2 description – Texas Instruments THS4012 User Manual

Page 9

Description

1-3

General

1.2

Description

The TI THS4012 dual high-speed operational amplifier evaluation module
(EVM) is a complete dual high-speed amplifier circuit. It consists of the TI
THS4012 dual low-noise high-speed operational amplifier IC, along with a
small number of passive parts, mounted on a small circuit board measuring
approximately 1.9 inch by 2.2 inch (Figure 1–1). The EVM uses standard SMA
miniature RF connectors for inputs and outputs and is completely assembled,
tested, and ready to use — just connect it to power, a signal source, and a load
(if desired).

Figure 1–1. THS4012 Evaluation Module

+VCC

–VCC

GND

Vout1

SLOP230

THS4012 EVM Board

INSTRUMENTS

TEXAS

R10

R1
1

R12

R13

R14

R15

Vout2

Vin1

Vin2

Note:

The EVM is shipped with the following component locations empty: C3, C6,
R2, R4, R8, R10, R12

Although the THS4012 EVM is shipped with components installed for
dual-channel single-ended noninverting operation, it can also be configured
for single-channel differential and/or inverting operation by moving
components. Noninverting gain is set to 2 with the installed components. The
input of each channel is terminated with a 50-

Ω

impedance to provide correct

line impedance matching. The amplifier IC outputs are routed through 50-

Ω

resistors both to provide correct line impedance matching and to help isolate
capacitive loading on the outputs of the amplifier. Capacitive loading directly
on the output of the IC decreases the amplifier’s phase margin and can result
in peaking or oscillations.