Datasheet

Evaluation Schematic
1-2
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-V to dual supply
±7.5-V 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+, and the Vin- to Vout connection (see
Figure 4-1—the vias provide the impedance)
- 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).
- Power PADt heatsinking capability.
- A good example of high-speed amplifier PCB design and layout.
Figure 1-1. Schematic of the THS4211EVM-UG Unity Gain
J6
GND
Vs-
+
C2
R6
+
C1
FB1
R7
Vs+
J2
Vin+
FB2
Vs-
C3
J5
Vs+
C4
100 pF
-
+
U1
THS4211
2
3
6
7
4
R4
TP1
J4
Vout
J7
Vs-
Vs+
C6C5
100 pF
49.9 W
453 W
49.9 W
0.1 mF
22 mF
22 mF
0.1 mF