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 opera-
tion 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 cir-
cuit 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
