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参数资料
| 型号： | LTC2356CMSE-14#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 2/16页 |
| 文件大小： | 266K |
| 代理商： | LTC2356CMSE-14#TR |
10
LTC2356-12/LTC2356-14
2356f
DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC2356-12/LTC2356-14
maybedrivendifferentiallyorasasingle-endedinput(i.e.,the
AIN– input is set to VCM). Both differential analog inputs,
AIN+ and AIN–, are sampled at the same instant. Any
unwanted signal that is common to both inputs of each input
pair will be reduced by the common mode rejection of the
sample-and-hold circuit. The inputs draw only one small
current spike while charging the sample-and-hold capacitors
at the end of conversion. During conversion, the analog
inputs draw only a small leakage current. If the source
impedance of the driving circuit is low, then the LTC2356-12/
LTC2356-14 inputs can be driven directly. As source
impedance increases, so will acquisition time. For minimum
acquisition time with high source impedance, a buffer
amplifier must be used. The main requirement is that the
amplifier driving the analog input(s) must settle after the
small current spike before the next conversion starts (settling
time must be 39ns for full throughput rate). Also keep in mind
while choosing an input amplifier the amount of noise and
harmonic distortion added by the amplifier.
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 sam-
pling capacitor, choose an amplifier that has a low output
impedance(<100
)attheclosed-loopbandwidthfrequency.
For example, if an amplifier is used with a gain of 1 and has
a unity-gain bandwidth of 50MHz, then the output impedance
at 50MHz must be less than 100
. The second requirement
is that the closed-loop bandwidth must be greater than
40MHz to ensure adequate small-signal settling for full
throughput rate. If slower op amps are used, more time for
settling can be provided by increasing the time between
conversions. The best choice for an op amp to drive the
LTC2356-12/LTC2356-14 will depend on the application.
Generally, applications fall into two categories: AC applica-
tions 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 LTC2356-12/LTC2356-14.
(More detailed information is available in the Linear Technol-
ogy Databooks and our website at www.linear.com.)
LTC1566-1:LowNoise2.3MHzContinuousTimeLow-Pass
Filter.
LT
1630: Dual 30MHz Rail-to-Rail Voltage FB Amplifier.
2.7V to
±15V supplies. Very high AVOL, 500V offset and
520ns settling to 0.5LSB for a 4V swing. THD and noise are
–93dB to 40kHz and below 1LSB to 320kHz (AV = 1, 2VP-P
into 1k
, VS = 5V), making the part excellent for AC
applications (to 1/3 Nyquist) where rail-to-rail performance
is desired. Quad version is available as LT1631.
LT1632:Dual 45MHz Rail-to-Rail Voltage FB Amplifier. 2.7V
to
±15V supplies. Very high AVOL, 1.5mV offset and 400ns
settling to 0.5LSB for a 4V swing. It is suitable for applica-
tions with a single 5V supply. THD and noise are
–93dB to 40kHz and below 1LSB to 800kHz (AV = 1,
2VP-P into 1k, VS = 5V), making the part excellent for AC
applications where rail-to-rail performance is desired. Quad
version is available as LT1633.
LT1813: Dual 100MHz 750V/
s 3mA Voltage Feedback
Amplifier. 5V to
±5V supplies. Distortion is –86dB to 100kHz
and –77dB to 1MHz with
±5V supplies (2VP-P into 500).
Excellent part for fast AC applications with
±5V supplies.
LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/Amplifier,
8.5nV/
√Hz.
LT1806/LT1807:325MHzGBWP,–80dBcDistortionat5MHz,
Unity-GainStable,R-RInandOut,10mA/Amplifier,3.5nV/
√Hz.
LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz,
Unity-GainStable,R-RInandOut,15mA/Amplifier,16nV/
√Hz.
LT1818/LT1819: 400MHz, 2500V/
s,9mA,Single/DualVolt-
age Mode Operational Amplifier.
LT6200: 165MHz GBWP, –85dBc Distortion at 1MHz, Unity-
Gain Stable, R-R In and Out, 15mA/Amplifier,
0.95nV/
√Hz.
LT6203: 100MHz GBWP, –80dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 3mA/Amplifier,
1.9nV/
√Hz.
LT6600-10: Amplifier/Filter Differential In/Out with 10MHz
Cutoff.
APPLICATIO S I FOR ATIO
WU
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