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| 型号： | LT1228CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC CURRNT FEEDBK AMP 100MHZ8SOIC |
| 标准包装： | 100 |
| 放大器类型： | 电流反馈 |
| 电路数： | 1 |
| 转换速率： | 3500 V/µs |
| -3db带宽： | 100MHz |
| 电流 - 输入偏压： | 10µA |
| 电压 - 输入偏移： | 3000µV |
| 电流 - 电源： | 6mA |
| 电流 - 输出 / 通道： | 125mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 1318 (CN2011-ZH PDF) |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1228IN8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228IN8#PBF | 功能描述:IC CURRNT FEEDBK AMP 100MHZ 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1228IS8 | 制造商:LINER 制造商全称: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 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1228IS8#TRPBF | 功能描述:IC CRNT FEEDBK AMP 100MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
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