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參數(shù)資料
| 型號： | LT1228 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 100MHz Current Feedback Amplifier with DC Gain Control(100MHz ，電流反饋放大器（帶直流增益控制）) |
| 中文描述： | 100MHz的電流反饋放大器的直流增益控制（100MHz時，電流反饋放大器（帶直流增益控制）） |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 357K |
| 代理商： | LT1228 |
1
LT1228
100MHz Current Feedback
Amplifier with DC Gain Control
D
U
ESCRIPTIO
U
S
A
I
Video DC Restore (Clamp) Circuits
I
Video Differential Input Amplifiers
I
Video Keyer/Fader Amplifiers
I
AGC Amplifiers
I
Tunable Filters
I
Oscillators
O
PPLICATI
I
Very Fast Transconductance Amplifier
Bandwidth: 75MHz
g
m
= 10
×
I
SET
Low THD: 0.2% at 30mV
RMS
Input
Wide I
SET
Range: 1
μ
A to 1mA
I
Very Fast Current Feedback Amplifier
Bandwidth: 100MHz
Slew Rate: 1000V/
μ
s
Output Drive Current: 30mA
Differential Gain: 0.04%
Differential Phase: 0.1
°
High Input Impedance: 25M
, 6pF
I
Wide Supply Range:
±
2V to
±
15V
I
Inputs Common Mode to Within 1.5V of Supplies
I
Outputs Swing Within 0.8V of Supplies
I
Supply Current: 7mA
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 amplifier
(voltage to current) whose gain is proportional to an exter-
nally 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
output of the transconductance amplifier. The current feed-
back amplifier maintains its wide bandwidth over a wide
range of voltage gains making it easy to interface the
transconductance amplifier output to other circuitry. The
current feedback amplifier is designed to drive low imped-
ance loads, such as cables, with excellent linearity at high
frequencies.
S
FEATURE
Frequency Response
U
A
O
PPLICATI
Differential Input Variable Gain Amp
TYPICAL
FREQUENCY (Hz)
100k
–24
G
–15
–3
3
6
1M
10M
100M
LT1228 TA02
0
–6
–9
–12
–18
–21
I
SET
= 100
μ
A
V
S
= ±15V
R
L
= 100
I
SET
= 1mA
I
SET
= 300
μ
A
LT1228 TA01
–
+
–
+
+
+
R3A
10k
R2A
10k
R3
100
R2
100
4.7
μ
F
R4
1.24k
R6
6.19
R5
10k
I
SET
R1
270
R
G
10
R
F
470
4.7
μ
F
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
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相關代理商/技術參數(shù) |
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| LT1228_07 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback |
| LT1228C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228CJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228CN8 | 功能描述:IC CURRNT FEEDBCK AMP100MHZ 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應商設備封裝:16-DFN-EP（5x3） 包裝:管件 |
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