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參數(shù)資料
| 型號： | LT6604IUFF-5#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF LN DUAL 34-QFN |
| 標(biāo)準(zhǔn)包裝： | 52 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 電流 - 輸入偏壓： | 30µA |
| 電壓 - 輸入偏移： | 8000µV |
| 電流 - 電源： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 11 V，±1.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 34-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 34-QFN-EP（4x7） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1322 (CN2011-ZH PDF) |
LT6604-5
11
66045fa
APPLICATIONS INFORMATION
The two ampliers inside the LT6604-5 channel have in-
dependent control of their output common mode voltage
(see the Block Diagram section). The following guidelines
will optimize the performance of the lter.
VMID can be allowed to oat, but it must be bypassed to an
AC ground with a 0.01μF capacitor or some instability may
be observed. VMID can be driven from a low impedance
source, provided it remains at least 1.5V above V– and at
least 1.5V below V+. An internal resistor divider sets the
voltage of VMID. While the internal 11k resistors are well
matched, their absolute value can vary by ±20%. This
should be taken into consideration when connecting an
external resistor network to alter the voltage of VMID.
VOCM can be shorted to VMID for simplicity. If a different
common mode output voltage is required, connect VOCM
to a voltage source or resistor network. For 3V and 3.3V
supplies the voltage at VOCM must be less than or equal
to the mid supply level. For example, voltage (VOCM) ≤
1.65V on a single 3.3V supply. For power supply voltages
higher than 3.3V the voltage at VOCM can be set above mid
supply. The voltage on VOCM should not be more than 1V
below the voltage on VMID. The voltage on VOCM should
not be more than 2V above the voltage on VMID. VOCM is
a high impedance input.
The LT6604-5 was designed to process a variety of input
signals including signals centered on the mid supply
voltage and signals that swing between ground and a
positive voltage in a single supply system (Figure 1). The
allowable range of the input common mode voltage (the
average of VIN+ and VIN– in Figure 1) is determined by
the power supply level and gain setting (see the Electrical
Characteristics section).
Common Mode DC Currents
In applications like Figure 1 and Figure 3 where the LT6604-5
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 LT6604-5 (see the Block Diagram section) at
2.5V. Since the input common mode voltage is near 0V,
there will be approximately a total of 2.5V drop across the
series combination of the internal 806Ω feedback resistor
and the external 200Ω input resistor. The resulting 2.5mA
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 LT6604-5 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 1.25mA (625μA 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 6.25mA
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 4mA. Of course,
by AC coupling the inputs of Figure 3 and shorting VMID to
VOCM, the common mode DC current is eliminated.
Figure 6. Differential Voltage Range
1MHz INPUT LEVEL (VP-P)
0
20
0
–20
–40
–60
–80
–100
–120
35
6600 F06
12
46
7
OUTPUT
LEVEL
(dBV)
1dB PASSBAND GAIN
COMPRESSION POINTS
1MHz TA = 25°C
1MHz TA = 85°C
3RD HARMONIC
TA = 85°C
3RD HARMONIC
TA = 25°C
2ND HARMONIC
TA = 25°C, GAIN = 1
2ND HARMONIC
TA = 85°C
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