TS1005 Op Amp Demo Board
Inverting configuration
Description
In an inverting configuration, the circuit’s transfer
function is given by the following equation:
The TS1005DB evaluation board with SC70
packaging provides one configuration, namely an
inverting configuration. The TS1005DB-SOT
ꢃ
ꢁ6
ꢄꢅꢆ = - ꢁ10
ꢃ
Iꢇ
evaluation board with SOT23 packaging provides two
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 VDD/2 for the inverting configuration and at
VDD/4 for the non-inverting configuration.
In this case, ꢁ6=1MΩ and ꢁ10=1MΩ. ꢆhis 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
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.
TS1005 demo board
DC Power Supply, Single or Dual Output
Function Generator
In both the non-inverting and the inverting
configuration, the AC-coupling capacitor creates a
high pass filter. The resulting cut-off frequency, fC, is
given as:
4-channel Oscilloscope
ꢆwo 1MΩ oscilloscope probes
1
fC=
2ꢀꢁꢂ
Non-Inverting Configuration
In order to evaluate the TS1005 operational amplifier
in the non-inverting configuration, the following steps
are to be performed:
In the non-inverting circuit, ꢁ=ꢁ5=1MΩ and
ꢂ=ꢂ5=0.1µF. In the inverting case, ꢁ=ꢁ10=1MΩ and
C=C1=0.1µF. In both cases, these component values
generate a high-pass cut-off frequency of 1.6Hz.
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.
Default Configurations
Non-Inverting configuration
In the non-inverting configuration, the circuit’s transfer
function is given by the following equation:
2) Set the function generator frequency to 500Hz
and output level with a VOH = 2.35V and a VOL
2.15V. This sets the input signal swing to
200mVPP, centered at 2.25V.
=
ꢃ
ꢄꢅꢆ
ꢁꢉ
ꢁꢊ
= 1ꢈ
ꢃ
Iꢇ
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.
With ꢁꢉ=2MΩ and ꢁꢊ=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.
4) Connect the positive terminal of the DC power
supply to VDD and the ground terminal to GND.
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TS1005DB r1p1
RTFDS
TOUCHSTONE [ TOUCHSTONE SEMICONDUCTOR INC ]
