参数资料
| 型号： | LT1230CS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC CURR FEEDBACK AMP QUAD 14SOIC |
| 标准包装： | 55 |
| 放大器类型： | 电流反馈 |
| 电路数： | 4 |
| 转换速率： | 2500 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 ~ 30 V，±2 V ~ 15 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SO |
| 包装： | 管件 |
| 产品目录页面： | 1318 (CN2011-ZH PDF) |
11
LT1229/LT1230
Crosstalk and Cascaded Amplifiers
The amplifiers in the LT1229/LT1230 do not share any
common circuitry. The only thing the amplifiers share is
the supplies. As a result, the crosstalk between amplifiers
is very low. In a good breadboard or with a good PC board
layout the crosstalk from the output of one amplifier to the
input of another will be over 100dB down, up to 100kHz
and 65dB down at 10MHz. The following curve shows
the crosstalk from the output of one amplifier to the
input of another.
Amplifier Crosstalk vs Frequency
FREQUENCY (Hz)
10
50
OUTPUT
TO
INPUT
CROSSTALK
(dB)
60
70
80
90
100
120
100
1k
10k
100M
LT1229 TA12
100k
1M
10M
110
VS = ±15V
AV = 10
RS = 50
RL = 100
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
The high frequency crosstalk between amplifiers is
caused by magnetic coupling between the internal wire
bonds that connect the IC chip to the package lead frame.
The amount of crosstalk is inversely proportional to the
load resistor the amplifier is driving, with no load (just
the feedback resistor) the crosstalk improves 18dB. The
curve shows the crosstalk of the LT1229 amplifier B
output (Pin 7) to the input of amplifier A. The crosstalk
from amplifier A’s output (Pin 1) to amplifier B is about
10dB better. The crosstalk between all of the LT1230
amplifiers is as shown. The LT1230 amplifiers that are
separated by the supplies are a few dB better.
When cascading amplifiers the crosstalk will limit the
amount of high frequency gain that is available because
the crosstalk signal is out of phase with the input signal.
This will often show up as unusual frequency response.
For example: cascading the two amplifiers in the LT1229,
each set up with 20dB of gain and a –3dB bandwidth of
65MHz into 100
will result in 40dB of gain, BUT the
response will start to drop at about 10MHz and then flatten
out from 20MHz to 30MHz at about 0.5dB down. This is
due to the crosstalk back to the input of the first amplifier.
For best results when cascading amplifiers use the LT1229
and drive amplifier B and follow it with amplifier A.
U
S
A
O
PPLICATI
TYPICAL
Single 5V Supply Cable Driver for Composite Video
This circuit amplifies standard 1V peak composite video
input (1.4VP-P) by two and drives an AC coupled, doubly
terminated cable. In order for the output to swing
2.8VP-P on a single 5V supply, it must be biased accu-
rately. The average DC level of the composite input is a
function of the luminance signal. This will cause problems
if we AC couple the input signal into the amplifier because
a rapid change in luminance will drive the output into the
rails. To prevent this we must establish the DC level at the
input and operate the amplifier with DC gain.
The transistor’s base is biased by R1 and R2 at 2V. The
emitter of the transistor clamps the noninverting input of
the amplifier to 1.4V at the most negative part of the input
(the sync pulses). R4, R5 and R6 set the amplifier up with
a gain of two and bias the output so the bottom of the sync
pulses are at 1.1V. The maximum input then drives the
output to 3.9V.
LT1229 TA11
–
+
1/2
LT1229
VOUT
R3
150k
R2
2k
VIN
R5
750
C1
1
F
R8
10k
R1
3k
C2
1
F
R4
1.5k
2N3904
5V
C3
47
F
R6
510
R7
75
C4
1000
F
+
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