參數(shù)資料
型號(hào)： AD8057
廠商： Analog Devices, Inc.
英文描述： Voltage Feedback, 325 MHz Amplifiers(低成本,高性能,電壓反饋放大器)
中文描述： 電壓反饋，325兆赫放大器（低成本，高性能，電壓反饋放大器）
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 198K
代理商： AD8057
AD8057/AD8058
–11–
REV. 0
FREQUENCY – Hz
100
10
0.110
100M
100
I
N
H
1k
10k
100k
1
1M
10M
Figure 37. Current Noise vs. Frequency
FREQUENCY – MHz
100
10
0.1
0.1
1000
1
Z
O
V
10
100
1
Figure 38. Output Impedance vs. Frequency
APPLICATIONS
Driving Capacitive Loads
When driving a capacitive load, most op amps will exhibit over-
shoot in their pulse response.
Figure 39 shows the relationship between the capacitive load that
results in 30% overshoot and closed loop gain of an AD8058. It can
be seen that, under the Gain = +2 condition, the device is stable
with capacitive loads of up to 69 pF.
In general, to minimize peaking or to ensure device stability for
larger values of capacitive loads, a small series resistor, R
S
, can
be added between the op amp output and the load capacitor, C
L
,
as shown in Figure 40.
For the setup shown in Figure 40, the relationship between R
S
and C
L
was empirically derived and is shown in Table I.
CLOSED-LOOP GAIN
500
400
0
1
5
2
C
L
3
4
300
200
100
R
S
= 2.4
V
R
S
= 0
V
Figure 39. Capacitive Load Drive vs. Closed-Loop Gain
Table I. Recommended Value for Resistors R
S
, R
F
, R
G
vs.
Capacitive Load, C
L
, Which Results in 30% Overshoot
Gain
1
2
3
4
5
10
R
F
100
100
100
100
100
100
R
G
C
L
w/R
S
= 0
C
L
w/R
S
= 2.4
V
11
13
51
69
104
153
186
270
245
500
870
1580
100
50
33.2
25
11
–2.5V
R
G
50k
V
V
IN
= 200mV p-p
AD8058
0.1
m
F
10
m
F
0.1
m
F
10
m
F
+2.5V
R
F
C
L
R
S
V
OUT
FET PROBE
Figure 40. Capacitive Load Drive Circuit
100mV
50ns/DIV
200mV
–100mV
–200mV
+ OVERSHOOT
29.0%
100mV
Figure 41. Typical Pulse Response with C
L
= 65 pF,
Gain = +2, and V
S
=
±
2.5 V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD8057_03 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers
AD8057ACHIPS 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers
AD8057AR 功能描述:IC OPAMP VF LN LP LDIST 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR)
AD8057AR-EBZ 功能描述:BOARD EVAL FOR AD8057AR RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
AD8057AR-REEL 功能描述:IC OPAMP VF LN LP LDIST 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°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:帶卷 (TR)
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