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參數(shù)資料
| 型號： | LT6411IUD#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRVR/GAIN AMP 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 3300 V/µs |
| -3db帶寬： | 650MHz |
| 電流 - 輸入偏壓： | 17µA |
| 電壓 - 輸入偏移： | 3000µV |
| 電流 - 電源： | 8mA |
| 電流 - 輸出 / 通道： | 105mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
LT6411
11
6411f
the output signals can be AC coupled and DC biased in a
manner similar to what is shown at the inputs in Figure
3. A simpler alternative when using an ADC such as the
LTC2249 is to use the ADC’s VCM pin to set the optimal
common mode voltage as shown in Figure 5.
If unity common mode gain and difference mode response
to DC is desired, there is another conguration available.
Figure 6 shows the LT6411 connected to provide a differ-
ential signal gain of +3 with unity common mode gain. For
differential signal gain between unity and +3, three resistors
can be added to provide attenuation and set the differential
input impedance of the stage as illustrated in Figure 7. The
general expression for the differential gain is:
A
k
VDIFF
()
=+
+
1
2
Scaling factor ‘k’ is the multiple between the two equal-
value series input resistors and the resistor connected
between the two positive inputs. The correct value of R for
the external resistors can be computed from the desired
differential input impedance, ZIN, as a function of k and
the 370
Ω internal gain setting resistors, as described in
the equation:
R
Z
kZ
k
IN
=
+
()
+
()
–
370
2
1
In Figure 7 k = 2 and R = 13.7
Ω, setting the differential
gain to +2 and the differential input impedance to ap-
proximately 50
Ω.
APPLICATIONS INFORMATION
+
–
+
–
+V
–V
CLARGE
10k
LT6411
IN+
IN–
OV
6411 F05
CLARGE
10k
2.2
F
LTC2249
VCM
+
–
+
–
+V
LT6411
IN+
IN–
VCM
OUT+
OUT–
VCM
6411 F06
Figure 6. LT6411 Congured for a Differential Gain of +3
and Unity Common Mode Gain with Response to DC
Figure 5. Level Shifting the Output Common Mode Voltage of the LT6411 Using the VCM Pin of an LTC2249
+
–
+
–
+V
LT6411
IN+
R = 13.7
R = 13.7
IN–
k R = 27.4
VCM
OUT+
OUT–
VCM
6411 F07
Figure 7. LT6411 Congured with a Differential Input Impedance
of 50
Ω, a Differential Gain of +2 and Unity Common Mode Gain
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