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參數(shù)資料
| 型號： | LTC6244HDD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CMOS R-R DUAL 8-DFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 35 V/µs |
| 增益帶寬積： | 50MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 6.25mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 2.8 V ~ 6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
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LTC6244
20
6244fb
Figure 8b: Output Noise Spectrum of the Circuit in Figure 8a.
Noise at 1MHz is 782nV/√Hz, Due Mostly to the Input Current
Noise Rising with Frequency
Total capacitance at the amplier’s input is now one CCM
(2.1pF) plus the photodiode capacitance CPD (1.8pF), or
about 4pF accounting for parasitics. The shunt impedance
at 1MHz, for example, is XC = 1/(2πfC) = 39.8kΩ, and
therefore, the noise gain at 1MHz is NG = 1+Rf/XC = 26.
The input voltage noise of this amplier is about 15nV/√Hz,
after accounting for the effects of R1 through R3, the
noise of the second stage and the fact that voltage noise
does rise with frequency. Multiplying the noise gain by
the input voltage noise gives an output noise density due
to voltage noise of 26 15nV/√Hz = 390nV/√Hz. But the
noise spectral density plot of Figure 8b shows an output
noise of 782nV/√Hz at 1MHz. The extra output noise is
due to input current noise, multiplied by the feedback
impedance. So while the circuit of Figure 8a does increase
bandwidth, it does not offer a noise advantage. Note,
however, that the 1.2mVRMS of noise is now measured in
a 2MHz bandwidth, instead of over a 350kHz bandwidth
of the previous example.
A Low Noise Fully Differential Buffer/Amplier
In differential signal conditioning circuits, there is often a
need to monitor a differential source without loading or
adding appreciable noise to the circuit. In addition, add-
ing gain to low level signals over appreciable bandwidth
is extremely useful. A typical application for a low noise,
high impedance, differential amplier is in the baseband
circuit of an RFID (radio frequency identication) receiver.
The baseband signal of a UHF RFID receiver is typically a
low level differential signal at the output of a demodulator
with differential output impedance in the range of 100Ω to
400Ω. The bandwidth of this signal is 1MHz or less.
The circuit of Figure 9a uses an LTC6244 to make a low
noise fully differential amplier. The amplier’s gain, input
impedance and –3dB bandwidth can be specied indepen-
dently. Knowing the desired gain, input impedance and
–3dB bandwidth, RG, CF and CIN can be calculated from
the equations shown in Figure 9b. The common mode
gain of this amplier is equal to one (VOUTCM = VINCM)
and is independent of resistor matching. The component
values in the Figure 9a circuit implement a 970kHz, gain
= 5, differential amplier with 4k input impedance. The
output differential DC offset is typically less than 500μV.
The differential input referred noise voltage density is
shown in Figure 10. The total input referred noise in a
1MHz bandwidth is 16μVRMS.
APPLICATIONS INFORMATION
50k
1M
FREQUENCY (Hz)
6244 F08b
5M
OUTPUT
NOISE
(150nV/√
Hz
/DIV)
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