参数资料
| 型号： | LTC6404IUD-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DRIVER DIFF 16-QFN |
| 标准包装： | 2,500 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
LTC6404
23
6404f
In single supply applications, where the LTC6404 is used
to interface to an ADC, the optimal common mode input
range to the ADC is often determined by the ADC’s refer-
ence. If the ADC makes a reference available for setting
the input common mode voltage, it can be directly tied
to the VOCM pin, but must be capable of driving the input
impedance presented by the VOCM as listed in the Electri-
cal Characteristics Table. This impedance can be assumed
to be connected to a mid-supply potential. If an external
reference drives the VOCM pin, it should still be bypassed
with a high quality 0.01μF or larger capacitor to a low
impedance ground plane to lter any thermal noise and
to prevent common mode signals on this pin from being
inadvertently converted to differential signals.
Output Filter Considerations and Use
Filtering at the output of the LTC6404 is often desired to
provide either anti-aliasing or improved signal to noise
ratio. To simplify this ltering, the LTC6404 includes an
additional pair of differential outputs (OUTF+ and OUTF–)
which incorporate an internal lowpass lter network with
a –3dB bandwidth of 88.5MHz (Figure 6).
These pins each have a DC output impedance of 50
Ω. In-
ternal capacitances are 12pF to V– on each ltered output,
plus an additional 12pF capacitor connected differentially
between the two ltered outputs. This resistor/capacitor
combination creates ltered outputs that look like a series
50
Ω resistor with a 36pF capacitor shunting each ltered
output to AC ground, providing a –3dB bandwidth of
APPLICATIONS INFORMATION
88.5MHz, and a noise bandwidth of 139MHz. 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 OUTF+ and the
other between OUT– and OUTF– (Figure 7). These resistors,
in parallel with the internal 50
Ω resistor, lower the overall
resistance and therefore increase lter bandwidth. For
example, to double the lter bandwidth, add two external
50
Ω resistors to lower the series lter resistance to 25Ω.
The 36pF of capacitance remains unchanged, so lter
bandwidth doubles. Keep in mind, the series resistance
also serves to decouple the outputs from load capacitance.
The unltered outputs of the LTC6404 are designed to
drive 10pF to ground or 5pF differentially, so care should
be taken to not lower the effective impedance between
OUT+ and OUTF+ or OUT– and OUTF– below 25
Ω.
To decrease lter bandwidth, add two external capacitors,
one from OUTF+ to ground, and the other from OUTF– to
ground. A single differential capacitor connected between
OUTF+ and OUTF– 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 bandwidth, for example, two 36pF capacitors
could be added (one from each ltered output to ground).
Alternatively, one 18pF capacitor could be added between
the ltered outputs, again halving the lter bandwidth.
Combinations of capacitors could be used as well; a three
Figure 7. LTC6404 Filter Topology Modied for 2x Filter
Bandwidth (2 External Resistors)
Figure 6. LTC6404 Internal Filter Topology
–
+
7
OUT+
8
OUTF+
14
OUT–
13
OUTF–
12
V–
9
V–
6404 F06
LTC6404
FILTERED OUTPUT
(88.5MHz)
50Ω
12pF
50Ω
–
+
7
OUT+
8
OUTF+
14
OUT–
13
OUTF–
12
V–
9
V–
6404 F07
LTC6404
FILTERED OUTPUT
(176MHz)
50Ω
49.9Ω
12pF
50Ω
49.9Ω
相关PDF资料 |
PDF描述 |
|---|---|
| AD8138ARZ-RL | IC AMP DIFF LDIST LP 95MA 8SOIC |
| VE-24M-IV-F1 | CONVERTER MOD DC/DC 10V 150W |
| VI-2T0-MW-B1 | CONVERTER MOD DC/DC 5V 100W |
| AD8138ARMZ-REEL | IC AMP DIFF LDIST LP 95MA 8MSOP |
| VE-24L-IV-F4 | CONVERTER MOD DC/DC 28V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6404IUD-2#PBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6404IUD-2#TRPBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6404IUD-2-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-4#PBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
发布紧急采购，3分钟左右您将得到回复。