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參數(shù)資料
| 型號(hào)： | AD829AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | High-Speed, Low-Noise Video Op Amp |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 336K |
| 代理商： | AD829AR |
AD829
REV. C
–9–
T able I. Component Selection for Shunt Compensation
Slew
Rate
V/
m
s
–3 dB
Small Signal
Bandwidth – MHz
Follower
Gain
Inverter
Gain
R1
V
R2
V
C
L
pF
C
COMP
pF
1
2
5
10
20
25
100
Open
1k
511
226
105
105
20
100
1k
2.k
2.5k
2k
2.49
2k
0
5
1
0
0
0
0
68
25
7
3
0
0
0
16
38
90
130
230
230
230
66
71
76
65
55
39
7.5
–1
–4
–9
–19
–24
–99
T able I gives recommended C
COMP
and C
LEAD
values along with
the corresponding slew rates and bandwidth. T he capacitor val-
ues given were selected to provide a small signal frequency re-
sponse with less than 1 dB of peaking and less than 10%
overshoot. For this table, supply voltages of
±
15 volts should be
used. Figure 28 is a graphical extension of the table which
shows the slew rate/gain trade-off for lower closed-loop gains,
when using the shunt compensation scheme.
Figure 28. Value of C
COMP
& Slew Rate vs. Noise Gain
Current Feedback Compensation
Bipolar nondegenerated amplifiers which are single pole and in-
ternally compensated have their bandwidths defined as:
f
T
=
1
2
π
r
e
C
COMP
=
I
2
π
kT
qC
COMP
where:
f
T
is the unity gain bandwidth of the amplifier
I is the collector current of the input transistor
C
COMP
is the compensation capacitance
r
e
is the inverse of the transconductance of the input transistors
kT /q is approximately equal to 26 mV @ 27
°
C.
Since both f
T
and slew rate are functions of the same variables,
the dynamic behavior of an amplifier is limited. Since:
Slew Rate
=
2
I
C
COMP
then:
Slew Rate
f
T
=
4
π
kT
q
T his shows that the slew rate will be only 0.314 V/
μ
s for every
MHz of bandwidth. T he only way to increase slew rate is to in-
crease the f
T
and that is difficult, due to process limitations. Un-
fortunately, an amplifier with a bandwidth of 10 MHz can only
slew at 3.1 V/
μ
s, which is barely enough to provide a full power
bandwidth of 50 kHz.
T he AD829 is especially suited to a new form of compensation
which allows for the enhancement of both the full power band-
width and slew rate of the amplifier. T he voltage gain from the
inverting input pin to the compensation pin is large; therefore, if
a capacitance is inserted between these pins, the amplifier’s
bandwidth becomes a function of its feedback resistor and this
capacitance. T he slew rate of the amplifier is now a function of
its internal bias (2I) and this compensation capacitance.
Since the closed-loop bandwidth is a function of R
F
and C
COMP
(Figure 29), it is independent of the amplifier closed-loop gain,
as shown in Figure 31. T o preserve stability, the time constant
of R
F
and C
COMP
needs to provide a bandwidth of less than
65 MHz. For example, with C
COMP
= 15 pF and R
F
= 1 k
, the
small signal bandwidth of the AD829 is 10 MHz, while Figure
30 shows that the slew rate is in excess of 60 V/
μ
s. As can be
seen in Figure 31, the closed-loop bandwidth is constant for
gains of –1 to –4, a property of current feedback amplifiers.
Figure 29. Inverting Amplifier Connection Using Current
Feedback Compensation
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| AD829AR-EBZ | 功能描述:BOARD EVAL FOR AD829AR RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| AD829AR-REEL | 功能描述:IC VIDEO OPAMP HS LN 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| AD829AR-REEL7 | 功能描述:IC VIDEO OPAMP HS LN 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| AD829ARZ | 功能描述:IC VIDEO OPAMP HS LN 8-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:TFT-LCD 面板：VCOM 驅(qū)動(dòng)器 輸出類型:滿擺幅 電路數(shù):1 -3db帶寬:35MHz 轉(zhuǎn)換速率:40 V/µs 電流 - 電源:3.7mA 電流 - 輸出 / 通道:1.3A 電壓 - 電源，單路/雙路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:8-uMax-EP 包裝:管件 |
| AD829ARZ-REEL | 功能描述:IC VIDEO OPAMP HS LN 8-SOIC T/R RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
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