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參數(shù)資料
| 型號(hào)： | LT1124M |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Buffers/Drivers With 3-State Outputs 20-SOIC 0 to 70 |
| 中文描述： | 雙/四低噪聲，高速精密運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 227K |
| 代理商： | LT1124M |
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9
LT1124/LT1125
High Speed Operation
When the feedback around the op amp is resistive (R
F
),
a pole will be created with R
F
, the source resistance and
capacitance (R
S
, C
S
), and the amplifier input capacitance
(C
IN
≈
2pF). In low closed loop gain configurations and
with R
S
and R
F
in the kilohm range, this pole can create
excess phase shift and even oscillation. A small capacitor
(C
F
) in parallel with R
F
eliminates this problem (see
Figure 2). With R
S
(C
S
+ C
IN
) = R
F
C
F
, the effect of the
feedback pole is completely removed.
During the fast feedthrough-like portion of the output, the
input protection diodes effectively short the output to the
input and a current, limited only by the output short circuit
protection, will be drawn by the signal generator. With R
F
≥
500
, the output is capable of handling the current
requirements (I
L
≤
20mA at 10V) and the amplifier stays
in its active mode and a smooth transition will occur.
Noise Testing
Each individual amplifier is tested to 4.2nV/
√
Hz voltage
noise; i.e., for the LT1124 two tests, for the LT1125 four
tests are performed. Noise testing for competing multiple
op amps, if done at all, may be sample tested or tested
using the circuit shown in Figure 4.
e
n OUT
=
√
(e
nA
)
2
+ (e
nB
)
2
+ (e
nC
)
2
+ (e
nD
)
2
If the LT1125 were tested this way, the noise limit would
be
√
4 (4.2nV/
√
Hz)
2
= 8.4nV/
√
Hz. But is this an effective
screen What if three of the four amplifiers are at a typical
2.7nV/
√
Hz, and the fourth one was contaminated and has
6.9nV/
√
Hz noise
RMS Sum =
√
(2.7)
2
+ (2.7)
2
+ (2.7)
2
+ (6.9)
2
= 8.33nV/
√
Hz
This passes an 8.4nV/
√
Hz spec, yet one of the amplifiers
is 64% over the LT1125 spec limit. Clearly, for proper
noise measurement, the op amps have to be tested
individually.
U
S
A
O
PPLICATI
U
U
+
–
1124/25 F03
OUTPUT
4.5V/
μ
s
R
F
Figure 3. Unity-Gain Buffer Applications
1124/25 F04
+
–
A
+
–
B
+
–
C
+
–
D
OUT
Figure 4. Competing Quad Op Amp Noise Test Method
–
+
OUTPUT
1124/25 F02
R
S
C
S
R
F
C
F
C
IN
Figure 2. High Speed Operation
Unity Gain Buffer Applications
When R
F
≤
100
and the input is driven with a fast, large
signal pulse (>1V), the output waveform will look as
shown in Figure 3.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1125AM | Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125AMJ | Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125C | Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125CJ | Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125CN | Octal Buffers/Drivers With 3-State Outputs 20-PDIP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1124MJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1124MJ8/883 | 制造商:Linear Technology 功能描述:OP Amp Dual GP ±22V 8-Pin CDIP 制造商:Linear Technology 功能描述:OP Amp Dual GP 22V 8-Pin CDIP |
| LT1125 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125AC | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, High Speed Precision Op Amps |
| LT1125ACN | 功能描述:IC OP-AMP LOW NOISE QUAD 14-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
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