AD8567ARU-REEL 查看數據表（PDF） - Analog Devices

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AD8567ARU-REEL

16 V Rail-to-Rail Operational Amplifiers

Analog Devices 

TOTAL HARMONIC DISTORTION + NOISE (THD+N)

The AD856x family features low total harmonic distortion.

Figure 31 shows THD+N vs. frequency. The THD+N for the

AD856x 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.

10

1

0.1

VS = ±2.5V

VS = ±8V

0.01

20

100

1k

FREQUENCY (Hz)

10k

30k

Figure 31. THD+N vs. Frequency

SHORT-CIRCUIT OUTPUT CONDITIONS

The AD856x family does 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 AD856x 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

RX

≥

VS

35 mA

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

value of 143 Ω.

AD8565/AD8566/AD8567

LCD PANEL APPLICATIONS

The AD856x 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 AD856x ideal for LCD VCOM driver applications.

To evaluate the performance of the AD856x family, 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 symmetrically around VCOM. Figure 33 shows a

scope photo of the instantaneous output peak current capability

of the AD856x family.

300Ω

8V

3kΩ

INPUT 0V TO 8V

SQUARE WAVE WITH

15.6µs PULSE WIDTH

10Ω 10Ω 10Ω 10Ω

4V

MEASURE

CURRENT

10nF 10nF

10nF

10nF

10Ω TO 20Ω

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

100

90

CH 2 = 100mA/DIV

CH 1 = 5V/DIV

10

0%

TIME (2µs/DIV)

Figure 33. Scope Photo of the VCOM Instantaneous Peak Current

Rev. D | Page 11 of 16

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