THS4524MDBTREP datasheet(31/48 Pages) NSC

31 / 48 page

-95

101

103

105

107

109

111

113

115

100

1 k

10 k

100 k

Frequency (Hz)

TOTAL HARMONIC DISTORTION + NOISE

vs FREQUENCY (No Weighting)

-50

-60

-70

-80

-90

-100

-110

-120

Frequency (kHz)

TOTAL HARMONIC DISTORTION + NOISE

THS4524 Measured on AP Analyzer

THS4524

Signal Generator

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

-130

-140

5 k

10 k

15 k

20 k

25 k

30 k

35 k

Frequency (Hz)

Generator

THS4524

= 5.0 V

G = 1 V/V

R = 1 k

= 1 V

S+

OUT

RMS

10-kHz OUTPUT SPECTRUM

THS4524 on AP Analyzer

THS4524-EP

www.ti.com

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

Note that the harmonic distortion performance is very

close to the same with and without the device

meaning the THS4524 performance is actually much

better

than

can

directly

measured

this

meathod. The actual device performance can be

estimated by placing the device in a large noise gain

and using the reduction in loop gain correction. The

THS4524 is placed in a noise gain of 101 by adding a

10-

Ω resistor directly across the input terminals of the

circuit shown in Figure 69. This test was performed

using the AP instrument as both the signal source

and

the

analyzer.

The

second-order

harmonic

distortion at 1 kHz is estimated to be –122 dBc with

VO = 1VRMS; third-order harmonic distortion is

estimated to be –141 dBc. The third-order harmonic

distortion

result

matches

exactly

with

design

simulations, but the second-order harmonic distortion

is about 10 dB worse. This result is not unexpected

Figure 71. THS4524 1-VRMS 10-kHz FFT Plot

because

second-order

harmonic

distortion

performance with a differential signal depends heavily

The

THS4524

shows

even

better

THD+N

on cancellation as a result of the differential nature of

performance when driving higher amplitude output,

the signal, which depends on board layout, bypass

such as 5 VPP that is more typical when driving an

capacitors, external cabling, and so forth. Note that

ADC. To show performance with an extended

the circuit of Figure 69 is also used to measure

frequency range, higher gain, and higher amplitude,

crosstalk between channels.

the device was tested with 5 VPP up to 80 kHz with

the AP. Figure 72 shows the resulting THD+N graph

with no weighting.

Figure 70. THS4524 1-VRMS 20-Hz

to 20-kHz THD+N

Figure 72. THD+N (No Weighting) on AP, 80-kHz

Bandwidth at G = 1 with 5-VPP Output

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