DC104B-B

DC104B LTC1068CG, LTC1068-200CG LTC1068-25CG, LTC1068-50CG SWITCHED CAPACITOR DEMONSTRATION CIRCUIT: USERS GUIDE DESCRIPTION DC104 is a surface mount printed circuit board for the evaluation of Li-near Technology’s LTC1068 product family in a 28-lead SSOP package. The LTC1068 product family consists of four monolithic clock-tunable filter building blocks. Demo Board 104 is available in four assembled versions: All DC104 boards are assembled with input, output and power supply test terminals, a 28-lead SSOP filter device (LTC1068CG Series), a dual op amp in an SO-8 for input or output buffers and decoupling capacitors for the filter and op amps. The filter and dual op amps share the power supply inputs to the board. Jumpers JPA to JPD on the board con-figure the filter’s second order circuit modes, jumper JP1 configures the filter for dual or single supply operation and jumpers JP2 (A-D) to JP3 (A-D) configure the op amp buffers as inverting or non-inverting. Surface mount pads are available on the board for 1206 size surface mount resistors. The printed circuit layout of Assembly 104-A features the low noise LTC1068CG (clock-to-center frequency ratio = 100), assembly 104-B features the low noise LTC1068-200CG (clock-to-center frequency ratio = 200), assembly 104-C features the high frequency LTC1068-25CG (clock-to-center frequency ratio = 25) and assembly 104-D features the low power LTC1068-50CG (clock-to-center frequency ratio = DC104 is arranged so that most of the resistor 50). connections for one 8th order filter or two 4th order filters are available on the board. A resistor makes a connection between two filter nodes on the board and for most filter designs, no wiring is required. Linear Technology Corporation DC104B Schematic (See Datasheet) Linear Technology Corporation