参数资料
型号: LT6234IDD#PBF
厂商: Linear Technology
文件页数: 10/24页
文件大小: 0K
描述: IC OP AMP DUAL 60MHZ R-R 8-DFN
标准包装: 121
放大器类型: 通用
电路数: 2
输出类型: 满摆幅
转换速率: 17 V/µs
增益带宽积: 60MHz
电流 - 输入偏压: 1.5µA
电压 - 输入偏移: 75µV
电流 - 电源: 1.15mA
电流 - 输出 / 通道: 55mA
电压 - 电源,单路/双路(±): 3 V ~ 12.6 V,±1.5 V ~ 6.3 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
供应商设备封装: 8-DFN-EP(3x3)
包装: 管件
LT6233/LT6233-10
LT6234/LT6235
18
623345fc
applicaTions inForMaTion
With the amplifier connected in a gain of AV ≥ 2, the output
can invert with very heavy overdrive. To avoid this inver-
sion, limit the input overdrive to 0.5V beyond the power
supply rails.
ESD
The LT6233/LT6234/LT6235 have reverse-biased ESD
protection diodes on all inputs and outputs as shown in
Figure 1. If these pins are forced beyond either supply,
unlimited current will flow through these diodes. If the
current is transient and limited to one hundred milliamps
or less, no damage to the device will occur.
Noise
The noise voltage of the LT6233/LT6234/LT6235 is
equivalent to that of a 225Ω resistor, and for the lowest
possible noise it is desirable to keep the source and feed-
back resistance at or below this value, i.e., RS + RG||RFB
≤ 225Ω. With RS + RG||RFB = 225Ω the total noise of the
amplifier is:
eN = √(1.9nV)2 + (1.9nV)2 = 2.69nV/√Hz
Below this resistance value, the amplifier dominates the
noise, but in the region between 225Ω and about 30k,
the noise is dominated by the resistor thermal noise. As
the total resistance is further increased beyond 30k, the
amplifier noise current multiplied by the total resistance
eventually dominates the noise.
The product of eN √ISUPPLY is an interesting way to
gauge low noise amplifiers. Most low noise amplifiers
with low eN have high ISUPPLY current. In applications that
require low noise voltage with the lowest possible supply
current, this product can prove to be enlightening. The
LT6233/LT6234/LT6235 have an eN √ISUPPLY product of
only 2.1 per amplifier, yet it is common to see amplifiers
with similar noise specifications to have eN √ISUPPLY as
high as 13.5.
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
Enable Pin
The LT6233 and LT6233-10 include an ENABLE pin that
shuts down the amplifier to 10A maximum supply cur-
rent. The ENABLE pin must be driven low to operate the
amplifier with normal supply current. The ENABLE pin
must be driven high to within 0.35V of V+ to shut down
the supply current. This can be accomplished with simple
gate logic; however care must be taken if the logic and the
LT6233 operate from different supplies. If this is the case,
then open-drain logic can be used with a pull-up resis-
tor to ensure that the amplifier remains off. See Typical
Performance Characteristics.
The output leakage current when disabled is very low;
however, current can flow into the input protection diodes
D1 and D2 if the output voltage exceeds the input voltage
by a diode drop.
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