參數(shù)資料
型號(hào): AD8515ART-REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 5/16頁(yè)
文件大?。?/td> 0K
描述: IC AMP GP R-R CMOS 5MHZ SOT23-5
設(shè)計(jì)資源: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
標(biāo)準(zhǔn)包裝: 10,000
放大器類型: 通用
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 2.7 V/µs
增益帶寬積: 5MHz
電流 - 輸入偏壓: 5pA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 410µA
電流 - 輸出 / 通道: 20mA
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SC-74A,SOT-753
供應(yīng)商設(shè)備封裝: SOT-23-5
包裝: 帶卷 (TR)
AD8515
Rev. D | Page 13 of 16
DRIVING CAPACITIVE LOADS
Most amplifiers have difficulty driving large capacitive loads.
Additionally, higher capacitance at the output can increase the
amount of overshoot and ringing in the amplifier’s step response
and can even affect the stability of the device. This is due to the
degradation of phase margin caused by additional phase lag from
the capacitive load. The value of capacitive load that an amplifier
can drive before oscillation varies with gain, supply voltage, input
signal, temperature, and other parameters. Unity gain is the most
challenging configuration for driving capacitive loads. The AD8515
is capable of driving large capacitive loads without any external
compensation. The graphs in Figure 31 and Figure 32 show the
amplifier’s capacitive load driving capability when configured
in unity gain of +1.
The AD8515 is even capable of driving higher capacitive loads
in inverting gain of 1, as shown in Figure 33.
03
02
4-
03
1
V
O
L
T
A
G
E
(
10
0m
V/
D
IV)
TIME (1s/DIV)
VS = ±2.5V
CL = 50pF
GAIN = 1
Figure 31. Capacitive Load Driving @ CL = 50 pF
03
02
4-
03
2
VO
L
T
A
G
E
(
10
m
V/
D
IV
)
TIME (1s/DIV)
VS = ±2.5V
CL = 500pF
GAIN = 1
Figure 32. Capacitive Load Driving @ CL = 500 pF
03
02
4-
03
3
V
O
L
T
A
G
E
(
10
0m
V/
D
IV)
TIME (1s/DIV)
VS = ±0.9V
CL = 800pF
GAIN = –1
Figure 33. Capacitive Load Driving @ CL = 800 pF
FULL POWER BANDWIDTH
The slew rate of an amplifier determines the maximum frequency
at which it can respond to a large input signal. This frequency
(known as full power bandwidth, FPBW) can be calculated from
the equation
PEAK
V
SR
FPBW
×
π
=
2
for a given distortion. The FPBW of the AD8515 is shown in
Figure 34 to be close to 200 kHz.
03
02
4-
03
4
VO
L
T
A
G
E
(2V/
D
IV
)
TIME (2s/DIV)
VIN
VOUT
Figure 34. Full Power Bandwidth
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