XR-2206-11-12ES
...the analog plus company
TM
XR-2206/2211/2212
Evaluation System
Rev. 1.00
5
GENERAL DESCRIPTION
This demo board is a blank printed circuit card that
simplifies design, breadboarding, and test of circuits
using the XR-2206, XR-2211, or the XR-2212. The 5.0 by
4.75 inch board can be used to build practically all of the
databook application circuits that are given for these
devices. With the exception of common power feed, each
chip and its associated passive components are
independent circuit blocks on the demo board. Therefore,
it can be assembled with any one or more of the chips
according to the user’s needs.
BOARD SCHEMATIC DIAGRAM
The schematic diagram contains separate sections for
the XR-2206, XR-2211, and the XR-2212. Circuit design
for a specific application requires using these diagrams
while referring to the appropriate circuits and equations
that are given for each device in the EXAR databook. A
breadboard section with isolated power and ground
busses is also provided for additional analog or digital
circuitry that may be required.
The purpose of this schematic is to show the circuit
capabilities for each integrated circuit. Although the
component values shown are reasonable and each of the
three devices will function properly with them, they are
provided for illustration only, and are not chosen for any
specific application. Also, all the parts that are shown may
not be required for a particular circuit since the schematic
shows everything that the board can accommodate.
COMPONENT CONSIDERATIONS
The component marking, which is 1:1 scale, gives
individuals who do not have an actual demo board an
approximate idea of component sizes.
Power, input, and output connections are made at pads
that are located close to the associated IC pin or
component. Holes for five banana jacks or binding posts
are located at the rear of the board. Two of these should
be used for power and ground, and the remaining three
can be wired to the I/O pads as needed.
The style of electrical components that the board uses
should be readily available. The potentiometers are the
inexpensive vertical-mount PC board type. Resistors are
1/4 watt and the bypass capacitors can be 0.1µF
monolithic ceramic type with radial leads spaced 0.1 inch.
The electrolytic capacitors are also vertical mount units
with 0.1 inch lead spacing. The board area provided for
the various timing capacitors should be sufficient for small
mica, polystyrene, or mylar units.
