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參數(shù)資料
| 型號(hào)： | DC1082A-F |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/18頁 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2355-14 |
| 軟件下載： | QuikEval II System |
| 設(shè)計(jì)資源： | DC1082A Design File DC1082A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval-II™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 3M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 輸入范圍： | 0 ~ 2.5 V |
| 已用 IC / 零件： | LTC2355-14 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2355IMSE-14#TRPBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-14#TRPBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-12#TRPBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355IMSE-12#TRPBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355IMSE-14#PBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355IMSE-12#PBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355CMSE-14#PBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-12#PBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP |
LTC2355-12/LTC2355-14
0
2355fa
DRIVING THE ANALOG INPUT
ThedifferentialanaloginputsoftheLTC2355-12/LTC2355-14
may be driven differentially or as a single-ended input (i.e.,
the AIN– input is grounded). Both differential analog in-
puts, 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
LTC2355-12/LTC2355-14 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
samplingcapacitor,chooseanamplifierthathasalowoutput
impedance(<100Ω)attheclosed-loopbandwidthfrequency.
For example, if an amplifier is used in a gain of 1 and has a
unity-gainbandwidthof50MHz,thentheoutputimpedanceat
50MHz must be less than 100Ω. The second requirement is
thattheclosed-loopbandwidthmustbegreaterthan40MHz
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 LTC2355-12/
LTC2355-14 will depend on the application. Generally, ap-
plications fall into two categories: 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 LTC2355-12/LTC2355-14. (More
applications inFormation
detailed information is available in the Linear Technology
Databooks and on the LinearView CD-ROM.)
LTC1566-1: Low Noise 2.3MHz Continuous Time Low-
Pass Filter.
LT1630: 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 1kΩ, VS = 5V), making the part excellent for AC
applications(to1/3Nyquist)whererail-to-railperformance
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
applications with a single 5V supply. THD and noise are
–93dB to 40kHz and below 1LSB to 800kHz (AV = 1,
2VP-P into 1kΩ, VS = 5V), making the part excellent for
ACapplicationswhererail-to-railperformanceisdesired.
Quad version is available as LT1633.
LT1813: Dual 100MHz 750V/s 3mA Voltage Feedback
Amplifier.5Vto±5Vsupplies.Distortionis–86dBto100kHz
and –77dB to 1MHz with ±5V supplies (2VP-P into 500Ω).
Excellent part for fast AC applications with ±5V supplies.
LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/Amplifier,
8.5nV/√Hz.
LT1806/LT1807:325MHzGBWP,–80dBcDistortionat5MHz,Uni-
ty-Gain Stable, R-R In and Out, 10mA/Amplifier, 3.5nV/√Hz.
LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplifier, 16nV/√Hz.
LT1818/LT1819: 400MHz, 2500V/s,9mA, Single/Dual
Voltage 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.
LinearView is a trademark of Linear Technology Corporation.
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