Texas Instruments THS3115 EVM, Руководство пользователя

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Description
1-2
1.1 Description
The THS3115/25 EVM provides a platform for developing high-speed CFA
application circuits. It contains the THS3115/25 high-speed CFA, a number of
passive components, and various features and footprints that enable the user
to experiment, test, and verify various operational amplifier circuit
implementations. The PC board measures 3.52 by 2.81 inches.
1.2 Evaluation Module Features
THS3115/25 high-speed operational amplifier EVM features include:
-
Wide operating supply voltage range: dual supply
±
5 to
±1
5 Vdc operation
(see the device data sheet).
-
Unity gain inverting stage (channel 1 of the IC). The user can reconfigure
gain as required.
-
Noninverting stage with a gain of 2 (channel 2 of the IC). The user can
reconfigure gain as required.
-
Nominal 50-
W
input termination resistors (R2 and R8). Termination can be
configured according to the application requirement.
-
Nominal 50-
W,
1 watt output matching resistors (R5B and R11B). Foot-
prints are provided for lower power resistors (R5A and R11A).
-
100-
W,
1 watt output load resistors (R6B and R12B). Footprints are
provided for lower power resistors (R6A and R12A).
-
Shut down (SD) pin control, J10
-
Power supply ripple rejection capacitors (C1 and C2)
-
Decoupling capacitors (C3, C4) populated with 0.1-
m
F capacitors. Design
final decoupling in accordance with SLOA069
-
A good example of high-speed amplifier PCB design and layout
1.3 THS3115/25 EVM Operating Conditions
-
Supply voltage range,
±
VS
±
5 V to
±
15 V (see the device data sheet)
-
Supply current, IS (see the device data sheet)
-
Output drive, I
O
, at VS =
±
15 (see the device data sheet)
For complete THS3115/25 amplifier IC specifications, parameter
measurement information, and additional application information, see the
THS3115/25 data sheet, TI literature number SLOS382.
1.4 EVM Default Configuration
As delivered, the EVM has a fully functional example circuit, just add power
supplies, a signal source, and monitoring instrument. See Figure 1--1 for the
default schematic diagram. The user can change the gain by changing the
ratios of the feedback and gain resistors (see the device data sheet for
recommended resistor values). The complete EVM schematic—showing all
component locations—is shown in Chapter 5.