configurations for evaluating the TS1005 operational
amplifier in one single PCB board, namely a non-
inverting configuration located on the left-hand side of
the board and an inverting configuration located on
the right-hand side of the board. In both cases, the
input to each circuit is AC-coupled. The demo board
provides a re-biasing scheme at one-half the power
supply or V
DD
/2 for the inverting configuration and at
V
DD
/4 for the non-inverting configuration.
The TS1005 demo board provides a dedicated power
supply for the non-inverting circuit and a dedicated
power supply for the inverting circuit. This provides
the user the flexibility of evaluating one circuit at a
time or both at the same time.
In both the non-inverting and the inverting
configuration, the AC-coupling capacitor creates a
high pass filter. The resulting cut-off frequency, f
C
, is
given as:
f
C
=
1
2πRC
Inverting configuration
In an inverting configuration, the circuit’s transfer
function is given by the following equation:
V
OUT
V
IN
R6
R10
=
-
In this case, R6=1MΩ and R10=1MΩ. This results in
a signal gain of -1 with a circuit bandwidth of 10kHz
and an overall circuit bandwidth range of 1.6Hz to
10kHz.
Quick Start Procedures
Required Equipment
TS1005 demo board
DC Power Supply, Single or Dual Output
Function Generator
4-channel Oscilloscope
Two 1MΩ oscilloscope probes
In the non-inverting circuit, R=R5=1MΩ and
C=C5=0.1µF. In the inverting case, R=R10=1MΩ and
C=C1=0.1µF. In both cases, these component values
generate a high-pass cut-off frequency of 1.6Hz.
Non-Inverting Configuration
In order to evaluate the TS1005 operational amplifier
in the non-inverting configuration, the following steps
are to be performed:
1) Before connecting the DC power supply to the
demo board power test points, turn on the power
supply and set the DC voltage to 5.5V and then
turn it off.
2) Set the function generator frequency to 500Hz
and output level with a V
OH
= 2.35V and a V
OL
=
2.15V. This sets the input signal swing to
200mV
PP
, centered at 2.25V.
3) In order to monitor the input and output signal,
select two channels on the oscilloscope and set
the vertical voltage scale and the vertical position
on each channel to 100mV/DIV and -2.25V,
respectively. Set the horizontal time scale to
500µs/DIV.
4) Connect the positive terminal of the DC power
supply to V
DD
and the ground terminal to GND.
Default Configurations
Non-Inverting configuration
In the non-inverting configuration, the circuit’s transfer
function is given by the following equation:
V
OUT
V
IN
R4
R3
=
1+
With R4=2MΩ and R3=2MΩ the circuit signal gain is
2 with a circuit bandwidth of 10kHz. This results in an
overall circuit bandwidth range of 1.6Hz to 10kHz.
Page 2
TS1005-EVB Rev. 1.0
TS1005 Demo Board
5) Connect the signal output of the function
generator to V
in
and the ground terminal to GND.
6) To monitor the input, connect the signal terminal
of one of the oscilloscope probes to V
in
and the
ground terminal to GND. To monitor the output,
use the second probe to connect the signal
terminal to V
OUT
and the ground terminal to GND.
7) Turn on the power supply and check that the
power supply current is approximately 4.3µA.
8) Turn on the function generator.
9) Observe the input and output signal. The output
signal is an amplified version of the input signal
with an output swing of approximately 400mV
PP
,
corresponding to a signal gain of two.
6) To monitor the input, connect the signal terminal
of one of the oscilloscope probes to V
in
and the
ground terminal to GND. To monitor the output,
use the second probe to connect the signal
terminal to V
OUT
and the ground terminal to GND.
7) Turn on the power supply and check that the
power supply current is approximately 3.8µA.
8) Turn on the function generator.
9) Observe the input and output signal. The output
signal is an inverted version of the input signal
and the swing should be 200mV
PP
.
3) In order to monitor the input and output signal,
select two channels on the oscilloscope and set
the vertical voltage scale and the vertical position
on each channel to 100mV/DIV and -2.25V,
respectively. Set the horizontal time scale to
500µs/DIV.
4) Connect the positive terminal of the DC power
supply to VDD and the ground terminal to GND.
5) Connect the signal output of the function
generator to V
in
and the ground terminal to GND.
Inverting Configuration
In order to evaluate the TS1005 operational amplifier
in the inverting configuration, the following steps are
to be performed:
1) Before connecting the DC power supply to the
demo board, turn on the power supply and set
the DC voltage to 5.5V and then turn it off.
2) Set the function generator output frequency to
500Hz and output level with a V
OH
= 2.35V and a
V
OL
= 2.15V. This sets the input swing to
200mV
PP
, centered at 2.25V.
Figure 3. Non-Inverting Configuration
Figure 4. Inverting Configuration
TS1005-EVB Rev. 1.0
Page 3
TS1005 Demo Board
Figure 5. TS1005 Demo Board
Top Layer #1
Figure 6. TS1005 Demo Board
Top Layer #2
Figure 7. TS1005 Demo Board
Bottom Layer (GND) #1
Figure 8. TS1005 Demo Board
Bottom Layer (GND) #2
Silicon Laboratories, Inc.
400 West Cesar Chavez, Austin, TX 78701
+1 (512) 416-8500
▪
www.silabs.com
Page 4
TS1005-EVB Rev. 1.0
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Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific
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