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AD8567ACP-REEL bảng dữ liệu(PDF) 11 Page - Analog Devices

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AD8567ACP-REEL bảng dữ liệu(HTML) 11 Page - Analog Devices

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AD8565/AD8566/AD8567
Rev. D | Page 11 of 16
TOTAL HARMONIC DISTORTION + NOISE (THD+N)
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.
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.
To evaluate the performance of the AD856x family, a test circuit
was developed to simulate the VCOM driver application for an
LCD panel.
FREQUENCY (Hz)
20
100
10
1
0.01
0.1
1k
10k
30k
VS = ±2.5V
VS = ±8V
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.
INPUT 0VTO 8V
SQUARE WAVE WITH
15.6µs PULSE WIDTH
300Ω
3kΩ
10Ω
10Ω
10Ω
10Ω
10nF
10nF
10nF
10nF
MEASURE
CURRENT
4V
8V
10Ω TO 20Ω
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.
Figure 32. VCOM Test Circuit with Supply Voltage at 16 V
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
TIME (2µs/DIV)
CH 2 = 100mA/DIV
CH 1 = 5V/DIV
10
0%
100
90
mA
35
S
X
V
R ≥
For a 5 V single-supply operation, RX should have a minimum
value of 143 Ω.
Figure 33. Scope Photo of the VCOM Instantaneous Peak Current


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