THS4501CDG4 datasheet(26/48 Pages) TI1

26 / 48 page

VOCM

15V

0.1 mF

THS4500/2

VDD

VOD =26VPP

RISO

VOCM

12-Bit/80MSPS

5 V

10 mF

0.1 mF

10 mF

0.1 mF

THS4503

1 mF

0.1 mF

ADS5410

RISO

VOCM

14-Bit/40MSPS

5 V

10 mF

0.1 mF

THS4501

1 mF

ADS5421

0.1 mF

RISO

RG1

RF1

RF2

RISO

CF2

CF1

RG2

RISO

THS4500

THS4501

SLOS350F

– APRIL 2002 – REVISED OCTOBER 2011

www.ti.com

Figure 104. Fully Differential Line Driver With

High Output Swing

Figure 102. Using the THS4503 With the ADS5410

FILTERING WITH FULLY DIFFERENTIAL

AMPLIFIERS

Similar to single-ended counterparts, fully differential

amplifiers

have

the

ability

couple

filtering

functionality

with

voltage

gain.

Numerous

filter

topologies

can

based

fully

differential

amplifiers. Several of these are outlined in the

application report A Differential Circuit Collection

(literature number SLOA064), referenced at the end

of this data sheet. The circuit below depicts a simple,

two-pole, low-pass filter applicable to many different

types of systems. The first pole is set by the resistors

and capacitors in the feedback paths, and the second

pole is set by the isolation resistors and the capacitor

across the outputs of the isolation resistors.

Figure 103. Using the THS4501 With the ADS5421

FULLY DIFFERENTIAL LINE DRIVERS

The THS4500 family of amplifiers can be used as

high-frequency, high-swing differential line drivers.

The

high

power-supply

voltage

rating

(16.5

absolute maximum) allows operation on a single 12-V

or a single 15-V supply. The high supply voltage,

coupled with the ability to provide differential outputs,

enables the ability to drive 26 VPP into reasonably

heavy loads (250

Ω or greater). The circuit in

Figure 105. A Two-Pole, Low-Pass Filter Design

Figure 104 illustrates the THS4500 family of devices

Using a Fully Differential Amplifier With Poles

used as high-speed line drivers. For line driver

Located at: P1 = (2

πRFCF)

–1 in Hz and

applications, close attention must be paid to thermal

P2 = (4

πRISOC)

–1 in Hz

design constraints because of the typically high level

of power dissipation.

Often, filters like these are used to eliminate

broadband noise and out-of-band distortion products

in signal acquisition systems. It should be noted that

the increased load placed on the output of the

amplifier

the

second

low-pass

filter

has

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