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參數(shù)資料
| 型號： | 660025 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 差分放大器 |
| 英文描述： | Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter |
| 中文描述： | 極低噪聲，差分放大器和2.5MHz的低通濾波器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 177K |
| 代理商： | 660025 |
LT6600-2.5
6
660025i
APPLICATIOU
W
U
U
Figure 1
Figure 2
Figure 3
Interfacing to the LT6600-2.5
The LT6600-2.5 requires two equal external resistors, R
IN
,
to set the differential gain to 1580
/R
IN
. The inputs to the
filter are the voltages V
IN+
and V
IN–
presented to these
external components, Figure 1. The difference between
V
IN+
and V
IN–
is the differential input voltage. The average
of V
IN+
and V
IN–
is the common mode input voltage.
Similarly, the voltages V
OUT+
and V
OUT–
appearing at Pins
4 and 5 of the LT6600-2.5 are the filter outputs. The
difference between V
OUT+
and V
OUT–
is the differential
output voltage. The average of V
OUT+
and V
OUT–
is the
common mode output voltage.
Figure 1 illustrates the LT6600-2.5 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 2V
P-P
. The common mode
output voltage is 1.65V, and the differential output voltage
is 2V
P-P
for frequencies below 2.5MHz. The common
mode output voltage is determined by the voltage at pin 2.
Since pin 2 is shorted to pin 7, 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
Pin7.
Figure 2 shows how to AC couple signals into the
LT6600-2.5. 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 0.1
μ
F coupling capacitor and the 1580
gain setting
resistor form a high pass filter, attenuating signals below
1kHz. Larger values of coupling capacitors will propor-
tionally reduce this highpass 3dB frequency.
–
+
1580
1580
0.01
μ
F
0.1
μ
F
3.3V
–
+
V
IN
–
V
IN
+
3
4
1
7
2
8
5
6
660025 F01
V
OUT+
V
OUT–
V
t
3
2
1
V
IN+
V
IN–
V
t
3
2
1
V
OUT+
LT6600-2.5
V
OUT–
0
0
–
+
1580
1580
0.01
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
3.3V
–
LT6600-2.5
+
V
IN
+
3
4
1
7
2
8
5
6
660025 F02
V
OUT+
V
OUT–
V
3
2
2
1
V
t
1
0
0
–1
V
IN+
V
OUT+
V
OUT–
–
+
402
402
0.1
μ
F
0.01
μ
F
5V
–
LT6600-2.5
+
V
IN
–
V
IN
+
3
4
1
7
2
8
5
6
660025 F03
V
OUT+
V
OUT–
+
2V
V
t
3
2
1
0
V
IN+
V
IN–
V
t
3
2
1
0
V
OUT+
V
OUT–
500mV
P-P
(DIFF)
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