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參數(shù)資料
| 型號： | AD823 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual, 16 MHz, Rail-to-Rail FET Input Amplifier(16MHz,滿幅度,場效應(yīng)晶體管輸入雙運放) |
| 中文描述： | 雙路，16兆赫，軌到軌FET輸入放大器（16MHz的，滿幅度，場效應(yīng)晶體管輸入雙運放） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 372K |
| 代理商： | AD823 |
REV. 0
–14–
AD823
MYLAR
1μF
A1/2
L
R
HEADPHONES
32
IMPEDANCE
4.99k
MYLAR
1μF
4.99k
10k
10k
47.5k
95.3k
47.5k
500μF
500μF
+3V
95.3k
0.1μF
0.1μF
CHANNEL 1
CHANNEL 2
95.3k
+
+
7
4
5
6
A1/2
3
8
2
1
Figure 40. 3 Volt Single Supply Stereo Headphone Driver
Second Order Low-Pass Filter
Figure 41 depicts the AD823 configured as a second order
Butterworth low-pass filter. With the values as shown, the cor-
ner frequency will be 200 kHz. The equations for component
selection are shown below:
R1 = R2 = user selected (typical values: 10 k
to 100 k
).
C
1(
farads
)
=
1.414
2
π
f
cutoff
R
1;
C
2
=
0.707
2
π
f
cutoff
R
1
1/2
AD823
C3
0.1μF
+5V
C4
0.1μF
V
OUT
V
IN
C1
28pF
–5V
C2
56pF
R1
20k
R2
20k
50pF
Figure 41. Second Order Low-Pass Filter
A plot of the filter is shown below; better than 50 dB of high fre-
quency rejection is provided.
Figure 39 is an FFT plot of the results of driving the AD1672
with the AD823 with no pull-down resistor. The input ampli-
tude was 2.15 V p-p and the lower voltage excursion was
350 mV. The input frequency was 490 kHz, which was chosen
to spread the location of the harmonics.
The distortion analysis is important for systems requiring good
frequency domain performance. Other systems may require
good time domain performance. The noise and settling time
performance of the AD823 will provide the necessary informa-
tion for its applicability for these systems.
5
6
4
9
7
2
3
8
1
V
= 2.15Vp-p
G = +1
F
I
= 490kHz
1
Figure 39. FFT of AD1672 Output Driven by AD823
3 Volt, Single Supply Stereo Headphone Driver
The AD823 exhibits good current drive and THD+N perfor-
mance, even at 3 V single supplies. At 20 kHz, total harmonic
distortion plus noise (THD+N) equals –62 dB (0.079%) for a
300 mV p-p output signal. This is comparable to other single
supply op amps which consume more power and cannot run on
3 V power supplies.
In Figure 40, each channel’s input signal is coupled via a 1
μ
F
Mylar capacitor. Resistor dividers set the dc voltage at the non-
inverting inputs so that the output voltage is midway between
the power supplies (+1.5 V). The gain is 1.5. Each half of the
AD823 can then be used to drive a headphone channel. A 5 Hz
high-pass filter is realized by the 500
μ
F capacitors and the
headphones, which can be modeled as 32 ohm load resistors to
ground. This ensures that all signals in the audio frequency
range (20 Hz–20 kHz) are delivered to the headphones.
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