AD8566ARMZ-R2 datasheet(11/13 Pages) AD

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Data Sheet

AD8565/AD8566/AD8567

Rev. H | Page 11 of 13

TOTAL HARMONIC DISTORTION + NOISE (THD + N)

The AD8565/AD8566/AD8567 feature low total harmonic dis-

tortion. Figure 31 shows THD + N vs. frequency. The THD + N

over the entire supply range is below 0.008%. When the device

is powered from a 16 V supply, the THD + N stays below

0.003%. Figure 31 shows the AD8566 in a unity noninverting

configuration.

FREQUENCY (Hz)

100

0.01

0.1

10k

30k

VS = ±2.5V

VS = ±8V

Figure 31. THD + N vs. Frequency

SHORT-CIRCUIT OUTPUT CONDITIONS

The AD8565/AD8566/AD8567 do not have internal short-

circuit protection circuitry. As a precautionary measure, it is

recommended not to short the output directly to the positive

power supply or to ground.

It is not recommended to operate the AD8565/AD8566/AD8567

with more than 35 mA of continuous output current. The

output current can be limited by placing a series resistor at the

output of the amplifier whose value can be derived using

R 

For a 5 V single-supply operation, RX must have a minimum

value of 143 Ω.

LCD PANEL APPLICATIONS

The AD8565/AD8566/AD8567 amplifier is designed for LCD

panel applications or applications where large capacitive load

drive is required. It can instantaneously source/sink greater than

250 mA of current. At unity gain, it can drive 1 μF without

compensation. This makes the AD8565/AD8566/AD8567 ideal

for LCD VCOM driver applications.

To evaluate the performance of the AD8565/AD8566/AD8567,

a test circuit was developed to simulate the VCOM driver

application for an LCD panel. Figure 32 shows the test circuit.

Series capacitors and resistors connected to the output of the op

amp represent the load of the LCD panel. The 300 Ω and 3 kΩ

feedback resistors are used to improve settling time. This test

circuit simulates the worst-case scenario for a VCOM. It drives a

represented load that is connected to a signal switched symmet-

rically around VCOM.

Figure 33 shows a scope photo of the instantaneous output peak

current capability of the AD8565/AD8566/AD8567.

INPUT 0VTO 8V

SQUARE WAVE WITH

15.6µs PULSE WIDTH

300Ω

3kΩ

10Ω

10nF

MEASURE

CURRENT

10Ω TO 20Ω

Figure 32. VCOM Test Circuit with Supply Voltage at 16 V

TIME (2µs/DIV)

CH 2 = 100mA/DIV

CH 1 = 5V/DIV

100

Figure 33. Scope Photo of the VCOM Instantaneous Peak Current

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