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| 型号： | LTC2356IMSE-14#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 3.5MSPS 10-MSOP |
| 标准包装： | 50 |
| 位数： | 14 |
| 采样率（每秒）： | 3.5M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 18mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
| 产品目录页面： | 1349 (CN2011-ZH PDF) |
| 配用： | DC1082A-E-ND - BOARD SAR ADC LTC2356-14 |
LTC2356-12/LTC2356-14
11
2356fb
DRIVING THE ANALOG INPUT
ThedifferentialanaloginputsoftheLTC2356-12/LTC2356-14
may be driven differentially or as a single-ended input (i.e.,
theAIN–inputissettoVCM).Bothdifferentialanaloginputs,
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 rejec-
tion 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
samplingcapacitor,chooseanamplifierthathasalowoutput
impedance(<100Ω)attheclosed-loopbandwidthfrequency.
For example, if an amplifier is used with 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 LTC2356-12/
LTC2356-14 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 LTC2356-12/LTC2356-14. (More
APPLICATIONS INFORMATION
detailed information is available in the Linear Technology
Databooks and our website at www.linear.com.)
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 (to 1/3 Nyquist) where rail-to-rail perfor-
mance 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: 325MHz GBWP, –80dBc Distortion at
5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Ampli-
fier, 3.5nV/√Hz.
LT1810:180MHzGBWP,–90dBcDistortionat5MHz,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.
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