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参数资料
| 型号： | LTC6405IUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC DIFF AMP/DRIVER R-R 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) |
LTC6405
15
6405fb
For more information www.linear.com/6405
applications inForMation
General Amplifier Applications
As levels of integration have increased and correspond-
ingly, system supply voltages decreased, there has been
a need for ADCs to process signals differentially in order
to maintain good signal to noise ratios. These ADCs are
typically supplied from a single supply voltage which
can be as low as 3V, and will have an optimal common
mode input range of 1.25V or 1.5V. The LTC6405 makes
interfacing to these ADCs easy, by providing both single-
ended to differential conversion as well as common mode
level shifting. The gain to VOUTDIFF from VINM and VINP is:
VOUTDIFF = V+OUT – V–OUT ≈
RF
RI
VINP – VINM
(
)
Note from the above equation, the differential output volt-
age (V+OUT – V–OUT) is completely independent of input
and output common mode voltages, or the voltage at the
commonmodepin.ThismakestheLTC6405ideallysuited
forpre-amplification,levelshiftingandconversionofsingle
ended signals to differential output signals in preparation
for driving differential input ADCs.
Effects of Resistor Pair Mismatch
Figure 3 shows a circuit diagram which takes into consid-
eration that real world resistors will not match perfectly.
Assuming infinite open loop gain, the differential output
relationship is given by the equation:
VOUTDIFF = V+OUT – V–OUT
RF
RI
VINDIFF +
b
bAVG
VICM –
b
bAVG
VOCM
where:
RF is the average of RF1, and RF2, and RI is the average
of RI1, and RI2.
bAVG is defined as the average feedback factor from the
outputs to their respective inputs:
bAVG =
1
2
RI1
RI1+RF1
+
RI2
RI2 +RF2
b is defined as the difference in feedback factors:
b =
RI2
RI2 +RF2
–
RI1
RI1+RF1
VICMisdefinedastheaverageofthetwoinputvoltagesVINP
and VINM (also called the input common mode voltage):
VICM =
1
2
VINP + VINM
(
)
and VINDIFF is defined as the difference of the input voltages:
VINDIFF = VINP – VINM
VOCM is defined as the average of the two output voltages
V+OUT and V–OUT:
VOCM =
V+OUT + VOUT
2
When the feedback ratios mismatch (
b), common mode
to differential conversion occurs.
Setting the differential input to zero (VINDIFF = 0), the de-
gree of common mode to differential conversion is given
by the equation:
VOUTDIFF = V+OUT – V–OUT ≈ VICM – VOCM
(
) b
bAVG
Figure 3. Real-World Application with
Feedback Resistor Pair Mismatch
–
+
RF2
V–OUT
V+OUT
VVOCM
VOCM
6405 F03
RF1
RI2
RI1
+
–
VINP
–
+
VINM
V–IN
V+IN
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相关代理商/技术参数 |
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| LTC6406 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6406CMS8E#PBF | 功能描述:IC AMP/DRIVER DIFF 8-MSOP 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 |
| LTC6406CMS8E#TRPBF | 功能描述:IC AMP/DRIVER DIFF 8-MSOP 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 |
| LTC6406CMS8E-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3GHz, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
| LTC6406CMS8E-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3GHz, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
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