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參數(shù)資料
| 型號： | LT1228IN8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 1/22頁 |
| 文件大小： | 0K |
| 描述： | IC CURRNT FEEDBK AMP 100MHZ 8DIP |
| 標準包裝： | 50 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3500 V/µs |
| -3db帶寬： | 100MHz |
| 電流 - 輸入偏壓： | 10µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 6mA |
| 電流 - 輸出 / 通道： | 125mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 8-PDIP |
| 包裝： | 管件 |
LT1228
1
1228fd
TYPICAL APPLICATION
FEATURES
DESCRIPTION
100MHz Current Feedback
Amplifier with DC Gain Control
The LT1228 makes it easy to electronically control the
gain of signals from DC to video frequencies. The LT1228
implements gain control with a transconductance ampli-
fier (voltage to current) whose gain is proportional to an
externally controlled current. A resistor is typically used
to convert the output current to a voltage, which is then
amplified with a current feedback amplifier. The LT1228
combines both amplifiers into an 8-pin package, and oper-
ates on any supply voltage from 4V (±2V) to 30V (±15V).
A complete differential input, gain controlled amplifier can
be implemented with the LT1228 and just a few resistors.
TheLT1228transconductanceamplifierhasahighimped-
ancedifferentialinputandacurrentsourceoutputwithwide
output voltage compliance. The transconductance, gm, is
setbythecurrentthatflowsintoPin5,ISET.Thesmallsignal
gmisequaltotentimesthevalueofISETandthisrelationship
holds over several decades of set current. The voltage at
Pin 5 is two diode drops above the negative supply, Pin 4.
The LT1228 current feedback amplifier has very high input
impedanceandthereforeitisanexcellentbufferfortheout-
putofthetransconductanceamplifier.Thecurrentfeedback
amplifiermaintainsitswidebandwidthoverawiderangeof
voltage gains making it easy to interface the transconduc-
tance amplifier output to other circuitry. The current feed-
back amplifier is designed to drive low impedance loads,
suchascables,withexcellentlinearityathighfrequencies.
APPLICATIONS
n
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
gm = 10 × ISET
Low THD: 0.2% at 30mVRMS Input
Wide ISET Range: 1A to 1mA
n
Very Fast Current Feedback Amplifier
Bandwidth: 100MHz
Slew Rate: 1000V/s
Output Drive Current: 30mA
Differential Gain: 0.04%
Differential Phase: 0.1°
High Input Impedance: 25M, 6pF
n
Wide Supply Range: ±2V to ±15V
n
Inputs Common Mode to Within 1.5V of Supplies
n
Outputs Swing Within 0.8V of Supplies
n
Supply Current: 7mA
n
Available in 8-Lead PDIP and SO Packages
n
Video DC Restore (Clamp) Circuits
n
Video Differential Input Amplifiers
n
Video Keyer/Fader Amplifiers
n
AGC Amplifiers
n
Tunable Filters
n
Oscillators
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT1228 TA01
–
+
–
+
R3A
10k
R2A
10k
R3
100Ω
R2
100Ω
4.7F
R4
1.24k
R6
6.19k
R5
10k
ISET
R1
270Ω
RG
10Ω
RF
470Ω
4.7F
15V
gm
CFA
VOUT
1
8
6
3
2
7
5
4
–15V
+
–
VIN
HIGH INPUT RESISTANCE
EVEN WHEN POWER IS OFF
–18dB < GAIN < 2dB
VIN ≤ 3VRMS
FREQUENCY (Hz)
100k
–24
GAIN
(dB)
–15
–3
3
6
1M
10M
100M
LT1228 TA02
0
–6
–9
–12
–18
–21
ISET = 100A
VS = ±15V
RL = 100
ISET = 1mA
ISET = 300A
Differential Input Variable Gain Amp
Frequency Response
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| LT1228IS8#PBF | IC CRNT FEEDBK AMP 100MHZ 8SOIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1228IS8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228IS8#PBF | 功能描述:IC CRNT FEEDBK AMP 100MHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| LT1228IS8#TRPBF | 功能描述:IC CRNT FEEDBK AMP 100MHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| LT1228M | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228MJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
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