Datasheet 搜索 > 放大器、缓冲器 > Linear Technology（凌力尔特） > LT1228CS8 数据手册 > LT1228CS8 数据手册 1/22 页
器件3D模型￥ 32.127
LT1228CS8 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
放大器、缓冲器
封装:
SO
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
典型应用电路图在P1P14P15P16P17P18P22
原理图在P8
封装尺寸在P19
焊盘布局在P20
技术参数、封装参数在P4
应用领域在P1P4P9P10P11P12P13P14P15P16P17P18
电气规格在P3P4P5P6P7P8
导航目录
LT1228CS8数据手册
Page:
of 22 Go
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LT1228
1
1228fd
TYPICAL APPLICATION
FEATURES DESCRIPTION
100MHz Current Feedback
Amplifier with DC Gain Control
The LT
®
1228 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.
The LT1228 transconductance amplifier has a high imped-
ance differential input and a current source output with wide
output voltage
compliance. The transconductance, g
m
, is
set by the current that flows into Pin 5, I
SET
. The small signal
g
m
is equal to ten times the value of I
SET
and this relationship
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
impedance and therefore it is
an excellent buffer for the out-
put of the transconductance amplifier. The current feedback
amplifier maintains its wide bandwidth over a wide range of
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,
such as cables, with excellent linearity at high frequencies.
APPLICATIONS
n
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
g
m
= 10 × I
SET
Low THD: 0.2% at 30mV
RMS
Input
Wide I
SET
Range: 1µA to 1mA
n
Very Fast Current Feedback Amplifier
Bandwidth: 100MHz
Slew Rate: 1000V/µs
Output Drive Current: 30mA
Differential Gain: 0.04%
Differential Phase: 0.1°
High Input Impedance: 25MΩ, 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, LT C , LT M, 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
4.7µF
R4
1.24k
R6
6.19k
R5
10k
I
SET
R1
270Ω
R
G
10Ω
R
F
470Ω
4.7µF
15V
g
m
CFA
V
OUT
1
8
6
3
2
7
5
4
–15V
+
–
V
IN
HIGH INPUT RESISTANCE
EVEN WHEN POWER IS OFF
–18dB < GAIN < 2dB
V
IN
≤ 3V
RMS
FREQUENCY (Hz)
100k
–24
GAIN (dB)
–15
–3
3
6
1M 10M 100M
LT1228 • TA02
0
–6
–9
–12
–18
–21
I
SET
= 100µA
V
S
= ±15V
R
L
= 100Ω
I
SET
= 1mA
I
SET
= 300µA
Differential Input Variable Gain Amp
Frequency Response
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