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参数资料
| 型号： | LTC6604IUFF-10#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQCC34 |
| 封装： | 4 X 7 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-34 |
| 文件页数： | 16/16页 |
| 文件大小： | 209K |
| 代理商： | LTC6604IUFF-10#TRPBF |
LT6604-10
9
660410fa
APPLICATIONS INFORMATION
Interfacing to the LT6604-10
Note: The LT6604-10 contains two identical lters. The
following applications information only refers to one lter.
The two lters are independent except that they share the
same negative supply voltage V–. The two lters can be
used simultaneously by replicating the example circuits.
The referenced pin numbers correspond to the A channel
lter
The LT6604-10 channel requires two equal external re-
sistors, RIN, to set the differential gain to 402Ω/RIN. The
inputs to the lter are the voltages VIN+ and VIN– presented
to these external components, Figure 1. The difference
between VIN+ and VIN– is the differential input voltage. The
average of VIN+andVIN–isthecommonmodeinputvoltage.
Similarly, the voltages VOUT+ and VOUT– appearing at Pins
27 and 29 of the LT6604-10 are the lter outputs. The dif-
ference between VOUT+ and VOUT– is the differential output
voltage. The average of VOUT+ and VOUT– is the common
mode output voltage. Figure 1 illustrates the LT6604-10
operating with a single 3.3V supply and unity passband
gain; the input signal is DC coupled. The common mode
input voltage is 0.5V, and the differential input voltage is
2VP-P. The common mode output voltage is 1.65V, and the
differential output voltage is 2VP-P for frequencies below
10MHz. The common mode output voltage is determined
by the voltage at VOCM. Since VOCM is shorted to VMID,
the output common mode is the mid-supply voltage. In
addition, the common mode input voltage can be equal
to the mid-supply voltage of VMID.
Figure 2 shows how to AC couple signals into the LT6604-
10. In this instance, the input is a single-ended signal.
AC coupling allows the processing of single-ended or
differential signals with arbitrary common mode levels.
The 0.1μF coupling capacitor and the 402Ω gain setting
resistor form a high pass lter, attenuating signals below
4kHz. Larger values of coupling capacitors will proportion-
ally reduce this highpass 3dB frequency.
–
+
402Ω
0.01μF
0.1μF
3.3V
–
+
VIN
–
VIN
+
25
27
4
34
6
2
29
7
660410 F01
VOUT
+
VOUT
–
V
t
3
2
1
VIN
+
VIN
–
V
t
3
2
1
VOUT
+
VOUT
–
0
1/2
LT6604-10
–
+
402Ω
0.01μF
0.1μF
3.3V
–
+
VIN
+
25
27
4
34
6
2
29
7
660410 F02
VOUT
+
VOUT
–
V
3
2
1
V
t
1
0
–1
VIN
+
VOUT
+
VOUT
–
1/2
LT6604-10
Figure 1
Figure 2
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