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參數資料
| 型號： | AD823AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual, 16 MHz, Rail-to-Rail FET Input Amplifier |
| 中文描述： | DUAL OP-AMP, 3500 uV OFFSET-MAX, PDIP8 |
| 封裝： | PLASTIC, MO-095AA, DIP-8 |
| 文件頁數： | 14/16頁 |
| 文件大小： | 439K |
| 代理商： | AD823AN |
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.
相關PDF資料 |
PDF描述 |
|---|---|
| AD823AR | Dual, 16 MHz, Rail-to-Rail FET Input Amplifier |
| AD823AR-REEL | RECTIFIER SCHOTTKY SINGLE 8A 30V 200A-ifsm 0.55V-vf 0.5mA-ir TO220AC 50/TUBE |
| AD824AN-3V | VARISTOR 30VRMS 1206 SMD |
| AD824 | Single Supply, Rail-to-Rail Low Power, FET-Input Op Amp |
| AD824AN | Single Supply, Rail-to-Rail Low Power, FET-Input Op Amp |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD823AN | 制造商:Analog Devices 功能描述:GENERAL USAGE DUAL OP-AMP(2030031)((NS)) |
| AD823ANZ | 功能描述:IC OPAMP JFET R-R DUAL LN 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD823ANZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Analog Devices 功能描述:IC, OP-AMP, 16MHZ, 25V/s, 0.8mV, DIP-8 |
| AD823AR | 功能描述:IC OPAMP JFET R-R DUAL LN 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:150 系列:- 放大器類型:音頻 電路數:2 輸出類型:- 轉換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
| AD823AR | 制造商:Analog Devices 功能描述:SEMICONDUCTORS LINEAR |
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