參數(shù)資料
型號: AD8620ARZ
廠商: Analog Devices Inc
文件頁數(shù): 6/24頁
文件大小: 0K
描述: IC OPAMP JFET 25MHZ DUAL 8SOIC
設(shè)計資源: Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047)
標(biāo)準(zhǔn)包裝: 1
放大器類型: J-FET
電路數(shù): 2
轉(zhuǎn)換速率: 60 V/µs
增益帶寬積: 25MHz
電流 - 輸入偏壓: 3pA
電壓 - 輸入偏移: 85µV
電流 - 電源: 3mA
電流 - 輸出 / 通道: 45mA
電壓 - 電源,單路/雙路(±): ±5 V ~ 13 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 管件
產(chǎn)品目錄頁面: 773 (CN2011-ZH PDF)
AD8610/AD8620
Rev. F | Page 14 of 24
Driving Large Capacitive Loads
The AD8610/AD8620 have excellent capacitive load driving
capability and can safely drive up to 10 nF when operating with
a ±5.0 V supply. Figure 44 and Figure 45 compare the AD8610/
AD8620 against the OPA627 in the noninverting gain configu-
ration driving a 10 kΩ resistor and 10,000 pF capacitor placed
in parallel on its output, with a square wave input set to a frequency
of 200 kHz. The AD8610/AD8620 have much less ringing than
the OPA627 with heavy capacitive loads.
02
73
0-
04
4
V
O
L
T
A
G
E
(
20
m
V/
D
IV)
TIME (2s/DIV)
VS = ±5V
RL = 10k
CL = 10,000pF
Figure 44. OPA627 Driving CL = 10,000 pF
02
73
0-
0
45
V
O
L
T
A
G
E
(2
0m
V/
D
IV)
TIME (2s/DIV)
VS = ±5V
RL = 10k
CL = 10,000pF
Figure 45. AD8610/AD8620 Driving CL = 10,000 pF
The AD8610/AD8620 can drive much larger capacitances
without any external compensation. Although the AD8610/
AD8620 are stable with very large capacitive loads, remember
that this capacitive loading limits the bandwidth of the amplifier.
Heavy capacitive loads also increase the amount of overshoot
and ringing at the output. Figure 47 and Figure 48 show the
AD8610/AD8620 and the OPA627 in a noninverting gain of +2
driving 2 μF of capacitance load. The ringing on the OPA627 is
much larger in magnitude and continues 10 times longer than
the AD8610/AD8620.
VIN = 50mV
2k
–5V
+5V
2F
3
2
7
4
02
73
0-
04
6
Figure 46. Capacitive Load Drive Test Circuit
02
73
0-
0
47
V
O
L
T
A
G
E
(
50
m
V/
D
IV)
TIME (20s/DIV)
VS = ±5V
RL = 10k
CL = 2F
Figure 47. OPA627 Capacitive Load Drive, AV = +2
02
73
0-
0
48
V
O
L
T
A
G
E
(5
0m
V/
D
IV)
TIME (20s/DIV)
VS = ±5V
RL = 10k
CL = 2F
Figure 48. AD8610/AD8620 Capacitive Load Drive, AV = +2
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