參數(shù)資料
型號(hào): AD8671ARMZ-REEL
廠商: Analog Devices Inc
文件頁數(shù): 5/20頁
文件大?。?/td> 0K
描述: IC OPAMP GP 10MHZ PREC LN 8MSOP
產(chǎn)品培訓(xùn)模塊: Top Five Problems in Photodiode Opamp Circuits
標(biāo)準(zhǔn)包裝: 1
放大器類型: 通用
電路數(shù): 1
轉(zhuǎn)換速率: 4 V/µs
增益帶寬積: 10MHz
電流 - 輸入偏壓: 3nA
電壓 - 輸入偏移: 20µV
電流 - 電源: 3mA
電流 - 輸出 / 通道: 20mA
電壓 - 電源,單路/雙路(±): 10 V ~ 36 V,±5 V ~ 18 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 772 (CN2011-ZH PDF)
其它名稱: AD8671ARMZ-REELDKR
Data Sheet
AD8671/AD8672/AD8674
Rev. F | Page 13 of 20
TOTAL HARMONIC DISTORTION (THD) AND NOISE
The AD8671/AD8672/AD8674 exhibit low total harmonic
distortion (THD) over the entire audio frequency range. This
makes them suitable for applications with high closed-loop
gains, including audio applications. Figure 33 shows
approximately 0.0006% of THD + N in a positive unity gain, the
worst-case configuration for distortion.
Hz
100
1k
10k
PERCENTAGE
LT1007
0.0001
0.0002
0.0005
0.0010
0.0020
0.0050
0.0100
0.0200
0.0500
0.1000
50
20
500
200
5k
2k
AD8671
20k
03718-B-035
VS = ±5V
VIN = 2.5V
RL = 600
Figure 33. Total Harmonic Distortion and Noise
DRIVING CAPACITIVE LOADS
The AD8671/AD8672/AD8674 can drive large capacitive loads
without causing instability. However, when configured in unity
gain, driving very large loads can cause unwanted ringing or
instability.
Figure 34 shows the output of the AD8671 with a capacitive
load of 1 nF. If heavier loads are used in low closed-loop gain or
unity-gain configurations, it is recommended to use external
compensation as shown in the circuit in Figure 35. This
technique reduces the overshoot and prevents the op amp from
oscillation. The trade-off of this circuit is a reduction in output
swing. However, a great added benefit stems from the fact that
the input signal and the op amp’s noise are filtered, and thus the
overall output noise is kept to a minimum.
The output response of the circuit is shown in Figure 36.
03718-B-036
VSY = ±15V
RL = 2k
CL = 1nF
VIN = 100mV
AV = +1
CH2 +OVER
39.80%
CH2 –OVER
39.80%
TIME (10
s/DIV)
V
O
L
T
AG
E
(
500mV
/DI
V
)
Figure 34. AD8671 Capacitive Load Drive
500
RF
VCC
220pF
CF
VIN
VEE
RG
500
10
RS
1nF
CL
03718-B-037
2k
RL
Figure 35. Recommended Capacitive Load Circuit
03718-B-038
VSY = ±15V
RL = 2k
CL = 1nF
CF = 220pF
VIN = 100mV
AV = +2
CH2 +OVER
5.051%
CH2 –OVER
6.061%
TIME (10
s/DIV)
V
O
L
T
AG
E
(
100mV
/DI
V
)
Figure 36. Compensated Load Drive
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