Datasheet

1-1
Introduction and Description
Introduction and Description
This EVM provides a platform for testing the THS4226 in the 10-pin MSOP
(DGQ) package. It contains the high-speed op amp, a number of passive
components, and various features and footprints that enable the user to
experiment, test, and verify various operational amplifier circuit
implementations.
1.1 Evaluation Schematic
As delivered, the EVM has a fully functional example circuitjust add power
supplies, a signal source, and monitoring instrument. See Figure 11 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 EVM includes the following features:
- Wide operating supply voltage range: dual supply ±1.35 V to dual supply
±7.5 V operation (see the device data sheet). Single supply operation is
obtained by connecting both J8 (GND) and J7 (VS) to ground. Operating
supply voltage range for single supply is 2.7 V to 15 V.
- Convenient GND test point (TP1)
- Power supply ripple rejection provided by inductors FB1 and FB2 followed
by tantalum capacitors C5 and C6
- Decoupling capacitors, C7 and C8, populated with 0.1 µF and capacitors,
C3 and C4, populated with 100 pFdesign final decoupling in accordance
with SLOA069
- Nominal 50- input impedance for each of the configured inputs, V1in,
V1in+ and V2in+. Termination can be configured according to the
application requirement.
- A good example of high-speed amplifier PCB design and layout. Also see
High-Speed Amplifier PCB Layout Tips, SLOA102.
- 50-input matching resistors (R3 and R10)
- 453- resistors along with the 49.9- resistors to ground provide
minimum load of 500 on EVM channel 1 and channel 2 respectively.
- User customizable / configurable component choice
- Nominal 50- signal traces for input and outputs to reduce signal
reflections within this board
Chapter 1