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AD8672ARMZ Scheda tecnica(PDF) 13 Page - Analog Devices

Il numero della parte AD8672ARMZ
Spiegazioni elettronici  Precision, Very Low Noise, Low Input Bias Current Operational Amplifiers
PDF  20 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8672ARMZ Scheda tecnica(HTML) 13 Page - Analog Devices

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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
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
VS = ±5V
VIN = 2.5V
RL = 600Ω
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.
VSY = ±15V
RL = 2kΩ
CL = 1nF
VIN = 100mV
AV = +1
CH2 +OVER
39.80%
CH2 –OVER
39.80%
TIME (10
µs/DIV)
Figure 34. AD8671 Capacitive Load Drive
500
Ω
RF
VCC
220pF
CF
VIN
VEE
RG
500
Ω
10
Ω
RS
1nF
CL
2k
Ω
RL
Figure 35. Recommended Capacitive Load Circuit
VSY = ±15V
RL = 2kΩ
CL = 1nF
CF = 220pF
VIN = 100mV
AV = +2
CH2 +OVER
5.051%
CH2 –OVER
6.061%
TIME (10
µs/DIV)
Figure 36. Compensated Load Drive



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