参数资料
| 型号： | LTC6403IUD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DRIVER LN LP 16-QFN |
| 标准包装： | 121 |
| 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： | 管件 |
| 产品目录页面： | 1323 (CN2011-ZH PDF) |
LTC6403-1
13
64031fa
APPLICATIONS INFORMATION
When the feedback ratios mismatch (
Δβ), 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:
VV
V
OUTDIFF
OUT
INCM
OCM
AVG
=≈
() Δ
+
––
–
β
In general, the degree of feedback pair mismatch is a
source of common mode to differential conversion of
both signals and noise. Using 1% resistors or better will
mitigate most problems, and will provide about 34dB worst
case of common mode rejection. Using 0.1% resistors will
provide about 54dB of common mode rejection. A low
impedance ground plane should be used as a reference
for both the input signal source and the VOCM pin. Directly
shorting VOCM to this ground or bypassing the VOCM with
a high quality 0.1μF ceramic capacitor to this ground plane
will further mitigate against common mode signals being
converted to differential.
There may be concern on how feedback ratio mismatch
affects distortion. Distortion caused by feedback ratio mis-
match using 1% resistors or better is negligible. However,
in single supply level shifting applications where there is
a voltage difference between the input common mode
voltage and the output common mode voltage, resistor
mismatch can make the apparent voltage offset of the
amplier appear worse than specied.
The apparent input referred offset induced by feedback
ratio mismatch is derived from the above equation:
VOSDIFF(APPARENT) ≈ (VINCM – VOCM) Δβ
Using the LTC6403-1 in a single supply application on a
single 5V supply with 1% resistors, and the input common
mode grounded, with the VOCM pin biased at mid-supply,
the worst case mismatch can induce 25mV of apparent
offset voltage. With 0.1% resistors, the worst case appar-
ent offset reduces to 2.5mV.
Input Impedance and Loading Effects
The input impedance looking into the VINP or VINM input
of Figure 1 depends on whether the sources VINP and
VINM are fully differential. For balanced input sources
(VINP = –VINM), the input impedance seen at either input
is simply:
RINP = RINM = RI
For single ended inputs, because of the signal imbalance
at the input, the input impedance increases over the bal-
anced differential case. The input impedance looking into
either input is:
RR
R
RR
INP
INM
I
F
IF
==
+
1
2
–
Input signal sources with non-zero output impedances can
also cause feedback imbalance between the pair of feedback
networks. For the best performance, it is recommended
that the source’s output impedance be compensated. If
input impedance matching is required by the source, R1
should be chosen (see Figure 4):
R
RR
INM
S
INM
S
1 =
–
According to Figure 4, the input impedance looking into
the differential amp (RINM) reects the single ended source
case, thus:
R
RR
INM
I
F
IF
=
+
1
2
–
R2 is chosen to balance R1 || RS:
R
RR
IS
2 =
+
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6403IUD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifi er/Driver |
| LTC6404 | 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 |
| LTC6404-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 20Msps ADC |
| LTC6404-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.7GHz, 5V, Low Noise,Rail-to-Rail Input Differential Amplifier/Driver |
| LTC6404-4 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.7GHz, 5V, Low Noise,Rail-to-Rail Input Differential Amplifier/Driver |
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