Datasheet

1-1
Introduction and Description
Introduction and Description
This EVM provides a platform for testing the THS4211 and THS4215 in 8-pin
MSOP (DGN) and 8-pin LLP (DRB) with and without power down. 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.
If the user wants to evaluate a unity gain noninverting buffer, that configuration
is not recommended with this EVM. The user needs to obtain a THS4211 unity
gain EVM, THS4211EVM-UG. See Section 3.2.
1.1 Evaluation Schematic
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 a
complete schematic diagram. EVM features include:
- Wide operating supply voltage range: single supply 4.5 Vdc to dual supply
±7.5 Vdc operation (see the device data sheet). Single supply operation
is obtained by connecting both J6 (GND) and J7 (VS-) to ground.
- Nominal 50-Ω input impedance (R4). Termination can be configured
according to the application requirement.
- 50-Ω impedance traces on Vin-, Vin+, and Vout (see Figure 4-1—the vias
provide the impedance)
- Power-down input for the THS4215 (J9).
- Power-down reference for the THS4215 can be changed by removing R1
and supplying the desired reference level to J8.
- Convenient GND test point (TP1).
- 453-Ω series matching resistor (R6)—produces a 500-Ω load in
combination with resistor R7. 500 Ω is the standard data sheet load
impedance.
- Power supply ripple rejection capacitors (C1 and C2).
- Decoupling capacitors (C3, C4, C5, C6).
- PowerPADt heatsinking capability.
- User customizable/configurable component choice.
- A good example of high-speed amplifier PCB design and layout.
Chapter 1