THS4524MDBTREP datasheet(30/48 Pages) NSC

30 / 48 page

THS452x

24.9 W

1kW

24.9 W

OCM

Open

From

Analyzer

OUT+

IN+

ToAP

Analyzer

S+

IN-

S-

0.22 F

OUT-

100

1000

(pF)

LOAD

RECOMMENDED R vs C

For Flat Frequency Response

LOAD

= 5.0 V

Gain = 1 V/V

S+

R = 1 k

Differential

= 100 mV

OUT

0.1

100

1000

Frequency (MHz)

FREQUENCY RESPONSE vs C

LOAD

R = 124

C = 10 pF

each output

R = 37.5

C = 100 pF each output

R = 7.15

C = 1000 pF each output

R = 150

C = 4.7 pF

each output

= 5.0 V, Gain = 1 V/V

S+

R = 1 k

differential

R = 1 k

= 100 mV

OUT

THS4524-EP

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

www.ti.com

Driving Capacitive Loads

The THS4524 is designed for a nominal capacitive

load of 1 pF on each output to ground. When driving

capacitive loads greater than 1 pF, it is recommended

to use small resistors (RO) in series with the output,

placed as close to the device as possible. Without

RO, capacitance on the output interacts with the

output impedance of the amplifier and causes phase

shift in the loop gain of the amplifier that reduces the

phase margin. This reduction in phase margin results

frequency

response

peaking;

overshoot,

undershoot, and/or ringing when a step or square-

wave signal is applied; and may lead to instability or

oscillation. Inserting RO isolates the phase shift from

the loop gain path and restores the phase margin, but

it also limits bandwidth. Figure 67 shows the

recommended values of RO versus capacitive loads

Figure 68. Frequency Response for Various RO

(CL), and Figure 68 shows an illustration of the

and CL Values, with RLOAD = 1 kΩ

frequency response with various values.

Audio Performance

The THS4524 provides excellent audio performance

with very low quiescent power. To show performance

in the audio band, the device was tested with a SYS-

2722 audio analyzer from Audio Precision. THD+N

and FFT tests were performed at 1-VRMS output

voltage. Performance is the same on both 3.3-V and

5-V supplies. Figure 69 shows the test circuit used;

see Figure 70 and Figure 71 for the performance of

the

analyzer

using

internal

loopback

mode

(generator) together with the THS4524.

Figure 67. Recommended Series Output Resistor

versus Capacitive Load for Flat Frequency

Response, with RLOAD = 1 kΩ

Figure 69. THS4524 AP Analyzer Test Circuit

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THS4524MDBTREP Datasheet(PDF) 30 Page - National Semiconductor (TI)

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