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參數(shù)資料
| 型號： | LT6604IUFF-2.5#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF LN DUAL 34-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 電流 - 輸入偏壓： | 15µA |
| 電壓 - 輸入偏移： | 5000µV |
| 電流 - 電源： | 28mA |
| 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： | 帶卷 (TR) |
LT6604-2.5
11
660425fa
APPLICATIONS INFORMATION
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, as shown in Table 1. The voltage on VOCM should
not be more than 1V below the voltage on VMID. VOCM is
a high impedance input.
Table 1. Output Common Mode Range for Various Supplies
SUPPLY
VOLTAGE
DIFFERENTIAL OUT
VOLTAGE SWING
OUTPUT COMMON MODE RANGE
FOR LOW DISTORTION
3V
4VP-P
2VP-P
1VP-P
1.4V ≤ VOCM ≤ 1.6V
1V ≤ VOCM ≤ 1.6V
0.75V ≤ VOCM ≤ 1.6V
5V
8VP-P
4VP-P
2VP-P
1VP-P
2.4V ≤ VOCM ≤ 2.6V
1.5V ≤ VOCM ≤ 3.5V
1V ≤ VOCM ≤ 3.75V
0.75V ≤ VOCM ≤ 3.75V
±5V
9VP-P
4VP-P
2VP-P
1VP-P
–2V ≤ VOCM ≤ 2V
–3.5V ≤ VOCM ≤ 3.5V
–3.75V ≤ VOCM ≤ 3.75V
–4.25V ≤ VOCM ≤ 3.75V
NOTE: The voltage at VOCM should not be more than 1V below the voltage
at VMID. To achieve some of the output common mode ranges shown in the
table, the voltage at VMID must be set externally to a value below mid supply.
The LT6604-2.5 was designed to process a variety of
input signals including signals centered on the mid-sup-
ply 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 “Electrical
Characteristics”).
Common Mode DC Currents
In applications like Figure 1 and Figure 3 where the LT6604-
2.5 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 LT6604-2.5 channel (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 1580Ω feedback
resistor and the external 402Ω input resistor. The result-
ing 1.25mA 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 LT6604-2.5 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 625μA (312μA 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 3.125mA
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 2mA. Of
course, by AC-coupling the inputs of Figure 3, the common
mode DC current can be reduced to 625μA.
Noise
The noise performance of the LT6604-2.5 channel can be
evaluated with the circuit of Figure 6. Given the low noise
output of the LT6604-2.5 and the 6dB attenuation of the
transformer coupling network, it is necessary to measure
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 2.5MHz. With the
IC inserted, the signal source (VIN) disconnected, and the
Figure 6
–
+
0.1μF
2.5V
–2.5V
–
+
1/2
LT6604-2.5
RIN
25Ω
660425 F06
SPECTRUM
ANALYZER
INPUT
50Ω
VIN
COILCRAFT
TTWB-1010
1:1
25
27
4
34
6
2
29
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT6604IUFF-5#PBF | 功能描述:IC AMP DIFF LN DUAL 34-QFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
| LT6604IUFF-5#TRPBF | 功能描述:IC AMP DIFF LN DUAL 34-QFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
| LT6604IUFF-5-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter |
| LT6604IUFF-5-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter |
| LT660Z | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:GREEN OVAL LAMP LED |
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