THS4524MDBTREP datasheet(24/48 Pages) NSC

24 / 48 page

THS452x

24.9 W

953 W

1kW

49.9 W

24.9 W

OCM

IN+

Measurewith

Differential

Probe

AcrossR

Installedto

Balance

Amplifier

Calibrated

Differential

Probe

Across

Open

From

50-

Source

S+

S-

0.22 F

THS4524-EP

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

www.ti.com

TEST CIRCUITS

Ω input termination.

Overview

Table 2. Load Component Values For 1:1

The THS4524 is tested with the test circuits shown in

Differential to Single-Ended Output Transformer(1)

this section; all circuits are built using the available

ROT

Atten

THS4524 evaluation module (EVM). For simplicity,

100

Ω

24.9

Ω

Open

6 dB

power-supply decoupling is not shown; see the layout

200

Ω

86.6

Ω

69.8

Ω

16.8 dB

in the Applications section for recommendations.

Depending on the test conditions, component values

499

Ω

237

Ω

56.2

Ω

25.5 dB

change in accordance with Table 1 and Table 2, or

1 k

Ω

487

Ω

52.3

Ω

31.8 dB

as otherwise noted. In some cases the signal

1. Total load includes 50-

Ω termination by the test

generators used are ac-coupled and in others they

equipment. Components are chosen to achieve

dc-coupled 50-

Ω sources. To balance the amplifier

load and 50-

Ω line termination through a 1:1

when ac-coupled, a 0.22-

μF capacitor and 49.9-Ω

transformer.

resistor to ground are inserted across RIT on the

alternate input; when dc-coupled, only the 49.9-

Ω

Frequency Response

resistor to ground is added across RIT. A split power

supply is used to ease the interface to common test

The circuit shown in Figure 54 is used to measure the

equipment, but the amplifier can be operated in a

frequency response of the circuit.

single-supply

configuration

described

the

An HP network analyzer is used as the signal source

Applications section with no impact on performance.

and the measurement device. The output impedance

Also, for most of the tests, except as noted, the

of the HP network analyzer is is dc-coupled and is

devices are tested with single-ended inputs and a

Ω. RIT and RG are chosen to impedance-match to

transformer on the output to convert the differential

Ω and maintain the proper gain. To balance the

output to single-ended because common lab test

amplifier, a 49.9-

Ω resistor to ground is inserted

equipment has single-ended inputs and outputs.

across RIT on the alternate input.

Similar or better performance can be expected with

differential inputs and outputs.

The output is probed using a Tektronix high-

impedance

differential

probe

across

the

953-

Ω

As a result of the voltage divider on the output formed

resistor and referred to the amplifier output by adding

by the load component values, the amplifier output is

back the 0.42-dB because of the voltage divider on

attenuated. The Atten column in Table 2 shows the

the output.

attenuation expected from the resistor divider. When

using a transformer at the output (as shown in

Figure 55), the signal sees slightly more loss because

of transformer and line loss; these numbers are

approximate.

Table 1. Gain Component Values for

Single-Ended Input(1)

Gain

RIT

1 V/V

1 k

Ω

1 k

Ω

52.3

Ω

2 V/V

1 k

Ω

487

Ω

53.6

Ω

5 V/V

1 k

Ω

187

Ω

59.0

Ω

10 V/V

1 k

Ω

86.6

Ω

69.8

Ω

1. Gain setting includes 50-

Ω source impedance.

Figure 54. Frequency Response Test Circuit

Components are chosen to achieve gain and 50-

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