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參數(shù)資料
| 型號： | LTC6400IUD-8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF 2.2GHZ 16QFN |
| 標準包裝： | 121 |
| 類型： | ADC 驅(qū)動器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 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 |
LTC6400-8
11
64008f
Figure 5. LTC6400-8 Internal Filter Topology Modied for Low
Filter Bandwidth (Three External Capacitors)
64008 F05
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
200Ω
12.5Ω
500Ω
LTC6400-8
200Ω
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
8pF
12pF
FILTERED OUTPUT
(87.5MHz)
Figure 6. LTC6400-8 Modied 165MHz for Bandpass Filtering
(Three External Capacitors, One External Inductor)
Output Impedance Match and Filter
The LTC6400-8 can drive an ADC directly without external
output impedance matching. Alternatively, the differential
output impedance of 25Ω can be made larger, e.g. 50Ω,
by series resistors or LC network.
The internal low pass lter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitors
can reduce the lowpass lter bandwidth as shown in
Figure 5. A bandpass lter is easily implemented with
Figure 7. Single-Ended Input to LTC6400-8 and LTC2208
only a few components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
lter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
Output Common Mode Adjustment
The LTC6400-8’s output common mode voltage is set
by the VOCM pin, which is a high impedance input. The
output common mode voltage is capable of tracking VOCM
in a range from 1V to 1.6V. Bandwidth of VOCM control is
typically 14MHz, which is dominated by a low pass lter
connected to the VOCM pin and is aimed to reduce com-
mon mode noise generation at the outputs. The internal
common mode feedback loop has a –3dB bandwidth
around 400MHz, allowing fast rejection of any common
mode output voltage disturbance. The VOCM pin should
be tied to a DC bias voltage with a 0.1μF bypass capaci-
tor. When interfacing with 3V A/D converters such as the
LT22xx families, the VOCM pin can be connected to the
VCM pin of the ADC.
Driving A/D Converters
The LTC6400-8 has been specically designed to interface
directly with high speed A/D converters. Figure 7 shows the
LTC6400-8 with single-ended input driving the LTC2208,
which is a 16-bit, 130Msps ADC. Two external 5Ω resistors
help eliminate potential resonance associated with bond
wires of either the ADC input or the driver output. VOCM
of the LTC6400-8 is connected to VCM of the LTC2208 at
1.25V. Alternatively, an input single-ended signal can be
converted to differential signal via a balun and fed to the
input of the LTC6400-8.
APPLICATIONS INFORMATION
64008 F06
IN+
OUT–
IN–
OUT+
200Ω
12.5Ω
500Ω
LTC6400-8
LTC2208
200Ω
500Ω
12.5Ω
10Ω
4.99Ω
50Ω
13
14
15
16
7
5
6
8
39pF
16nH
39pF
+OUT
+OUTF
–OUTF
–OUT
+IN
–IN
2.7pF
39pF
27.4Ω
59.0Ω
0.1μF
64008 F07
LTC6400-8
VOCM
ENABLE
LTC2208
4.99Ω
0.1μF
LTC2208 130Msps
16-Bit ADC
1.25V
4.99Ω
8dB GAIN
+OUT
+OUTF
–OUTF
–OUT
AIN–
AIN+
VCM
–IN
+IN
IF IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6400IUD-8-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-300MHz |
| LTC6400-X | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4GHz to 6GHz High Dynamic Range Downconverting Mixer |
| LTC6401-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6401-20 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401-26 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.6GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
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