 to a QuikEval controller using the The Help menu contains information on data logging the supplied 14-conductor ribbon cable. Make sure the ADC results. The Tools menu has the data logging option VCCIO jumper of the QuikEval controller is in the 5V as well as options for changing the number of points dis- position. Connect the QuikEval controller to a host PC with played, the number of points in an average and whether a standard USB A/B cable. Apply an analog input voltage the data is displayed in LSBs or Volts. The View menu can to CH0-CH7 on connector J1. Run the evaluation software be used to access the LTC2309 product page. supplied with the QuikEval controller or download it from If the QuikEval program is started without the demo board www.linear.com/software. The correct control panel will attached to the QuikEval controller, the Tools menu can be be loaded automatically. Click the Collect (Figure 2) but- used to check for updates and automatically install them. ton to begin reading CH0-CH3. Press the Page 1 Button DC1337 requires at least version K71 of the QuikEval to toggle to Page 2. This displays CH4-CH7. This button software. toggles between the two displays. h Dware s Signal Connections Turrets J1 Connector for CH0-CH7, COM and BIAS/2. Limit input EXT BIAS External Bias connection. This can be used voltage swings to GND-VDD. For optimum performance, the to drive the BIAS/2 line through a 2:1 divider. To use this input should be bandlimited to the frequencies of interest. pin put jumper J6 in the EXT position and apply desired bias voltage. 2 Jumper J2 AD0 I C address line. Set to GND for operation with supplied software. For operation without QuikEval, 5V 5V supply line for the DC1337. Use this line only if the configure as desired: Low (GND), High (5V) or Float (FLT) QuikEval controller is not used 2 Jumper J3 AD1 I C address line. Set to GND for operation GND Ground line for the DC1337 with supplied software. For operation without QuikEval, 2 SDA I C bidirectional data line. Controlled by the QuikEval configure as desired: Low (GND), High (5V) or Float (FLT) controller if connected. Jumper J4 COM Common pin for single ended ADC 2 SCL I C clock line. Controlled by the QuikEval controller conversions. Can be set to GND or left floating (FLT) so if connected. that COM can be driven by J1. VREF Connected to ADC V pin. REF J5 QuikEval interface connector. Provides power and I2C REFCOMP Connected to ADC REFCOMP pin. interface to the DC1337. BIAS/2 Bias Voltage/2 (REFCOMP or EXT) Jumper J6 BIAS Selects between REFCOMP and an external bias voltage to drive the Bias/2 line. Bias/2 is designed to set a center point for the minus input during bipolar operation. dc1337af 2 etup ar ure roce