Using the THS4082 EVM With Differential Inputs
1-14
General
1.8
Using the THS4082 EVM With Differential Inputs
The THS4082 EVM operates from power-supply voltages ranging from
±
5 V
to
±
15 V. Move resistors on the board as detailed above for either noninverting
or inverting operation to configure the EVM for differential input operation.
Signal inputs on the module are terminated for 50-
Ω
nominal source
impedance. An oscilloscope is typically used to view and analyze the EVM
output signal.
1) Ensure that all power supplies are set to OFF before making power supply
connections to the THS4082 EVM.
2) Connect the power supply ground to the module terminal block (J2)
location marked GND.
3) Select the operating voltage for the EVM and connect appropriate split
power supplies to the module terminal block (J2) locations marked –VCC
and +VCC.
4) Connect an oscilloscope across the module SMA output connectors
(J3
and J5) through a 50-
Ω
nominal impedance cable (an oscilloscope having
a 50-
Ω
input termination is preferred for examining very high frequency
signals).
5) Set the power supply to ON.
6) Connect the differential signal input across the module SMA input connec-
tors
(J1 and J4).
Note:
The differential EVM input is terminated with an equivalent 50-
Ω
impedance
for each input. With a 50-
Ω
source impedance, the voltage seen by the
THS4082 amplifier IC on the module will be 1/2 the source signal voltage ap-
plied to the EVM. This is due to the voltage division between the source im-
pedance and the EVM equivalent input resistance.
7) Verify the differential output signal on the oscilloscope.
Note:
The signal shown on an oscilloscope with a 50-
Ω
input impedance will be 1/4
the actual THS4082 amplifier IC output voltage. This is due to the voltage
division between the output resistors (R7, R15) and the oscilloscope input
impedance.
1.9
THS4082 EVM Specifications
Supply voltage range,
±
V
CC
±
5 V to
±
15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, I
CC
7 mA typ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
±
VCC, max
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output drive, I
O
65 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For complete THS4082 amplifier IC specifications, parameter measurement
information, and additional application information, see the THS4082 data
sheet, TI literature number SLOS274.
Summary of Contents for THS4082
Page 1: ...September 2000 Mixed Signal Products User s Guide SLOU075...
Page 4: ...iv...
Page 26: ...1 20 General...
Page 31: ...THS4082 EVM Board Layouts 2 5 Reference Figure 2 3 THS4082 EVM PC Board Layout Component Side...
Page 32: ...THS4082 EVM Board Layouts 2 6 Reference Figure 2 4 THS4082 EVM PC Board Layout Back Side...