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LTC2356 数据表(PDF) 13 Page - Linear Technology

部件名 LTC2356
功能描述  12-Bit, 5Msps Serial Sampling ADC in TSOT
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2356 数据表(HTML) 13 Page - Linear Technology

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LTC2315-12
13
231512f
For more information www.linear.com/2315-12
applicaTions inForMaTion
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 (<50Ω) 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 50Ω. 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 time for settling can be provided by in-
creasing the time between conversions. The best choice
for an op amp to drive the LTC2315-12 will depend on the
application.Generally,applicationsfallintotwocategories:
AC applications where dynamic specifications are most
critical and time domain applications where DC accuracy
and settling time are most critical. The following list is a
summary of the op amps that are suitable for driving the
LTC2315-12. (More detailed information is available on
the Linear Technology website at www.linear.com.)
LT6230: 215MHz GBWP, –80dBc Distortion at 1MHz,
Unity-Gain Stable, Rail-to-Rail Input and Output, 3.5mA/
Amplifier, 1.1nV/√Hz.
LT6200:165MHzGBWP,–85dBcDistortionat1MHz,Unity-
Gain Stable, R-R In and Out, 15mA/Amplifier, 0.95nV/√Hz.
LT1818/LT1819: 400MHz GBWP, –85dBc Distortion at
5MHz, Unity-Gain Stable, 9mA/Amplifier, Single/Dual
Voltage Mode Operational Amplifier.
Input Drive Circuits
TheanaloginputoftheLTC2315-12isdesignedtobedriven
single-ended with respect to GND. A low impedance source
can directly drive the high impedance analog input of the
LTC2315-12 without gain error. A high impedance source
shouldbebufferedtominimizesettlingtimeduringacquisi-
tion and to optimize the distortion performance of the ADC.
For best performance, a buffer amplifier should be used
to drive the analog input of the LTC2315-12. The amplifier
provides low output impedance to allow for fast settling
of the analog signal during the acquisition phase. It also
provides isolation between the signal source and the ADC
inputswhichdrawasmallcurrentspikeduringacquisition.
Input Filtering
The noise and distortion of the buffer amplifier and other
circuitry must be considered since they add to the ADC
noiseanddistortion.Noisyinputcircuitryshouldbefiltered
prior to the analog inputs to minimize noise. A simple
1-pole RC filter is sufficient for many applications.
Large filter RC time constants slow down the settling at
the analog inputs. It is important that the overall RC time
constants be short enough to allow the analog inputs to
completelysettleto>12-bitresolutionwithintheminimum
acquisition time (tACQ-MIN) of 40ns.
47pF
50
2315112 F10
AIN
LTC2315-12
LT1818
GND
ANALOG IN
+
Figure 10. RC Input Filter
A simple 1-pole RC filter is sufficient for many applica-
tions. For example, Figure 10 shows a recommended
single-ended buffered drive circuit using the LT1818 in
unity gain mode. The 47pF capacitor from AIN to ground
and 50Ω source resistor limits the input bandwidth to
68MHz. The 47pF capacitor also acts as a charge reservoir
for the input sample-and-hold and isolates the LT1818
from sampling glitch kick-back. The 50Ω source resistor
is used to help stabilize the settling response of the drive
amplifier. When choosing values of source resistance
and shunt capacitance, the drive amplifier data sheet
should be consulted and followed for optimum settling
response. If lower input bandwidths are desired, care
should be taken to optimize the settling response of the
driver amplifier with higher values of shunt capacitance
or series resistance. High quality capacitors and resistors
should be used in the RC filter since these components
canadddistortion.NP0/C0Gandsilvermicatypedielectric
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 resistors are much less susceptible to both


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