User manual

page 14
Analog System Lab Kit PRO
introduction
Getting to know ASLK PRO
The Analog System Lab kit ASLK PRO is divided into many sections. Refer to the photo of ASLK PRO when you read the following description.
There are three TL082 OP-Amp ICs labelled 1, 2, 3 on ASLK PRO. Each of these
ICshastwoampliers,whicharelabelledAandB.Thus1Aand1Barethetwo
OP-AMps on OP-AMP IC 1, etc. The six OP-amps are categorized as below.
1
4
5
6
7
8
9
10
2
3
OP-Amp Type Purpose
1A TYPE I InvertingCongurationonly
1B TYPE I InvertingCongurationonly
2A TYPE II FullConguration
2B TYPE II FullConguration
3A TYPE III BasicConguration
3B TYPE III BasicConguration
Thus, the OP-amps are marked TYPE I, TYPE II and TYPE III on the board. The
OP-AmpsmarkedTYPEIcanbeconnectedintheinvertingcongurationonly.
With the help of connectors, either resistors or capacitors can be used in the
feedback loop of the amplier. There are two such TYPE I ampliers. There
aretwoTYPEIIamplierswhichcanbeconguredtoactasinvertingornon-
inverting.Finally,wehavetwoTYPEIIIamplierswhichcanbeusedasvoltage
buers.
Three analog multipliers are included in the kit. These are wide-bandwidth
precision analog multipliers from Texas Instruments (MPY634). Each
multiplier is a 14-pin IC and operates on internally provided ±10V supply.
There are two digital-to-analog converters (DAC) provided in the
kit, labeled DAC I and DAC II. Both the DACs are DAC7821 from Texas
Instruments. They are 12-bit, parallel-input multiplying DACs which can be
used in place of analog multipliers in circuits like AGC/AVC. Ground and power
supplies are provided internally to the DAC. DAC Logic Supply Jumper can
be used to connect logic power supplies of both DAC I and DAC II to either
LDO or DC/DC converter located on the board. Using Tri-state switches you
can set 12-bits of input data for each DAC to desired value. Click the Latch
Data button to trigger Digital-to-analog conversion.
We have included a wide-input non-synchronous DC/DC buck
converter TPS40200 from Texas Instruments on ASLK PRO. The
converter provides an output of 3.3V over a wide input range
of 5.5-15V at output currents ranging from 0.125A to 2.5A.
Using Vout SEL jumper you can select output voltage to be either 5V or
3.3V. Another jumper allows you to select whether input voltage is provided
from the board (+10V), or externally using screw terminals.
We have included two transistor sockets on the board, which are needed in
designing an LDO regulator (Experiment 10), or custom experiments.
A specialized LDO regulator IC (TPS7250) has been included on the
board, which can provide a constant output voltage for input voltage ranging
from 5.5V to 11V. Ground connection is internally provided to the IC. Using
ON/OFF jumper you can enable or disable LDO IC. Another jumper allows
you to select whether input voltage is provided from the board (+10V), or
externally using screw terminals.
There are two 1kX trimmers (potentiometer) in the kit to enable the designer
to obtain a variable voltage if needed for a circuit. The potentiometers are
labeled P1 and P2. These operate respectively in the range 0V to +10V, and
-10V to 0V.
The kit has a screw terminals to connect ±10V power supply. All the
ICs on the board are internally connected to power supply. Please refer to
Appendix D for schematics of ASLK PRO.
We have included two diode sockets on the board, which can be used as
rectiersincustomlaboratoryexperiments.
The top right portion of the kit is a general-purpose area which can be
used as a proto-board. ± 10V points and GND are provided for this area.