參數(shù)資料
型號： LT1028CSW#TR
廠商： Linear Technology
文件頁數(shù)： 7/28頁
文件大?。?/td> 0K
描述： IC OP AMP LOW NOISE HS 16SOIC
標準包裝： 1,000
放大器類型： 通用
電路數(shù)： 1
轉(zhuǎn)換速率： 15 V/µs
增益帶寬積： 75MHz
電流 - 輸入偏壓： 30nA
電壓 - 輸入偏移： 20µV
電流 - 電源： 7.6mA
電壓 - 電源，單路/雙路(±)： ±4 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SO
包裝： 帶卷 (TR)
LT1028/LT1128
15
1028fb
applicaTions inForMaTion
Frequency Response
The LT1028’s Gain, Phase vs Frequency plot indicates that
the device is stable in closed-loop gains greater than +2 or
–1becausephasemarginisabout50°atanopen-loopgain
of 6dB. In the voltage follower configuration phase margin
seems inadequate. This is indeed true when the output is
shorted to the inverting input and the noninverting input
is driven from a 50Ω source impedance. However, when
feedback is through a parallel R-C network (provided CF
< 68pF), the LT1028 will be stable because of interaction
between the input resistance and capacitance and the
feedback network. Larger source resistance at the non-
inverting input has a similar effect. The following voltage
follower configurations are stable:
Another configuration which requires unity-gain stability
is shown below. When CF is large enough to effectively
short the output to the input at 15MHz, oscillations can
occur.TheinsertionofRS2≥500ΩwillpreventtheLT1028
from oscillating. When RS1 ≥ 500Ω, the additional noise
contribution due to the presence of RS2 will be minimal.
When RS1 ≤ 100Ω, RS2 is not necessary, because RS1
represents a heavy load on the output through the CF
short. When 100Ω < RS1 < 500Ω, RS2 should match RS1.
For example, RS1 = RS2 = 300Ω will be stable. The noise
increase due to RS2 is 40%.
If CF is only used to cut noise bandwidth, a similar effect
can be achieved using the over-compensation terminal.
The Gain, Phase plot also shows that phase margin is
about45°atgainof10(20dB).Thefollowingconfiguration
has a high (≈70%) overshoot without the 10pF capacitor
because of additional phase shift caused by the feedback
resistor–inputcapacitancepole.Thepresenceofthe10pF
capacitor cancels this pole and reduces overshoot to 5%.
1028 F09
–
+
33pF
2k
LT1028
50
–
+
LT1028
50
500
1028 F10
C1
R1
RS1
RS2
LT1028
–
+
1028 F11
10pF
10k
50
1.1k
–
+
LT1028
Figure 9
Over-Compensation
The LT1028/LT1128 are equipped with a frequency over-
compensation terminal (Pin 5). A capacitor connected
between Pin 5 and the output will reduce noise bandwidth.
DetailsareshownontheSlewRate,Gain-BandwidthProd-
uct vs Over-Compensation Capacitor plot. An additional
benefit is increased capacitive load handling capability.
Figure 10
Figure 11
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