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參數(shù)資料
| 型號(hào)： | LT6402CUD-20#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF AMP/ADC DRVR 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 400 V/µs |
| -3db帶寬： | 300MHz |
| 電流 - 輸入偏壓： | 5µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 30mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 5.5 V，±2 V ~ 2.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1322 (CN2011-ZH PDF) |
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LT6402-20
12
640220fa
APPLICATIO S I FOR ATIO
WU
U
Filtered Applications
(Using the +OUTFILTERED and –OUTFILTERED Pins)
Filtering at the output of the LT6402-20 is often desired
to provide either anti-aliasing or improved signal to noise
ratio. To simplify this ltering, the LT6402-20 includes an
additional pair of differential outputs (+OUTFILTERED and
–OUTFILTERED) which incorporate an internal lowpass
lter network with a –3dB bandwidth of 75MHz (Figure 5).
These pins each have an output impedance of 50Ω. Inter-
nal capacitances are 14pF to VEE on each ltered output,
plus an additional 14pF capacitor connected differentially
between the two ltered outputs. This resistor/capaci-
tor combination creates ltered outputs that look like a
series 50Ω resistor with a 42pF capacitor shunting each
ltered output to AC ground, giving a –3dB bandwidth of
75MHz.
The lter cutoff frequency is easily modied with just a
few external components. To increase the cutoff frequency,
simply add 2 equal value resistors, one between +OUT and
+OUTFILTERED and the other between –OUT and –OUTFIL-
TERED (Figure 6). These resistors are in parallel with the
internal 50Ω resistor, lowering the overall resistance and
increasing lter bandwidth. To double the lter bandwidth,
for example, add two external 50Ω resistors to lower the
series resistance to 25Ω. The 42pF of capacitance remains
unchanged, so lter bandwidth doubles.
To decrease lter bandwidth, add two external capacitors,
one from +OUTFILTERED to ground, and the other from
–OUTFILTERED to ground. A single differential capacitor
connected between +OUTFILTERED and –OUTFILTERED
can also be used, but since it is being driven differentially
it will appear at each ltered output as a single-ended
capacitance of twice the value. To halve the lter band-
width, for example, two 42pF capacitors could be added
(one from each ltered output to ground). Alternatively
one 21pF capacitor could be added between the ltered
outputs, again halving the lter bandwidth. Combinations
of capacitors could be used as well; a three capacitor
Figure 5. LT6402-20 Internal Filter Topology –3dB BW ≈75MHz
Figure 6. LT6402-20 Internal Filter Topology Modied
for 2x Filter Bandwidth (2 External Resistors)
Figure 7. LT6402-20 Internal Filter Topology Modied
for 1/2x Filter Bandwidth (3 External Capacitors)
6402 F05
50
VEE
14pF
LT6402-20
–OUT
+OUT
50
14pF
–OUTFILTERED
+OUTFILTERED
8
7
6
5
FILTERED OUTPUT
(75MHz)
VEE
6402 F06
50
50
14pF
LT6402-20
–OUT
+OUT
50
50
14pF
–OUTFILTERED
FILTERED OUTPUT
(150MHz)
+OUTFILTERED
8
7
6
5
VEE
6402 F07
50
14pF
LT6402-20
–OUT
+OUT
50
14pF
–OUTFILTERED
+OUTFILTERED
8
7
6
5
FILTERED OUTPUT
(37.5MHz)
Figure 8. LT6402-20 Output Filter Modied for Bandpass
Filtering (1 External Inductor, 1 External Capacitor)
VEE
6402 F08
50
14pF
LT6402-20
–OUT
+OUT
50
14pF
–OUTFILTERED
+OUTFILTERED
8
7
6
5
FILTERED OUTPUT
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