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參數(shù)資料
| 型號(hào)： | LTC1420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 12-Bit, 10Msps, Sampling ADC(12位, 10Msps,采樣模數(shù)轉(zhuǎn)換器) |
| 中文描述： | 12位，10Msps的器件，采樣ADC（12位，10Msps的器件，采樣模數(shù)轉(zhuǎn)換器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 272K |
| 代理商： | LTC1420 |
11
LTC1420
1420 F08a
+A
IN
V
SS
V
IN
470pF
15
15
MINI CIRCUITS
T1-1T
1
μ
F
LTC1420
5V
–A
IN
V
CM
1420 F08b
+A
IN
V
SS
V
IN
MINI CIRCUITS
T1-1T
1
μ
F
LTC1420
5V
–5V
–A
IN
V
CM
470pF
15
15
Figure 8a. Single Supply Transformer Coupled Input
Figure 8b. Dual Supply Transformer Coupled Input
+A
IN
V
IN
LTC1420
–A
IN
470pF
30
Figure 9. RC Input Filter
APPLICATIO
S I
FOR
ATIO
U
Differential Operation
The THD and SFDR performance of the LTC1420 can be
improved by using a center tap RF transformer to drive the
inputs differentially. Though the signal can no longer be
DC coupled, the improvement in dynamic performance
makes this an attractive solution for some applications.
Typical connections for single and dual supply systems
are shown in Figures 8a and 8b. Good choices for trans-
formers are the Mini Circuits T1-1T (1:1 turns ratio) and
T4-6T (1:4 turns ratio). For best results, the transformer
should be located close to the LTC1420 on the printed
circuit board.
W
U
U
Choosing an Input Amplifier
Choosing an input amplifier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplifier from charging
the sampling capacitor, choose an amplifier that has a low
output impedance (<100
) at the closed-loop bandwidth
frequency. For example, if an amplifier is used in a gain of
1 and has a unity-gain bandwidth of 100MHz, then the
output impedance at 100MHz must be less than 100
.
The second requirement is that the closed-loop bandwidth
must be greater than 100MHz to ensure adequate small-
signal settling for full throughput rate. If slower op amps
are used, more settling time can be provided by increasing
the time between conversions.
The best choice for an op amp to drive the LTC1420 will
depend on the application. Generally applications fall into
two categories: AC applications where dynamic specifica-
tions are most critical and time domain applications where
DC accuracy and settling time are most critical.
Input Filtering
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC1420 noise and distortion. The small-signal band-
width of the sample-and-hold circuit is 100MHz. Any noise
or distortion products that are present at the analog inputs
will be summed over this entire bandwidth. Noisy input
circuitry should be filtered prior to the analog inputs to
minimize noise. A simple 1-pole RC filter is sufficient for
many applications.
For example, Figure 9 shows a 470pF capacitor from +A
IN
to –A
IN
and a 30
source resistor to limit the input
bandwidth to 11.3MHz. The 470pF capacitor also acts as
a charge reservoir for the input sample-and-hold and
isolates the amplifier driving V
IN
from the ADC’s small
current glitch. In undersampling applications, an input
capacitor this large may prohibitively limit the input band-
width. If this is the case, use as large an input capacitance
as possible. High quality capacitors and resistors should
be used since these components can add distortion. NPO
and silver mica type dielectric capacitors have excellent
linearity. Carbon surface mount resistors can generate
distortion from self-heating and from damage that may
occur during soldering. Metal film surface mount resis-
tors are much less susceptible to both problems.
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