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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： | 4/16页 |
| 文件大小： | 209K |
| 代理商： | LTC6604IUFF-10#TRPBF |
LT6604-10
12
660410fa
Common Mode DC Currents
In applications like Figure 1 and Figure 3 where the LT6604-
10 not only provides lowpass ltering but also level shifts
the common mode voltage of the input signal, DC currents
will be generated through the DC path between input and
output terminals. Minimize these currents to decrease
power dissipation and distortion. Consider the application
in Figure 3. VMID sets the output common mode voltage of
the 1st differential amplier inside the LT6604-10 channel
(see the Block Diagram section) at 2.5V. Since the input
common mode voltage is near 0V, there will be approxi-
mately a total of 2.5V drop across the series combination
of the internal 402Ω feedback resistor and the external
100Ω input resistor. The resulting 5mA common mode
DC current in each input path, must be absorbed by the
sources VIN+ and VIN–. VOCM sets the common mode
output voltage of the 2nd differential amplier inside the
LT6604-10 channel, and therefore sets the common mode
output voltage of the lter. Since, in the example of Figure
3, VOCM differs from VMID by 0.5V, an additional 2.5mA
(1.25mA per side) of DC current will ow in the resistors
coupling the 1st differential amplier output stage to the
lter output. Thus, a total of 12.5mA per channel is used
to translate the common mode voltages.
A simple modication to Figure 3 will reduce the DC com-
mon mode currents by 36%. If VMID is shorted to VOCM
the common mode output voltage of both op amp stages
will be 2V and the resulting DC current will be 8mA per
channel. Of course, by AC coupling the inputs of Figure 3,
the common mode DC current can be reduced to 2.5mA
per channel.
Noise
The noise performance of the LT6604-10 channel can be
evaluated with the circuit of Figure 6. Given the low noise
output of the LT6604-10 and the 6dB attenuation of the
transformer coupling network, it will be necessary to mea-
sure the noise oor of the spectrum analyzer and subtract
the instrument noise from the lter noise measurement.
Example: With the IC removed and the 25Ω resistors
grounded, Figure 6, measure the total integrated noise (eS)
of the spectrum analyzer from 10kHz to 10MHz. With the
IC inserted, the signal source (VIN) disconnected, and the
input resistors grounded, measure the total integrated noise
out of the lter (eO). With the signal source connected,
set the frequency to 1MHz and adjust the amplitude until
VIN measures 100mVP-P. Measure the output amplitude,
VOUT, and compute the passband gain A = VOUT/VIN. Now
compute the input referred integrated noise (eIN) as:
eIN =
(eO)
2 –(e
S )
2
A
Table 1 lists the typical input referred integrated noise for
various values of RIN.
Table 1. Noise Performance
PASSBAND
GAIN
RIN
INPUT REFERRED
INTEGRATED NOISE
10kHz TO 10MHz
INPUT REFERRED
NOISE dBm/Hz
4
100Ω
24μVRMS
–149
2
200Ω
34μVRMS
–146
1
402Ω
56μVRMS
–142
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相关代理商/技术参数 |
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| LTC6604IUFF-15-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Very Low Noise, Differential Amplifi er and 15MHz Lowpass Filter |
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